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Kbuild updates for v6.5

Browse Source 
- Remove the deprecated rule to build *.dtbo from *.dts
 
  - Refactor section mismatch detection in modpost
 
  - Fix bogus ARM section mismatch detections
 
  - Fix error of 'make gtags' with O= option
 
  - Add Clang's target triple to KBUILD_CPPFLAGS to fix a build error with
    the latest LLVM version
 
  - Rebuild the built-in initrd when KBUILD_BUILD_TIMESTAMP is changed
 
  - Ignore more compiler-generated symbols for kallsyms
 
  - Fix 'make local*config' to handle the ${CONFIG_FOO} form in Makefiles
 
  - Enable more kernel-doc warnings with W=2
 
  - Refactor <linux/export.h> by generating KSYMTAB data by modpost
 
  - Deprecate <asm/export.h> and <asm-generic/export.h>
 
  - Remove the EXPORT_DATA_SYMBOL macro
 
  - Move the check for static EXPORT_SYMBOL back to modpost, which makes
    the build faster
 
  - Re-implement CONFIG_TRIM_UNUSED_KSYMS with one-pass algorithm
 
  - Warn missing MODULE_DESCRIPTION when building modules with W=1
 
  - Make 'make clean' robust against too long argument error
 
  - Exclude more objects from GCOV to fix CFI failures with GCOV
 
  - Allow 'make modules_install' to install modules.builtin and
    modules.builtin.modinfo even when CONFIG_MODULES is disabled
 
  - Include modules.builtin and modules.builtin.modinfo in the linux-image
    Debian package even when CONFIG_MODULES is disabled
 
  - Revive "Entering directory" logging for the latest Make version
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Merge tag 'kbuild-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

 - Remove the deprecated rule to build *.dtbo from *.dts

 - Refactor section mismatch detection in modpost

 - Fix bogus ARM section mismatch detections

 - Fix error of 'make gtags' with O= option

 - Add Clang's target triple to KBUILD_CPPFLAGS to fix a build error
   with the latest LLVM version

 - Rebuild the built-in initrd when KBUILD_BUILD_TIMESTAMP is changed

 - Ignore more compiler-generated symbols for kallsyms

 - Fix 'make local*config' to handle the ${CONFIG_FOO} form in Makefiles

 - Enable more kernel-doc warnings with W=2

 - Refactor <linux/export.h> by generating KSYMTAB data by modpost

 - Deprecate <asm/export.h> and <asm-generic/export.h>

 - Remove the EXPORT_DATA_SYMBOL macro

 - Move the check for static EXPORT_SYMBOL back to modpost, which makes
   the build faster

 - Re-implement CONFIG_TRIM_UNUSED_KSYMS with one-pass algorithm

 - Warn missing MODULE_DESCRIPTION when building modules with W=1

 - Make 'make clean' robust against too long argument error

 - Exclude more objects from GCOV to fix CFI failures with GCOV

 - Allow 'make modules_install' to install modules.builtin and
   modules.builtin.modinfo even when CONFIG_MODULES is disabled

 - Include modules.builtin and modules.builtin.modinfo in the
   linux-image Debian package even when CONFIG_MODULES is disabled

 - Revive "Entering directory" logging for the latest Make version

* tag 'kbuild-v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (72 commits)
  modpost: define more R_ARM_* for old distributions
  kbuild: revive "Entering directory" for Make >= 4.4.1
  kbuild: set correct abs_srctree and abs_objtree for package builds
  scripts/mksysmap: Ignore prefixed KCFI symbols
  kbuild: deb-pkg: remove the CONFIG_MODULES check in buildeb
  kbuild: builddeb: always make modules_install, to install modules.builtin*
  modpost: continue even with unknown relocation type
  modpost: factor out Elf_Sym pointer calculation to section_rel()
  modpost: factor out inst location calculation to section_rel()
  kbuild: Disable GCOV for *.mod.o
  kbuild: Fix CFI failures with GCOV
  kbuild: make clean rule robust against too long argument error
  script: modpost: emit a warning when the description is missing
  kbuild: make modules_install copy modules.builtin(.modinfo)
  linux/export.h: rename 'sec' argument to 'license'
  modpost: show offset from symbol for section mismatch warnings
  modpost: merge two similar section mismatch warnings
  kbuild: implement CONFIG_TRIM_UNUSED_KSYMS without recursion
  modpost: use null string instead of NULL pointer for default namespace
  modpost: squash sym_update_namespace() into sym_add_exported()
  ...
This commit is contained in:
Linus Torvalds 2023-07-01 09:24:31 -07:00
commit ad2885979e
44 changed files with 673 additions and 1009 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
.gitignore vendored
View File

@ -51,7 +51,6 @@
*.symversions
*.tab.[ch]
*.tar
*.usyms
*.xz
*.zst
Module.symvers
@ -112,7 +111,6 @@ modules.order
#
/include/config/
/include/generated/
/include/ksym/
/arch/*/include/generated/
# stgit generated dirs

6
Documentation/kbuild/kbuild.rst
View File

@ -150,6 +150,12 @@ the UTS_MACHINE variable, and on some architectures also the kernel config.
The value of KBUILD_DEBARCH is assumed (not checked) to be a valid Debian
architecture.
KDOCFLAGS
---------
Specify extra (warning/error) flags for kernel-doc checks during the build,
see scripts/kernel-doc for which flags are supported. Note that this doesn't
(currently) apply to documentation builds.
ARCH
----
Set ARCH to the architecture to be built.

14
Documentation/process/changes.rst
View File

@ -60,6 +60,8 @@ openssl & libcrypto 1.0.0 openssl version
bc 1.06.95 bc --version
Sphinx\ [#f1]_ 1.7 sphinx-build --version
cpio any cpio --version
GNU tar 1.28 tar --version
gtags (optional) 6.6.5 gtags --version
====================== =============== ========================================
.. [#f1] Sphinx is needed only to build the Kernel documentation
@ -174,6 +176,18 @@ You will need openssl to build kernels 3.7 and higher if module signing is
enabled. You will also need openssl development packages to build kernels 4.3
and higher.
Tar
---
GNU tar is needed if you want to enable access to the kernel headers via sysfs
(CONFIG_IKHEADERS).
gtags / GNU GLOBAL (optional)
-----------------------------
The kernel build requires GNU GLOBAL version 6.6.5 or later to generate
tag files through ``make gtags``. This is due to its use of the gtags
``-C (--directory)`` flag.
System utilities
****************

