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authorMasahiro Yamada <masahiroy@kernel.org>2022-09-25 03:19:15 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2022-10-02 18:06:03 +0900
commitce697ccee1a8661da4e23fbe5f3d45d8d6922c20 (patch)
tree3e4a66982f38b33d4c17b13a04161eb764bf6220 /Makefile
parent3216484550610470013b7ce1c9ed272da0a74589 (diff)
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kbuild: remove head-y syntax
Kbuild puts the objects listed in head-y at the head of vmlinux. Conventionally, we do this for head*.S, which contains the kernel entry point. A counter approach is to control the section order by the linker script. Actually, the code marked as __HEAD goes into the ".head.text" section, which is placed before the normal ".text" section. I do not know if both of them are needed. From the build system perspective, head-y is not mandatory. If you can achieve the proper code placement by the linker script only, it would be cleaner. I collected the current head-y objects into head-object-list.txt. It is a whitelist. My hope is it will be reduced in the long run. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 8da45f76ec31..e4186c171049 100644
--- a/Makefile
+++ b/Makefile
@@ -1147,10 +1147,10 @@ quiet_cmd_ar_vmlinux.a = AR $@
cmd_ar_vmlinux.a = \
rm -f $@; \
$(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
- $(AR) mPiT $$($(AR) t $@ | head -n1) $@ $(head-y)
+ $(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -F --file=$(srctree)/scripts/head-object-list.txt)
targets += vmlinux.a
-vmlinux.a: $(KBUILD_VMLINUX_OBJS) autoksyms_recursive FORCE
+vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE
$(call if_changed,ar_vmlinux.a)
vmlinux.o: vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE