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linux-next/arch/parisc/Makefile
Mark Rutland a1326b17ac module/ftrace: handle patchable-function-entry 
When using patchable-function-entry, the compiler will record the
callsites into a section named "__patchable_function_entries" rather
than "__mcount_loc". Let's abstract this difference behind a new
FTRACE_CALLSITE_SECTION, so that architectures don't have to handle this
explicitly (e.g. with custom module linker scripts).

As parisc currently handles this explicitly, it is fixed up accordingly,
with its custom linker script removed. Since FTRACE_CALLSITE_SECTION is
only defined when DYNAMIC_FTRACE is selected, the parisc module loading
code is updated to only use the definition in that case. When
DYNAMIC_FTRACE is not selected, modules shouldn't have this section, so
this removes some redundant work in that case.

To make sure that this is keep up-to-date for modules and the main
kernel, a comment is added to vmlinux.lds.h, with the existing ifdeffery
simplified for legibility.

I built parisc generic-{32,64}bit_defconfig with DYNAMIC_FTRACE enabled,
and verified that the section made it into the .ko files for modules.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Helge Deller <deller@gmx.de>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Torsten Duwe <duwe@suse.de>
Tested-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Tested-by: Sven Schnelle <svens@stackframe.org>
Tested-by: Torsten Duwe <duwe@suse.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: linux-parisc@vger.kernel.org
2019-11-06 14:17:30 +00:00