94
Makefile
View File

@ -38,6 +38,10 @@ __all:
# descending is started. They are now explicitly listed as the
# prepare rule.
this-makefile := $(lastword $(MAKEFILE_LIST))
export abs_srctree := $(realpath $(dir $(this-makefile)))
export abs_objtree := $(CURDIR)
ifneq ($(sub_make_done),1)
# Do not use make's built-in rules and variables
@ -185,20 +189,8 @@ $(if $(abs_objtree),, \
# $(realpath ...) resolves symlinks
abs_objtree := $(realpath $(abs_objtree))
else
abs_objtree := $(CURDIR)
endif # ifneq ($(KBUILD_OUTPUT),)
ifeq ($(abs_objtree),$(CURDIR))
# Suppress "Entering directory ..." unless we are changing the work directory.
MAKEFLAGS += --no-print-directory
else
need-sub-make := 1
endif
this-makefile := $(lastword $(MAKEFILE_LIST))
abs_srctree := $(realpath $(dir $(this-makefile)))
ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
endif
@ -211,9 +203,25 @@ need-sub-make := 1
$(this-makefile): ;
endif
export abs_srctree abs_objtree
export sub_make_done := 1
endif # sub_make_done
ifeq ($(abs_objtree),$(CURDIR))
# Suppress "Entering directory ..." if we are at the final work directory.
no-print-directory := --no-print-directory
else
# Recursion to show "Entering directory ..."
need-sub-make := 1
endif
ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
# If --no-print-directory is unset, recurse once again to set it.
# You may end up recursing into __sub-make twice. This is needed due to the
# behavior change in GNU Make 4.4.1.
need-sub-make := 1
endif
ifeq ($(need-sub-make),1)
PHONY += $(MAKECMDGOALS) __sub-make
@ -223,18 +231,12 @@ $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
# Invoke a second make in the output directory, passing relevant variables
__sub-make:
$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
$(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
-f $(abs_srctree)/Makefile $(MAKECMDGOALS)
endif # need-sub-make
endif # sub_make_done
else # need-sub-make
# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(need-sub-make),)
# Do not print "Entering directory ...",
# but we want to display it when entering to the output directory
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory
ifeq ($(abs_srctree),$(abs_objtree))
# building in the source tree
@ -1199,28 +1201,12 @@ endif
export KBUILD_VMLINUX_LIBS
export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
# Recurse until adjust_autoksyms.sh is satisfied
PHONY += autoksyms_recursive
ifdef CONFIG_TRIM_UNUSED_KSYMS
# For the kernel to actually contain only the needed exported symbols,
# we have to build modules as well to determine what those symbols are.
# (this can be evaluated only once include/config/auto.conf has been included)
KBUILD_MODULES := 1
autoksyms_recursive: $(build-dir) modules.order
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
"$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
endif
autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
quiet_cmd_autoksyms_h = GEN $@
cmd_autoksyms_h = mkdir -p $(dir $@); \
$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
$(autoksyms_h):
$(call cmd,autoksyms_h)
# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
quiet_cmd_ar_vmlinux.a = AR $@
cmd_ar_vmlinux.a = \
@ -1229,7 +1215,7 @@ quiet_cmd_ar_vmlinux.a = AR $@
$(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
targets += vmlinux.a
vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
$(call if_changed,ar_vmlinux.a)
PHONY += vmlinux_o
@ -1285,7 +1271,7 @@ scripts: scripts_basic scripts_dtc
PHONY += prepare archprepare
archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
asm-generic $(version_h) include/generated/utsrelease.h \
include/generated/compile.h include/generated/autoconf.h remove-stale-files
prepare0: archprepare
@ -1567,6 +1553,8 @@ modules_sign_only := y
endif
endif
endif # CONFIG_MODULES
modinst_pre :=
ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
modinst_pre := __modinst_pre
@ -1577,18 +1565,18 @@ PHONY += __modinst_pre
__modinst_pre:
@rm -rf $(MODLIB)/kernel
@rm -f $(MODLIB)/source
@mkdir -p $(MODLIB)/kernel
@mkdir -p $(MODLIB)
ifdef CONFIG_MODULES
@ln -s $(abspath $(srctree)) $(MODLIB)/source
@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
rm -f $(MODLIB)/build ; \
ln -s $(CURDIR) $(MODLIB)/build ; \
fi
@sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
endif
@cp -f modules.builtin $(MODLIB)/
@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
endif # CONFIG_MODULES
###
# Cleaning is done on three levels.
# make clean Delete most generated files
@ -1930,6 +1918,13 @@ help:
@echo ' clean - remove generated files in module directory only'
@echo ''
__external_modules_error:
@echo >&2 '***'
@echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
@echo >&2 '*** You cannot build or install external modules.'
@echo >&2 '***'
@false
endif # KBUILD_EXTMOD
# ---------------------------------------------------------------------------
@ -1966,13 +1961,10 @@ else # CONFIG_MODULES
# Modules not configured
# ---------------------------------------------------------------------------
modules modules_install:
@echo >&2 '***'
@echo >&2 '*** The present kernel configuration has modules disabled.'
@echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
@echo >&2 '*** to enable CONFIG_MODULES.'
@echo >&2 '***'
@exit 1
PHONY += __external_modules_error
modules modules_install: __external_modules_error
@:
KBUILD_MODULES :=
@ -2045,7 +2037,7 @@ clean: $(clean-dirs)
-o -name '*.dtb.S' -o -name '*.dtbo.S' \
-o -name '*.dt.yaml' \
-o -name '*.dwo' -o -name '*.lst' \
-o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
-o -name '*.su' -o -name '*.mod' \
-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
-o -name '*.lex.c' -o -name '*.tab.[ch]' \
-o -name '*.asn1.[ch]' \

8
arch/arc/include/asm/linkage.h
View File

@ -8,6 +8,10 @@
#include <asm/dwarf.h>
#define ASM_NL ` /* use '`' to mark new line in macro */
#define __ALIGN .align 4
#define __ALIGN_STR __stringify(__ALIGN)
#ifdef __ASSEMBLY__
.macro ST2 e, o, off
@ -28,10 +32,6 @@
#endif
.endm
#define ASM_NL ` /* use '`' to mark new line in macro */
#define __ALIGN .align 4
#define __ALIGN_STR __stringify(__ALIGN)
/* annotation for data we want in DCCM - if enabled in .config */
.macro ARCFP_DATA nm
#ifdef CONFIG_ARC_HAS_DCCM

1
arch/ia64/include/asm/Kbuild
View File

@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
generated-y += syscall_table.h
generic-y += agp.h
generic-y += export.h
generic-y += kvm_para.h
generic-y += mcs_spinlock.h
generic-y += vtime.h

3
arch/ia64/include/asm/export.h
View File

@ -1,3 +0,0 @@
/* EXPORT_DATA_SYMBOL != EXPORT_SYMBOL here */
#define KSYM_FUNC(name) @fptr(name)
#include <asm-generic/export.h>

2
arch/ia64/kernel/head.S
View File

@ -170,7 +170,7 @@ RestRR: \
__PAGE_ALIGNED_DATA
.global empty_zero_page
EXPORT_DATA_SYMBOL_GPL(empty_zero_page)
EXPORT_SYMBOL_GPL(empty_zero_page)
empty_zero_page:
.skip PAGE_SIZE

2
arch/ia64/kernel/ivt.S
View File

@ -87,7 +87,7 @@
.align 32768 // align on 32KB boundary
.global ia64_ivt
EXPORT_DATA_SYMBOL(ia64_ivt)
EXPORT_SYMBOL(ia64_ivt)
ia64_ivt:
/////////////////////////////////////////////////////////////////////////////////////////
// 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)

2
arch/mips/Makefile
View File

@ -346,7 +346,7 @@ KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
KBUILD_LDFLAGS += -m $(ld-emul)
ifdef CONFIG_MIPS
CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
CHECKFLAGS += $(shell $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
grep -E -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
endif

2
arch/powerpc/kernel/vdso/Makefile
View File

@ -54,7 +54,7 @@ KASAN_SANITIZE := n
KCSAN_SANITIZE := n
ccflags-y := -fno-common -fno-builtin
ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack
ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack $(CLANG_FLAGS)
ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld)
ldflags-$(CONFIG_LD_ORPHAN_WARN) += -Wl,--orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)

7
arch/um/os-Linux/user_syms.c
View File

@ -37,13 +37,6 @@ EXPORT_SYMBOL(vsyscall_ehdr);
EXPORT_SYMBOL(vsyscall_end);
#endif
/* Export symbols used by GCC for the stack protector. */
extern void __stack_smash_handler(void *) __attribute__((weak));
EXPORT_SYMBOL(__stack_smash_handler);
extern long __guard __attribute__((weak));
EXPORT_SYMBOL(__guard);
#ifdef _FORTIFY_SOURCE
extern int __sprintf_chk(char *str, int flag, size_t len, const char *format);
EXPORT_SYMBOL(__sprintf_chk);

83
include/asm-generic/export.h
View File

@ -3,86 +3,9 @@
#define __ASM_GENERIC_EXPORT_H
/*
* This comment block is used by fixdep. Please do not remove.
*
* When CONFIG_MODVERSIONS is changed from n to y, all source files having
* EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
* side effect of the *.o build rule.
* <asm/export.h> and <asm-generic/export.h> are deprecated.
* Please include <linux/export.h> directly.
*/
#ifndef KSYM_FUNC
#define KSYM_FUNC(x) x
#endif
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
#define KSYM_ALIGN 4
#elif defined(CONFIG_64BIT)
#define KSYM_ALIGN 8
#else
#define KSYM_ALIGN 4
#endif
.macro __put, val, name
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
.long \val - ., \name - ., 0
#elif defined(CONFIG_64BIT)
.quad \val, \name, 0
#else
.long \val, \name, 0
#endif
.endm
/*
* note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
* section flag requires it. Use '%progbits' instead of '@progbits' since the
* former apparently works on all arches according to the binutils source.
*/
.macro ___EXPORT_SYMBOL name,val,sec
#if defined(CONFIG_MODULES) && !defined(__DISABLE_EXPORTS)
.section ___ksymtab\sec+\name,"a"
.balign KSYM_ALIGN
__ksymtab_\name:
__put \val, __kstrtab_\name
.previous
.section __ksymtab_strings,"aMS",%progbits,1
__kstrtab_\name:
.asciz "\name"
.previous
#endif
.endm
#if defined(CONFIG_TRIM_UNUSED_KSYMS)
#include <linux/kconfig.h>
#include <generated/autoksyms.h>
.macro __ksym_marker sym
.section ".discard.ksym","a"
__ksym_marker_\sym:
.previous
.endm
#define __EXPORT_SYMBOL(sym, val, sec) \
__ksym_marker sym; \
__cond_export_sym(sym, val, sec, __is_defined(__KSYM_##sym))
#define __cond_export_sym(sym, val, sec, conf) \
___cond_export_sym(sym, val, sec, conf)
#define ___cond_export_sym(sym, val, sec, enabled) \
__cond_export_sym_##enabled(sym, val, sec)
#define __cond_export_sym_1(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
#define __cond_export_sym_0(sym, val, sec) /* nothing */
#else
#define __EXPORT_SYMBOL(sym, val, sec) ___EXPORT_SYMBOL sym, val, sec
#endif
#define EXPORT_SYMBOL(name) \
__EXPORT_SYMBOL(name, KSYM_FUNC(name),)
#define EXPORT_SYMBOL_GPL(name) \
__EXPORT_SYMBOL(name, KSYM_FUNC(name), _gpl)
#define EXPORT_DATA_SYMBOL(name) \
__EXPORT_SYMBOL(name, name,)
#define EXPORT_DATA_SYMBOL_GPL(name) \
__EXPORT_SYMBOL(name, name,_gpl)
#include <linux/export.h>
#endif

1
include/asm-generic/vmlinux.lds.h
View File

@ -1016,6 +1016,7 @@
PATCHABLE_DISCARDS \
*(.discard) \
*(.discard.*) \
*(.export_symbol) \
*(.modinfo) \
/* ld.bfd warns about .gnu.version* even when not emitted */ \
*(.gnu.version*) \

49
include/linux/export-internal.h
View File

@ -10,6 +10,55 @@
#include <linux/compiler.h>
#include <linux/types.h>
#if defined(CONFIG_HAVE_ARCH_PREL32_RELOCATIONS)
/*
* relative reference: this reduces the size by half on 64-bit architectures,
* and eliminates the need for absolute relocations that require runtime
* processing on relocatable kernels.
*/
#define __KSYM_REF(sym) ".long " #sym "- ."
#elif defined(CONFIG_64BIT)
#define __KSYM_REF(sym) ".quad " #sym
#else
#define __KSYM_REF(sym) ".long " #sym
#endif
/*
* For every exported symbol, do the following:
*
* - Put the name of the symbol and namespace (empty string "" for none) in
* __ksymtab_strings.
* - Place a struct kernel_symbol entry in the __ksymtab section.
*
* Note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
* section flag requires it. Use '%progbits' instead of '@progbits' since the
* former apparently works on all arches according to the binutils source.
*/
#define __KSYMTAB(name, sym, sec, ns) \
asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1" "\n" \
"__kstrtab_" #name ":" "\n" \
" .asciz \"" #name "\"" "\n" \
"__kstrtabns_" #name ":" "\n" \
" .asciz \"" ns "\"" "\n" \
" .previous" "\n" \
" .section \"___ksymtab" sec "+" #name "\", \"a\"" "\n" \
" .balign 4" "\n" \
"__ksymtab_" #name ":" "\n" \
__KSYM_REF(sym) "\n" \
__KSYM_REF(__kstrtab_ ##name) "\n" \
__KSYM_REF(__kstrtabns_ ##name) "\n" \
" .previous" "\n" \
)
#ifdef CONFIG_IA64
#define KSYM_FUNC(name) @fptr(name)
#else
#define KSYM_FUNC(name) name
#endif
#define KSYMTAB_FUNC(name, sec, ns) __KSYMTAB(name, KSYM_FUNC(name), sec, ns)
#define KSYMTAB_DATA(name, sec, ns) __KSYMTAB(name, name, sec, ns)
#define SYMBOL_CRC(sym, crc, sec) \
asm(".section \"___kcrctab" sec "+" #sym "\",\"a\"" "\n" \
"__crc_" #sym ":" "\n" \

