mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-08 03:24:08 +08:00
b5722a457b
This file contains symbol values, and was originally linked into
vmlinux, but I have no idea what it was actually used for.
Since the following commit:
827880ec26 ("x86/um: thin archives build fix")
it is not even linked. Now it is completely orphan, and no problem has
been reported. It is a proof that this file was not needed in the
first place.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Richard Weinberger <richard@nod.at>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-um@lists.infradead.org
Link: http://lkml.kernel.org/r/1530582614-5173-2-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
79 lines
2.1 KiB
Makefile
79 lines
2.1 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# Building vDSO images for x86.
|
|
#
|
|
|
|
# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
|
|
KCOV_INSTRUMENT := n
|
|
|
|
VDSO64-y := y
|
|
|
|
vdso-install-$(VDSO64-y) += vdso.so
|
|
|
|
|
|
# files to link into the vdso
|
|
vobjs-y := vdso-note.o um_vdso.o
|
|
|
|
# files to link into kernel
|
|
obj-$(VDSO64-y) += vdso.o vma.o
|
|
|
|
vobjs := $(foreach F,$(vobjs-y),$(obj)/$F)
|
|
|
|
$(obj)/vdso.o: $(obj)/vdso.so
|
|
|
|
targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y)
|
|
|
|
CPPFLAGS_vdso.lds += -P -C
|
|
|
|
VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \
|
|
-Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
|
|
|
|
$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so
|
|
|
|
$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE
|
|
$(call if_changed,vdso)
|
|
|
|
$(obj)/%.so: OBJCOPYFLAGS := -S
|
|
$(obj)/%.so: $(obj)/%.so.dbg FORCE
|
|
$(call if_changed,objcopy)
|
|
|
|
#
|
|
# Don't omit frame pointers for ease of userspace debugging, but do
|
|
# optimize sibling calls.
|
|
#
|
|
CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
|
|
$(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \
|
|
-fno-omit-frame-pointer -foptimize-sibling-calls
|
|
|
|
$(vobjs): KBUILD_CFLAGS += $(CFL)
|
|
|
|
#
|
|
# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
|
|
#
|
|
CFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage
|
|
CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage
|
|
|
|
#
|
|
# The DSO images are built using a special linker script.
|
|
#
|
|
quiet_cmd_vdso = VDSO $@
|
|
cmd_vdso = $(CC) -nostdlib -o $@ \
|
|
$(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
|
|
-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
|
|
sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'
|
|
|
|
VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
|
|
GCOV_PROFILE := n
|
|
|
|
#
|
|
# Install the unstripped copy of vdso*.so listed in $(vdso-install-y).
|
|
#
|
|
quiet_cmd_vdso_install = INSTALL $@
|
|
cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
|
|
$(vdso-install-y): %.so: $(obj)/%.so.dbg FORCE
|
|
@mkdir -p $(MODLIB)/vdso
|
|
$(call cmd,vdso_install)
|
|
|
|
PHONY += vdso_install $(vdso-install-y)
|
|
vdso_install: $(vdso-install-y)
|