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- Remove relocation information from vmlinux as it is not needed by

Browse source 
other tooling and thus a slimmer binary is generated. This is
   important for distros who have to distribute vmlinux blobs with their
   kernel packages too and that extraneous unnecessary data bloats them
   for no good reason
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Merge tag 'x86_build_for_v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 build update from Borislav Petkov:

 - Remove relocation information from vmlinux as it is not needed by
   other tooling and thus a slimmer binary is generated.

   This is important for distros who have to distribute vmlinux blobs
   with their kernel packages too and that extraneous unnecessary data
   bloats them for no good reason

* tag 'x86_build_for_v6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/build: Avoid relocation information in final vmlinux
This commit is contained in:
Linus Torvalds 2023-06-26 15:25:07 -07:00
commit 59035135b3
2 changed files with 50 additions and 5 deletions
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47
arch/x86/Makefile.postlink Normal file
View file

@ -0,0 +1,47 @@
# SPDX-License-Identifier: GPL-2.0
# ===========================================================================
# Post-link x86 pass
# ===========================================================================
#
# 1. Separate relocations from vmlinux into vmlinux.relocs.
# 2. Strip relocations from vmlinux.
PHONY := __archpost
__archpost:
-include include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
CMD_RELOCS = arch/x86/tools/relocs
OUT_RELOCS = arch/x86/boot/compressed
quiet_cmd_relocs = RELOCS $(OUT_RELOCS)/$@.relocs
cmd_relocs = \
mkdir -p $(OUT_RELOCS); \
$(CMD_RELOCS) $@ > $(OUT_RELOCS)/$@.relocs; \
$(CMD_RELOCS) --abs-relocs $@
quiet_cmd_strip_relocs = RSTRIP $@
cmd_strip_relocs = \
$(OBJCOPY) --remove-section='.rel.*' --remove-section='.rel__*' \
--remove-section='.rela.*' --remove-section='.rela__*' $@
# `@true` prevents complaint when there is nothing to be done
vmlinux: FORCE
@true
ifeq ($(CONFIG_X86_NEED_RELOCS),y)
$(call cmd,relocs)
$(call cmd,strip_relocs)
endif
%.ko: FORCE
@true
clean:
@rm -f $(OUT_RELOCS)/vmlinux.relocs
PHONY += FORCE clean
FORCE:
.PHONY: $(PHONY)

8
arch/x86/boot/compressed/Makefile
View file

@ -121,11 +121,9 @@ $(obj)/vmlinux.bin: vmlinux FORCE
targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs
CMD_RELOCS = arch/x86/tools/relocs
quiet_cmd_relocs = RELOCS $@
cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
$(obj)/vmlinux.relocs: vmlinux FORCE
$(call if_changed,relocs)
# vmlinux.relocs is created by the vmlinux postlink step.
$(obj)/vmlinux.relocs: vmlinux
@true
vmlinux.bin.all-y := $(obj)/vmlinux.bin
vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs