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objtool: Make noinstr hacks optional

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Objtool has some hacks in place to workaround toolchain limitations
which otherwise would break no-instrumentation rules.  Make the hacks
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/b326eeb9c33231b9dfbb925f194ed7ee40edcd7c.1650300597.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf
2022-04-18 09:50:40 -07:00
committed by Peter Zijlstra
parent 4ab7674f59
commit 22102f4559
9 changed files with 23 additions and 6 deletions
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4
scripts/link-vmlinux.sh
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@@ -121,6 +121,10 @@ objtool_link()
objtoolopt="${objtoolopt} --hacks=jump_label"
fi
if is_enabled CONFIG_HAVE_NOINSTR_HACK; then
objtoolopt="${objtoolopt} --hacks=noinstr"
fi
if is_enabled CONFIG_X86_KERNEL_IBT; then
objtoolopt="${objtoolopt} --ibt"
fi