128
include/linux/export.h
View File

@ -2,6 +2,8 @@
#ifndef _LINUX_EXPORT_H
#define _LINUX_EXPORT_H
#include <linux/compiler.h>
#include <linux/linkage.h>
#include <linux/stringify.h>
/*
@ -28,74 +30,25 @@ extern struct module __this_module;
#else
#define THIS_MODULE ((struct module *)0)
#endif
#endif /* __ASSEMBLY__ */
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
#include <linux/compiler.h>
/*
* Emit the ksymtab entry as a pair of relative references: this reduces
* the size by half on 64-bit architectures, and eliminates the need for
* absolute relocations that require runtime processing on relocatable
* kernels.
*/
#define __KSYMTAB_ENTRY(sym, sec) \
__ADDRESSABLE(sym) \
asm(" .section \"___ksymtab" sec "+" #sym "\", \"a\" \n" \
" .balign 4 \n" \
"__ksymtab_" #sym ": \n" \
" .long " #sym "- . \n" \
" .long __kstrtab_" #sym "- . \n" \
" .long __kstrtabns_" #sym "- . \n" \
" .previous \n")
struct kernel_symbol {
int value_offset;
int name_offset;
int namespace_offset;
};
#ifdef CONFIG_64BIT
#define __EXPORT_SYMBOL_REF(sym) \
.balign 8 ASM_NL \
.quad sym
#else
#define __KSYMTAB_ENTRY(sym, sec) \
static const struct kernel_symbol __ksymtab_##sym \
__attribute__((section("___ksymtab" sec "+" #sym), used)) \
__aligned(sizeof(void *)) \
= { (unsigned long)&sym, __kstrtab_##sym, __kstrtabns_##sym }
struct kernel_symbol {
unsigned long value;
const char *name;
const char *namespace;
};
#define __EXPORT_SYMBOL_REF(sym) \
.balign 4 ASM_NL \
.long sym
#endif
#ifdef __GENKSYMS__
#define ___EXPORT_SYMBOL(sym, sec, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
#else
/*
* For every exported symbol, do the following:
*
* - Put the name of the symbol and namespace (empty string "" for none) in
* __ksymtab_strings.
* - Place a struct kernel_symbol entry in the __ksymtab section.
*
* note on .section use: we specify progbits since usage of the "M" (SHF_MERGE)
* section flag requires it. Use '%progbits' instead of '@progbits' since the
* former apparently works on all arches according to the binutils source.
*/
#define ___EXPORT_SYMBOL(sym, sec, ns) \
extern typeof(sym) sym; \
extern const char __kstrtab_##sym[]; \
extern const char __kstrtabns_##sym[]; \
asm(" .section \"__ksymtab_strings\",\"aMS\",%progbits,1 \n" \
"__kstrtab_" #sym ": \n" \
" .asciz \"" #sym "\" \n" \
"__kstrtabns_" #sym ": \n" \
" .asciz \"" ns "\" \n" \
" .previous \n"); \
__KSYMTAB_ENTRY(sym, sec)
#endif
#define ___EXPORT_SYMBOL(sym, license, ns) \
.section ".export_symbol","a" ASM_NL \
__export_symbol_##sym: ASM_NL \
.asciz license ASM_NL \
.asciz ns ASM_NL \
__EXPORT_SYMBOL_REF(sym) ASM_NL \
.previous
#if !defined(CONFIG_MODULES) || defined(__DISABLE_EXPORTS)
@ -104,54 +57,35 @@ struct kernel_symbol {
* be reused in other execution contexts such as the UEFI stub or the
* decompressor.
*/
#define __EXPORT_SYMBOL(sym, sec, ns)
#define __EXPORT_SYMBOL(sym, license, ns)
#elif defined(CONFIG_TRIM_UNUSED_KSYMS)
#elif defined(__GENKSYMS__)
#include <generated/autoksyms.h>
#define __EXPORT_SYMBOL(sym, license, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
/*
* For fine grained build dependencies, we want to tell the build system
* about each possible exported symbol even if they're not actually exported.
* We use a symbol pattern __ksym_marker_<symbol> that the build system filters
* from the $(NM) output (see scripts/gen_ksymdeps.sh). These symbols are
* discarded in the final link stage.
*/
#define __ksym_marker(sym) \
static int __ksym_marker_##sym[0] __section(".discard.ksym") __used
#elif defined(__ASSEMBLY__)
#define __EXPORT_SYMBOL(sym, sec, ns) \
__ksym_marker(sym); \
__cond_export_sym(sym, sec, ns, __is_defined(__KSYM_##sym))
#define __cond_export_sym(sym, sec, ns, conf) \
___cond_export_sym(sym, sec, ns, conf)
#define ___cond_export_sym(sym, sec, ns, enabled) \
__cond_export_sym_##enabled(sym, sec, ns)
#define __cond_export_sym_1(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns)
#ifdef __GENKSYMS__
#define __cond_export_sym_0(sym, sec, ns) __GENKSYMS_EXPORT_SYMBOL(sym)
#else
#define __cond_export_sym_0(sym, sec, ns) /* nothing */
#endif
#define __EXPORT_SYMBOL(sym, license, ns) \
___EXPORT_SYMBOL(sym, license, ns)
#else
#define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns)
#define __EXPORT_SYMBOL(sym, license, ns) \
extern typeof(sym) sym; \
__ADDRESSABLE(sym) \
asm(__stringify(___EXPORT_SYMBOL(sym, license, ns)))
#endif /* CONFIG_MODULES */
#ifdef DEFAULT_SYMBOL_NAMESPACE
#define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, __stringify(DEFAULT_SYMBOL_NAMESPACE))
#define _EXPORT_SYMBOL(sym, license) __EXPORT_SYMBOL(sym, license, __stringify(DEFAULT_SYMBOL_NAMESPACE))
#else
#define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "")
#define _EXPORT_SYMBOL(sym, license) __EXPORT_SYMBOL(sym, license, "")
#endif
#define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "")
#define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "_gpl")
#define EXPORT_SYMBOL_GPL(sym) _EXPORT_SYMBOL(sym, "GPL")
#define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", __stringify(ns))
#define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "_gpl", __stringify(ns))
#endif /* !__ASSEMBLY__ */
#define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "GPL", __stringify(ns))
#endif /* _LINUX_EXPORT_H */

10
include/linux/pm.h
View File

@ -375,23 +375,23 @@ const struct dev_pm_ops name = { \
}
#ifdef CONFIG_PM
#define _EXPORT_DEV_PM_OPS(name, sec, ns) \
#define _EXPORT_DEV_PM_OPS(name, license, ns) \
const struct dev_pm_ops name; \
__EXPORT_SYMBOL(name, sec, ns); \
__EXPORT_SYMBOL(name, license, ns); \
const struct dev_pm_ops name
#define EXPORT_PM_FN_GPL(name) EXPORT_SYMBOL_GPL(name)
#define EXPORT_PM_FN_NS_GPL(name, ns) EXPORT_SYMBOL_NS_GPL(name, ns)
#else
#define _EXPORT_DEV_PM_OPS(name, sec, ns) \
#define _EXPORT_DEV_PM_OPS(name, license, ns) \
static __maybe_unused const struct dev_pm_ops __static_##name
#define EXPORT_PM_FN_GPL(name)
#define EXPORT_PM_FN_NS_GPL(name, ns)
#endif
#define EXPORT_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "", "")
#define EXPORT_GPL_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "_gpl", "")
#define EXPORT_GPL_DEV_PM_OPS(name) _EXPORT_DEV_PM_OPS(name, "GPL", "")
#define EXPORT_NS_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "", #ns)
#define EXPORT_NS_GPL_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "_gpl", #ns)
#define EXPORT_NS_GPL_DEV_PM_OPS(name, ns) _EXPORT_DEV_PM_OPS(name, "GPL", #ns)
/*
* Use this if you want to use the same suspend and resume callbacks for suspend

1
init/Makefile
View File

@ -60,3 +60,4 @@ include/generated/utsversion.h: FORCE
$(obj)/version-timestamp.o: include/generated/utsversion.h
CFLAGS_version-timestamp.o := -include include/generated/utsversion.h
KASAN_SANITIZE_version-timestamp.o := n
GCOV_PROFILE_version-timestamp.o := n

