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FROMLIST: x86/boot: allow a relocatable kernel to be linked with lld

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LLD by default disallows relocations in read-only segments. For a
relocatable kernel, we pass -z notext to the linker to explicitly
allow relocations. This behavior is the default for BFD.

Link: https://github.com/ClangBuiltLinux/linux/issues/579
Signed-off-by: Dmitry Golovin <dima@golovin.in>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
[adelva: ndesaulniers notes this is a simpler alternative to the
         upstream fix that is hard to backport to 5.4 due to many
         x86 assembler changes]
Link: https://lore.kernel.org/lkml/20200501084215.242-1-dima@golovin.in/
Bug: 65987925
Signed-off-by: Alistair Delva <adelva@google.com>
Change-Id: Ie0085504ff58e468ad5b3f71014b58151b2f2f2d
This commit is contained in:
Dmitry Golovin 2020-05-01 08:42:13 +00:00 committed by Michael Bestas
parent ea14bd8d07
commit e81ce4fb88
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3
arch/x86/boot/compressed/Makefile
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@ -57,6 +57,9 @@ else
KBUILD_LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \
&& echo "-z noreloc-overflow -pie --no-dynamic-linker")
endif
ifeq ($(CONFIG_RELOCATABLE), y)
KBUILD_LDFLAGS += -z notext
endif
LDFLAGS_vmlinux := -T
hostprogs-y := mkpiggy