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Makefile
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#
# parisc/Makefile
#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies. Remember to do have actions
# for "archclean" and "archdep" for cleaning up and making dependencies for
# this architecture
#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1994 by Linus Torvalds
# Portions Copyright (C) 1999 The Puffin Group
#
# Modified for PA-RISC Linux by Paul Lahaie, Alex deVries,
# Mike Shaver, Helge Deller and Martin K. Petersen
#
KBUILD_IMAGE := vmlinuz
NM = sh $(srctree)/arch/parisc/nm
CHECKFLAGS += -D__hppa__=1
LIBGCC = $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
export LIBGCC
ifdef CONFIG_64BIT
UTS_MACHINE := parisc64
CHECKFLAGS += -D__LP64__=1
CC_ARCHES = hppa64
LD_BFD := elf64-hppa-linux
else # 32-bit
CC_ARCHES = hppa hppa2.0 hppa1.1
LD_BFD := elf32-hppa-linux
endif
export LD_BFD
ifneq ($(SUBARCH),$(UTS_MACHINE))
ifeq ($(CROSS_COMPILE),)
CC_SUFFIXES = linux linux-gnu unknown-linux-gnu
CROSS_COMPILE := $(call cc-cross-prefix, \
$(foreach a,$(CC_ARCHES), \
$(foreach s,$(CC_SUFFIXES),$(a)-$(s)-)))
endif
endif
ifdef CONFIG_DYNAMIC_FTRACE
ifdef CONFIG_64BIT
NOP_COUNT := 8
else
NOP_COUNT := 5
endif
export CC_USING_RECORD_MCOUNT:=1
export CC_USING_PATCHABLE_FUNCTION_ENTRY:=1
KBUILD_AFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY=1
KBUILD_CFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY=1 \
-DFTRACE_PATCHABLE_FUNCTION_SIZE=$(NOP_COUNT)
CC_FLAGS_FTRACE := -fpatchable-function-entry=$(NOP_COUNT),$(shell echo $$(($(NOP_COUNT)-1)))
endif
OBJCOPY_FLAGS =-O binary -R .note -R .comment -S
cflags-y := -pipe
# These flags should be implied by an hppa-linux configuration, but they
# are not in gcc 3.2.
cflags-y += -mno-space-regs
# -mfast-indirect-calls is only relevant for 32-bit kernels.
ifndef CONFIG_64BIT
cflags-y += -mfast-indirect-calls
endif
# Currently we save and restore fpregs on all kernel entry/interruption paths.
# If that gets optimized, we might need to disable the use of fpregs in the
# kernel.
cflags-y += -mdisable-fpregs
# Use long jumps instead of long branches (needed if your linker fails to
# link a too big vmlinux executable). Not enabled for building modules.
ifdef CONFIG_MLONGCALLS
KBUILD_CFLAGS_KERNEL += -mlong-calls
endif
# Without this, "ld -r" results in .text sections that are too big (> 0x40000)
# for branches to reach stubs. And multiple .text sections trigger a warning
# when creating the sysfs module information section.
ifndef CONFIG_64BIT
KBUILD_CFLAGS_MODULE += -ffunction-sections
endif
# select which processor to optimise for
cflags-$(CONFIG_PA7000) += -march=1.1 -mschedule=7100
cflags-$(CONFIG_PA7200) += -march=1.1 -mschedule=7200
cflags-$(CONFIG_PA7100LC) += -march=1.1 -mschedule=7100LC
cflags-$(CONFIG_PA7300LC) += -march=1.1 -mschedule=7300
cflags-$(CONFIG_PA8X00) += -march=2.0 -mschedule=8000
head-y := arch/parisc/kernel/head.o
KBUILD_CFLAGS += $(cflags-y)
kernel-y := mm/ kernel/ math-emu/
core-y += $(addprefix arch/parisc/, $(kernel-y))
libs-y += arch/parisc/lib/ $(LIBGCC)
drivers-$(CONFIG_OPROFILE) += arch/parisc/oprofile/
boot := arch/parisc/boot
PALO := $(shell if (which palo 2>&1); then : ; \
elif [ -x /sbin/palo ]; then echo /sbin/palo; \
fi)
PALOCONF := $(shell if [ -f $(srctree)/palo.conf ]; then echo $(srctree)/palo.conf; \
else echo $(objtree)/palo.conf; \
fi)
palo lifimage: vmlinuz
@if test ! -x "$(PALO)"; then \
echo 'ERROR: Please install palo first (apt-get install palo)';\
echo 'or build it from source and install it somewhere in your $$PATH';\
false; \
fi
@if test ! -f "$(PALOCONF)"; then \
cp $(srctree)/arch/parisc/defpalo.conf $(objtree)/palo.conf; \
echo 'A generic palo config file ($(objree)/palo.conf) has been created for you.'; \
echo 'You should check it and re-run "make palo".'; \
echo 'WARNING: the "lifimage" file is now placed in this directory by default!'; \
false; \
fi
$(PALO) -f $(PALOCONF)
BOOT_TARGETS = zImage Image palo lifimage
INSTALL_TARGETS = zinstall install
PHONY += bzImage $(BOOT_TARGETS) $(INSTALL_TARGETS)
# Default kernel to build
all: bzImage
zImage: vmlinuz
Image: vmlinux
bzImage: vmlinux
$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
ifdef CONFIG_PARISC_SELF_EXTRACT
vmlinuz: bzImage
$(OBJCOPY) $(boot)/bzImage $@
else
vmlinuz: vmlinux
@gzip -cf -9 $< > $@
endif
install:
$(CONFIG_SHELL) $(srctree)/arch/parisc/install.sh \
$(KERNELRELEASE) vmlinux System.map "$(INSTALL_PATH)"
zinstall:
$(CONFIG_SHELL) $(srctree)/arch/parisc/install.sh \
$(KERNELRELEASE) vmlinuz System.map "$(INSTALL_PATH)"
CLEAN_FILES += lifimage
MRPROPER_FILES += palo.conf
define archhelp
@echo '* vmlinux - Uncompressed kernel image (./vmlinux)'
@echo ' vmlinuz - Compressed kernel image (./vmlinuz)'
@echo ' palo - Bootable image (./lifimage)'
@echo ' install - Install uncompressed vmlinux kernel using'
@echo ' (your) ~/bin/$(INSTALLKERNEL) or'
@echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
@echo ' copy to $$(INSTALL_PATH)'
@echo ' zinstall - Install compressed vmlinuz kernel'
endef
archclean:
$(Q)$(MAKE) $(clean)=$(boot)
archheaders:
$(Q)$(MAKE) $(build)=arch/parisc/kernel/syscalls all
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