7
kernel/gen_kheaders.sh
View File

@ -83,12 +83,9 @@ find $cpio_dir -type f -print0 |
xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
# Create archive and try to normalize metadata for reproducibility.
# For compatibility with older versions of tar, files are fed to tar
# pre-sorted, as --sort=name might not be available.
find $cpio_dir -printf "./%P\n" | LC_ALL=C sort | \
tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
--owner=0 --group=0 --numeric-owner --no-recursion \
-I $XZ -cf $tarfile -C $cpio_dir/ -T - > /dev/null
--owner=0 --group=0 --sort=name --numeric-owner \
-I $XZ -cf $tarfile -C $cpio_dir/ . > /dev/null
echo $headers_md5 > kernel/kheaders.md5
echo "$this_file_md5" >> kernel/kheaders.md5

12
kernel/module/internal.h
View File

@ -32,6 +32,18 @@
/* Maximum number of characters written by module_flags() */
#define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
struct kernel_symbol {
#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
int value_offset;
int name_offset;
int namespace_offset;
#else
unsigned long value;
const char *name;
const char *namespace;
#endif
};
extern struct mutex module_mutex;
extern struct list_head modules;

31
scripts/Makefile.build
View File

@ -82,7 +82,7 @@ ifdef need-builtin
targets-for-builtin += $(obj)/built-in.a
endif
targets-for-modules := $(foreach x, o mod $(if $(CONFIG_TRIM_UNUSED_KSYMS), usyms), \
targets-for-modules := $(foreach x, o mod, \
$(patsubst %.o, %.$x, $(filter %.o, $(obj-m))))
ifdef need-modorder
@ -101,7 +101,9 @@ else ifeq ($(KBUILD_CHECKSRC),2)
endif
ifneq ($(KBUILD_EXTRA_WARN),)
cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $(KDOCFLAGS) \
$(if $(findstring 2, $(KBUILD_EXTRA_WARN)), -Wall) \
$<
endif
# Compile C sources (.c)
@ -161,7 +163,7 @@ quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
ifdef CONFIG_MODVERSIONS
# When module versioning is enabled the following steps are executed:
# o compile a <file>.o from <file>.c
# o if <file>.o doesn't contain a __ksymtab version, i.e. does
# o if <file>.o doesn't contain a __export_symbol_*, i.e. does
# not export symbols, it's done.
# o otherwise, we calculate symbol versions using the good old
# genksyms on the preprocessed source and dump them into the .cmd file.
@ -169,7 +171,7 @@ ifdef CONFIG_MODVERSIONS
# be compiled and linked to the kernel and/or modules.
gen_symversions = \
if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
if $(NM) $@ 2>/dev/null | grep -q ' __export_symbol_'; then \
$(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
>> $(dot-target).cmd; \
fi
@ -215,21 +217,12 @@ is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(basetar
$(obj)/%.o: objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y))
ifdef CONFIG_TRIM_UNUSED_KSYMS
cmd_gen_ksymdeps = \
$(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
endif
cmd_check_local_export = $(srctree)/scripts/check-local-export $@
ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))
endif
define rule_cc_o_c
$(call cmd_and_fixdep,cc_o_c)
$(call cmd,gen_ksymdeps)
$(call cmd,check_local_export)
$(call cmd,checksrc)
$(call cmd,checkdoc)
$(call cmd,gen_objtooldep)
@ -240,8 +233,6 @@ endef
define rule_as_o_S
$(call cmd_and_fixdep,as_o_S)
$(call cmd,gen_ksymdeps)
$(call cmd,check_local_export)
$(call cmd,gen_objtooldep)
$(call cmd,gen_symversions_S)
$(call cmd,warn_shared_object)
@ -260,12 +251,6 @@ cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \
$(obj)/%.mod: FORCE
$(call if_changed,mod)
# List module undefined symbols
cmd_undefined_syms = $(NM) $< | sed -n 's/^ *U //p' > $@
$(obj)/%.usyms: $(obj)/%.o FORCE
$(call if_changed,undefined_syms)
quiet_cmd_cc_lst_c = MKLST $@
cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
@ -340,9 +325,7 @@ $(obj)/%.ll: $(src)/%.rs FORCE
cmd_gensymtypes_S = \
{ echo "\#include <linux/kernel.h>" ; \
echo "\#include <asm/asm-prototypes.h>" ; \
$(CPP) $(a_flags) $< | \
grep "\<___EXPORT_SYMBOL\>" | \
sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
$(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/EXPORT_SYMBOL(\1);/p' ; } | \
$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@

3
scripts/Makefile.clang
View File

@ -35,6 +35,5 @@ CLANG_FLAGS += -Werror=unknown-warning-option
CLANG_FLAGS += -Werror=ignored-optimization-argument
CLANG_FLAGS += -Werror=option-ignored
CLANG_FLAGS += -Werror=unused-command-line-argument
KBUILD_CFLAGS += $(CLANG_FLAGS)
KBUILD_AFLAGS += $(CLANG_FLAGS)
KBUILD_CPPFLAGS += $(CLANG_FLAGS)
export CLANG_FLAGS

4
scripts/Makefile.clean
View File

@ -37,8 +37,10 @@ __clean-files := $(wildcard $(addprefix $(obj)/, $(__clean-files)))
# ==========================================================================
# To make this rule robust against "Argument list too long" error,
# remove $(obj)/ prefix, and restore it by a shell command.
quiet_cmd_clean = CLEAN $(obj)
cmd_clean = rm -rf $(__clean-files)
cmd_clean = printf '$(obj)/%s ' $(patsubst $(obj)/%,%,$(__clean-files)) | xargs rm -rf
__clean: $(subdir-ymn)
ifneq ($(strip $(__clean-files)),)

4
scripts/Makefile.compiler
View File

@ -32,13 +32,13 @@ try-run = $(shell set -e; \
# Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
as-option = $(call try-run,\
$(CC) -Werror $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2))
$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2))
# as-instr
# Usage: aflags-y += $(call as-instr,instr,option1,option2)
as-instr = $(call try-run,\
printf "%b\n" "$(1)" | $(CC) -Werror $(KBUILD_AFLAGS) -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3))
printf "%b\n" "$(1)" | $(CC) -Werror $(CLANG_FLAGS) $(KBUILD_AFLAGS) -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3))
# __cc-option
# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)

3
scripts/Makefile.lib
View File

@ -418,9 +418,6 @@ endif
$(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
$(call if_changed_dep,dtb)
$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
$(call if_changed_dep,dtc)
$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE
$(call if_changed_dep,dtc)

2
scripts/Makefile.modfinal
View File

@ -23,7 +23,7 @@ modname = $(notdir $(@:.mod.o=))
part-of-module = y
quiet_cmd_cc_o_c = CC [M] $@
cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI), $(c_flags)) -c -o $@ $<
cmd_cc_o_c = $(CC) $(filter-out $(CC_FLAGS_CFI) $(CFLAGS_GCOV), $(c_flags)) -c -o $@ $<
%.mod.o: %.mod.c FORCE
$(call if_changed_dep,cc_o_c)

