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objtool: Make jump label hack optional

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Objtool secretly does a jump label hack to overcome the limitations of
the toolchain.  Make the hack explicit (and optional for other arches)
by turning it into a cmdline option and kernel config option.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/3bdcbfdd27ecb01ddec13c04bdf756a583b13d24.1650300597.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf
2022-04-18 09:50:39 -07:00
committed by Peter Zijlstra
parent 26e176896a
commit 4ab7674f59
8 changed files with 44 additions and 12 deletions
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4
scripts/link-vmlinux.sh
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@@ -117,6 +117,10 @@ objtool_link()
# Don't perform vmlinux validation unless explicitly requested,
# but run objtool on vmlinux.o now that we have an object file.
if is_enabled CONFIG_HAVE_JUMP_LABEL_HACK; then
objtoolopt="${objtoolopt} --hacks=jump_label"
fi
if is_enabled CONFIG_X86_KERNEL_IBT; then
objtoolopt="${objtoolopt} --ibt"
fi