8
scripts/Makefile.modpost
View File

@ -47,6 +47,7 @@ modpost-args = \
$(if $(KBUILD_MODPOST_WARN),-w) \
$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \
$(if $(findstring 1, $(KBUILD_EXTRA_WARN)),-W) \
-o $@
modpost-deps := $(MODPOST)
@ -90,6 +91,13 @@ targets += .vmlinux.objs
.vmlinux.objs: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
$(call if_changed,vmlinux_objs)
ifdef CONFIG_TRIM_UNUSED_KSYMS
ksym-wl := $(CONFIG_UNUSED_KSYMS_WHITELIST)
ksym-wl := $(if $(filter-out /%, $(ksym-wl)),$(srctree)/)$(ksym-wl)
modpost-args += -t $(addprefix -u , $(ksym-wl))
modpost-deps += $(ksym-wl)
endif
ifeq ($(wildcard vmlinux.o),)
missing-input := vmlinux.o
output-symdump := modules-only.symvers

1
scripts/Makefile.vmlinux
View File

@ -19,6 +19,7 @@ quiet_cmd_cc_o_c = CC $@
ifdef CONFIG_MODULES
KASAN_SANITIZE_.vmlinux.export.o := n
GCOV_PROFILE_.vmlinux.export.o := n
targets += .vmlinux.export.o
vmlinux: .vmlinux.export.o
endif

73
scripts/adjust_autoksyms.sh
View File

@ -1,73 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
# Script to update include/generated/autoksyms.h and dependency files
#
# Copyright: (C) 2016 Linaro Limited
# Created by: Nicolas Pitre, January 2016
#
# Update the include/generated/autoksyms.h file.
#
# For each symbol being added or removed, the corresponding dependency
# file's timestamp is updated to force a rebuild of the affected source
# file. All arguments passed to this script are assumed to be a command
# to be exec'd to trigger a rebuild of those files.
set -e
cur_ksyms_file="include/generated/autoksyms.h"
new_ksyms_file="include/generated/autoksyms.h.tmpnew"
info() {
if [ "$quiet" != "silent_" ]; then
printf " %-7s %s\n" "$1" "$2"
fi
}
info "CHK" "$cur_ksyms_file"
# Use "make V=1" to debug this script.
case "$KBUILD_VERBOSE" in
*1*)
set -x
;;
esac
# Generate a new symbol list file
$CONFIG_SHELL $srctree/scripts/gen_autoksyms.sh --modorder "$new_ksyms_file"
# Extract changes between old and new list and touch corresponding
# dependency files.
changed=$(
count=0
sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' |
while read sympath; do
if [ -z "$sympath" ]; then continue; fi
depfile="include/ksym/${sympath}"
mkdir -p "$(dirname "$depfile")"
touch "$depfile"
# Filesystems with coarse time precision may create timestamps
# equal to the one from a file that was very recently built and that
# needs to be rebuild. Let's guard against that by making sure our
# dep files are always newer than the first file we created here.
while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
touch "$depfile"
done
echo $((count += 1))
done | tail -1 )
changed=${changed:-0}
if [ $changed -gt 0 ]; then
# Replace the old list with tne new one
old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
info "UPD" "$cur_ksyms_file"
mv -f "$new_ksyms_file" "$cur_ksyms_file"
# Then trigger a rebuild of affected source files
exec $@
else
rm -f "$new_ksyms_file"
fi

3
scripts/basic/fixdep.c
View File

@ -246,8 +246,7 @@ static void *read_file(const char *filename)
/* Ignore certain dependencies */
static int is_ignored_file(const char *s, int len)
{
return str_ends_with(s, len, "include/generated/autoconf.h") ||
str_ends_with(s, len, "include/generated/autoksyms.h");
return str_ends_with(s, len, "include/generated/autoconf.h");
}
/* Do not parse these files */

70
scripts/check-local-export
View File

@ -1,70 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2022 Masahiro Yamada <masahiroy@kernel.org>
# Copyright (C) 2022 Owen Rafferty <owen@owenrafferty.com>
#
# Exit with error if a local exported symbol is found.
# EXPORT_SYMBOL should be used for global symbols.
set -e
pid=$$
# If there is no symbol in the object, ${NM} (both GNU nm and llvm-nm) shows
# 'no symbols' diagnostic (but exits with 0). It is harmless and hidden by
# '2>/dev/null'. However, it suppresses real error messages as well. Add a
# hand-crafted error message here.
#
# TODO:
# Use --quiet instead of 2>/dev/null when we upgrade the minimum version of
# binutils to 2.37, llvm to 13.0.0.
# Then, the following line will be simpler:
# { ${NM} --quiet ${1} || kill 0; } |
{ ${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; kill $pid; } } |
${AWK} -v "file=${1}" '
BEGIN {
i = 0
}
# Skip the line if the number of fields is less than 3.
#
# case 1)
# For undefined symbols, the first field (value) is empty.
# The outout looks like this:
# " U _printk"
# It is unneeded to record undefined symbols.
#
# case 2)
# For Clang LTO, llvm-nm outputs a line with type t but empty name:
# "---------------- t"
!length($3) {
next
}
# save (name, type) in the associative array
{ symbol_types[$3]=$2 }
# append the exported symbol to the array
($3 ~ /^__ksymtab_/) {
export_symbols[i] = $3
sub(/^__ksymtab_/, "", export_symbols[i])
i++
}
END {
exit_code = 0
for (j = 0; j < i; ++j) {
name = export_symbols[j]
# nm(3) says "If lowercase, the symbol is usually local"
if (symbol_types[name] ~ /[a-z]/) {
printf "%s: error: local symbol %s was exported\n",
file, name | "cat 1>&2"
exit_code = 1
}
}
exit exit_code
}'
exit $?

62
scripts/gen_autoksyms.sh
View File

@ -1,62 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-only
# Create an autoksyms.h header file from the list of all module's needed symbols
# as recorded in *.usyms files and the user-provided symbol whitelist.
set -e
# Use "make V=1" to debug this script.
case "$KBUILD_VERBOSE" in
*1*)
set -x
;;
esac
read_modorder=
if [ "$1" = --modorder ]; then
shift
read_modorder=1
fi
output_file="$1"
needed_symbols=
# Special case for modversions (see modpost.c)
if grep -q "^CONFIG_MODVERSIONS=y$" include/config/auto.conf; then
needed_symbols="$needed_symbols module_layout"
fi
ksym_wl=$(sed -n 's/^CONFIG_UNUSED_KSYMS_WHITELIST=\(.*\)$/\1/p' include/config/auto.conf)
if [ -n "$ksym_wl" ]; then
[ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
echo "ERROR: '$ksym_wl' whitelist file not found" >&2
exit 1
fi
fi
# Generate a new ksym list file with symbols needed by the current
# set of modules.
cat > "$output_file" << EOT
/*
* Automatically generated file; DO NOT EDIT.
*/
EOT
{
[ -n "${read_modorder}" ] && sed 's/o$/usyms/' modules.order | xargs cat
echo "$needed_symbols"
[ -n "$ksym_wl" ] && cat "$ksym_wl"
} | sed -e 's/ /\n/g' | sed -n -e '/^$/!p' |
# Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry
# point addresses.
sed -e 's/^\.//' |
sort -u |
# Ignore __this_module. It's not an exported symbol, and will be resolved
# when the final .ko's are linked.
grep -v '^__this_module$' |
sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"

30
scripts/gen_ksymdeps.sh
View File

@ -1,30 +0,0 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
set -e
# List of exported symbols
#
# If the object has no symbol, $NM warns 'no symbols'.
# Suppress the stderr.
# TODO:
# Use -q instead of 2>/dev/null when we upgrade the minimum version of
# binutils to 2.37, llvm to 13.0.0.
ksyms=$($NM $1 2>/dev/null | sed -n 's/.*__ksym_marker_\(.*\)/\1/p')
if [ -z "$ksyms" ]; then
exit 0
fi
echo
echo "ksymdeps_$1 := \\"
for s in $ksyms
do
printf ' $(wildcard include/ksym/%s) \\\n' "$s"
done
echo
echo "$1: \$(ksymdeps_$1)"
echo
echo "\$(ksymdeps_$1):"

63
scripts/kallsyms.c
View File

@ -19,6 +19,7 @@
*
*/
#include <errno.h>
#include <getopt.h>
#include <stdbool.h>
#include <stdio.h>
@ -29,24 +30,8 @@
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
#define _stringify_1(x) #x
#define _stringify(x) _stringify_1(x)
#define KSYM_NAME_LEN 512
/*
* A substantially bigger size than the current maximum.
*
* It cannot be defined as an expression because it gets stringified
* for the fscanf() format string. Therefore, a _Static_assert() is
* used instead to maintain the relationship with KSYM_NAME_LEN.
*/
#define KSYM_NAME_LEN_BUFFER 2048
_Static_assert(
KSYM_NAME_LEN_BUFFER == KSYM_NAME_LEN * 4,
"Please keep KSYM_NAME_LEN_BUFFER in sync with KSYM_NAME_LEN"
);
struct sym_entry {
unsigned long long addr;
unsigned int len;
@ -136,24 +121,40 @@ static void check_symbol_range(const char *sym, unsigned long long addr,
}
}
static struct sym_entry *read_symbol(FILE *in)
static struct sym_entry *read_symbol(FILE *in, char **buf, size_t *buf_len)
{
char name[KSYM_NAME_LEN_BUFFER+1], type;
char *name, type, *p;
unsigned long long addr;
unsigned int len;
size_t len;
ssize_t readlen;
struct sym_entry *sym;
int rc;
rc = fscanf(in, "%llx %c %" _stringify(KSYM_NAME_LEN_BUFFER) "s\n", &addr, &type, name);
if (rc != 3) {
if (rc != EOF && fgets(name, ARRAY_SIZE(name), in) == NULL)
fprintf(stderr, "Read error or end of file.\n");
readlen = getline(buf, buf_len, in);
if (readlen < 0) {
if (errno) {
perror("read_symbol");
exit(EXIT_FAILURE);
}
return NULL;
}
if (strlen(name) >= KSYM_NAME_LEN) {
if ((*buf)[readlen - 1] == '\n')
(*buf)[readlen - 1] = 0;
addr = strtoull(*buf, &p, 16);
if (*buf == p || *p++ != ' ' || !isascii((type = *p++)) || *p++ != ' ') {
fprintf(stderr, "line format error\n");
exit(EXIT_FAILURE);
}
name = p;
len = strlen(name);
if (len >= KSYM_NAME_LEN) {
fprintf(stderr, "Symbol %s too long for kallsyms (%zu >= %d).\n"
"Please increase KSYM_NAME_LEN both in kernel and kallsyms.c\n",
name, strlen(name), KSYM_NAME_LEN);
name, len, KSYM_NAME_LEN);
return NULL;
}
@ -169,8 +170,7 @@ static struct sym_entry *read_symbol(FILE *in)
/* include the type field in the symbol name, so that it gets
* compressed together */
len = strlen(name) + 1;
len++;
sym = malloc(sizeof(*sym) + len + 1);
if (!sym) {
@ -257,6 +257,8 @@ static void read_map(const char *in)
{
FILE *fp;
struct sym_entry *sym;
char *buf = NULL;
size_t buflen = 0;
fp = fopen(in, "r");
if (!fp) {
@ -265,7 +267,7 @@ static void read_map(const char *in)
}
while (!feof(fp)) {
sym = read_symbol(fp);
sym = read_symbol(fp, &buf, &buflen);
if (!sym)
continue;
@ -284,6 +286,7 @@ static void read_map(const char *in)
table[table_cnt++] = sym;
}
free(buf);
fclose(fp);
}
@ -806,7 +809,7 @@ static void record_relative_base(void)
int main(int argc, char **argv)
{
while (1) {
static struct option long_options[] = {
static const struct option long_options[] = {
{"all-symbols", no_argument, &all_symbols, 1},
{"absolute-percpu", no_argument, &absolute_percpu, 1},
{"base-relative", no_argument, &base_relative, 1},

2
scripts/kconfig/streamline_config.pl
View File

@ -317,7 +317,7 @@ foreach my $makefile (@makefiles) {
$_ = convert_vars($_, %make_vars);
# collect objects after obj-$(CONFIG_FOO_BAR)
if (/obj-\$\((CONFIG_[^\)]*)\)\s*[+:]?=\s*(.*)/) {
if (/obj-\$[({](CONFIG_[^})]*)[)}]\s*[+:]?=\s*(.*)/) {
$var = $1;
$objs = $2;

28
scripts/kernel-doc
View File

@ -23,7 +23,7 @@ kernel-doc - Print formatted kernel documentation to stdout
=head1 SYNOPSIS
kernel-doc [-h] [-v] [-Werror]
kernel-doc [-h] [-v] [-Werror] [-Wall] [-Wreturn] [-Wshort-description] [-Wcontents-before-sections]
[ -man |
-rst [-sphinx-version VERSION] [-enable-lineno] |
-none
@ -133,6 +133,9 @@ my $dohighlight = "";
my $verbose = 0;
my $Werror = 0;
my $Wreturn = 0;
my $Wshort_desc = 0;
my $Wcontents_before_sections = 0;
my $output_mode = "rst";
my $output_preformatted = 0;
my $no_doc_sections = 0;
@ -187,9 +190,14 @@ if (defined($ENV{'KCFLAGS'})) {
}
}
# reading this variable is for backwards compat just in case
# someone was calling it with the variable from outside the
# kernel's build system
if (defined($ENV{'KDOC_WERROR'})) {
$Werror = "$ENV{'KDOC_WERROR'}";
}
# other environment variables are converted to command-line
# arguments in cmd_checkdoc in the build system
# Generated docbook code is inserted in a template at a point where
# docbook v3.1 requires a non-zero sequence of RefEntry's; see:
@ -318,6 +326,16 @@ while ($ARGV[0] =~ m/^--?(.*)/) {
$verbose = 1;
} elsif ($cmd eq "Werror") {
$Werror = 1;
} elsif ($cmd eq "Wreturn") {
$Wreturn = 1;
} elsif ($cmd eq "Wshort-desc") {
$Wshort_desc = 1;
} elsif ($cmd eq "Wcontents-before-sections") {
$Wcontents_before_sections = 1;
} elsif ($cmd eq "Wall") {
$Wreturn = 1;
$Wshort_desc = 1;
$Wcontents_before_sections = 1;
} elsif (($cmd eq "h") || ($cmd eq "help")) {
pod2usage(-exitval => 0, -verbose => 2);
} elsif ($cmd eq 'no-doc-sections') {
@ -1748,9 +1766,9 @@ sub dump_function($$) {
# This check emits a lot of warnings at the moment, because many
# functions don't have a 'Return' doc section. So until the number
# of warnings goes sufficiently down, the check is only performed in
# verbose mode.
# -Wreturn mode.
# TODO: always perform the check.
if ($verbose && !$noret) {
if ($Wreturn && !$noret) {
check_return_section($file, $declaration_name, $return_type);
}
@ -2054,7 +2072,7 @@ sub process_name($$) {
$state = STATE_NORMAL;
}
if (($declaration_purpose eq "") && $verbose) {
if (($declaration_purpose eq "") && $Wshort_desc) {
emit_warning("${file}:$.", "missing initial short description on line:\n$_");
}
@ -2103,7 +2121,7 @@ sub process_body($$) {
}
if (($contents ne "") && ($contents ne "\n")) {
if (!$in_doc_sect && $verbose) {
if (!$in_doc_sect && $Wcontents_before_sections) {
emit_warning("${file}:$.", "contents before sections\n");
}
dump_section($file, $section, $contents);

10
scripts/mksysmap
View File

@ -32,7 +32,7 @@ ${NM} -n ${1} | sed >${2} -e "
# (do not forget a space before each pattern)
# local symbols for ARM, MIPS, etc.
/ \$/d
/ \\$/d
# local labels, .LBB, .Ltmpxxx, .L__unnamed_xx, .LASANPC, etc.
/ \.L/d
@ -40,8 +40,12 @@ ${NM} -n ${1} | sed >${2} -e "
# arm64 EFI stub namespace
/ __efistub_/d
# arm64 local symbols in PIE namespace
/ __pi_\\$/d
/ __pi_\.L/d
# arm64 local symbols in non-VHE KVM namespace
/ __kvm_nvhe_\$/d
/ __kvm_nvhe_\\$/d
/ __kvm_nvhe_\.L/d
# arm64 lld
@ -58,6 +62,8 @@ ${NM} -n ${1} | sed >${2} -e "
# CFI type identifiers
/ __kcfi_typeid_/d
/ __kvm_nvhe___kcfi_typeid_/d
/ __pi___kcfi_typeid_/d
# CRC from modversions
/ __crc_/d

805
scripts/mod/modpost.c
View File

File diff suppressed because it is too large Load Diff

6
scripts/mod/modpost.h
View File

@ -137,6 +137,7 @@ struct elf_info {
Elf_Shdr *sechdrs;
Elf_Sym *symtab_start;
Elf_Sym *symtab_stop;
unsigned int export_symbol_secndx; /* .export_symbol section */
char *strtab;
char *modinfo;
unsigned int modinfo_len;
@ -151,11 +152,6 @@ struct elf_info {
Elf32_Word *symtab_shndx_stop;
};
static inline int is_shndx_special(unsigned int i)
{
return i != SHN_XINDEX && i >= SHN_LORESERVE && i <= SHN_HIRESERVE;
}
/* Accessor for sym->st_shndx, hides ugliness of "64k sections" */
static inline unsigned int get_secindex(const struct elf_info *info,
const Elf_Sym *sym)

8
scripts/package/builddeb
View File

@ -62,18 +62,14 @@ install_linux_image () {
${MAKE} -f ${srctree}/Makefile INSTALL_DTBS_PATH="${pdir}/usr/lib/linux-image-${KERNELRELEASE}" dtbs_install
fi
if is_enabled CONFIG_MODULES; then
${MAKE} -f ${srctree}/Makefile INSTALL_MOD_PATH="${pdir}" modules_install
rm -f "${pdir}/lib/modules/${KERNELRELEASE}/build"
rm -f "${pdir}/lib/modules/${KERNELRELEASE}/source"
if [ "${SRCARCH}" = um ] ; then
mkdir -p "${pdir}/usr/lib/uml/modules"
mv "${pdir}/lib/modules/${KERNELRELEASE}" "${pdir}/usr/lib/uml/modules/${KERNELRELEASE}"
fi
fi
# Install the kernel
if [ "${ARCH}" = um ] ; then
mkdir -p "${pdir}/usr/lib/uml/modules"
mv "${pdir}/lib/modules/${KERNELRELEASE}" "${pdir}/usr/lib/uml/modules/${KERNELRELEASE}"
mkdir -p "${pdir}/usr/bin" "${pdir}/usr/share/doc/${pname}"
cp System.map "${pdir}/usr/lib/uml/modules/${KERNELRELEASE}/System.map"
cp ${KCONFIG_CONFIG} "${pdir}/usr/share/doc/${pname}/config"

4
scripts/remove-stale-files
View File

@ -33,3 +33,7 @@ rm -f rust/target.json
rm -f scripts/bin2c
rm -f .scmversion
rm -rf include/ksym
find . -name '*.usyms' | xargs rm -f

9
scripts/tags.sh
View File

@ -32,6 +32,13 @@ else
tree=${srctree}/
fi
# gtags(1) refuses to index any file outside of its current working dir.
# If gtags indexing is requested and the build output directory is not
# the kernel source tree, index all files in absolute-path form.
if [[ "$1" == "gtags" && -n "${tree}" ]]; then
tree=$(realpath "$tree")/
fi
# Detect if ALLSOURCE_ARCHS is set. If not, we assume SRCARCH
if [ "${ALLSOURCE_ARCHS}" = "" ]; then
ALLSOURCE_ARCHS=${SRCARCH}
@ -131,7 +138,7 @@ docscope()
dogtags()
{
all_target_sources | gtags -i -f -
all_target_sources | gtags -i -C "${tree:-.}" -f - "$PWD"
}
# Basic regular expressions with an optional /kind-spec/ for ctags and

1
usr/Makefile
View File

@ -64,6 +64,7 @@ quiet_cmd_initfs = GEN $@
$(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
$(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
$(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
$(if $(KBUILD_BUILD_TIMESTAMP), -d "$(KBUILD_BUILD_TIMESTAMP)") \
$(ramfs-input)
# We rebuild initramfs_data.cpio if:

16
usr/gen_initramfs.sh
View File

@ -23,6 +23,7 @@ $0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
-g <gid> Group ID to map to group ID 0 (root).
<gid> is only meaningful if <cpio_source> is a
directory. "squash" forces all files to gid 0.
-d <date> Use date for all file mtime values
<cpio_source> File list or directory for cpio archive.
If <cpio_source> is a .cpio file it will be used
as direct input to initramfs.
@ -190,6 +191,7 @@ prog=$0
root_uid=0
root_gid=0
dep_list=
timestamp=
cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)
output="/dev/stdout"
@ -218,6 +220,13 @@ while [ $# -gt 0 ]; do
[ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0)
shift
;;
"-d") # date for file mtimes
timestamp="$(date -d"$1" +%s || :)"
if test -n "$timestamp"; then
timestamp="-t $timestamp"
fi
shift
;;
"-h")
usage
exit 0
@ -237,11 +246,4 @@ done
# If output_file is set we will generate cpio archive
# we are careful to delete tmp files
timestamp=
if test -n "$KBUILD_BUILD_TIMESTAMP"; then
timestamp="$(date -d"$KBUILD_BUILD_TIMESTAMP" +%s || :)"
if test -n "$timestamp"; then
timestamp="-t $timestamp"
fi
fi
usr/gen_init_cpio $timestamp $cpio_list > $output