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(parent: bf9a7f6) | patch
x86/bugs: Do IBPB fallback check only once
authorJosh Poimboeuf <jpoimboe@kernel.org>
Tue, 14 Jun 2022 22:07:19 +0000 (15:07 -0700)
committerBorislav Petkov <bp@suse.de>
Mon, 27 Jun 2022 08:34:00 +0000 (10:34 +0200)
commit895a5c18e0079ed65b9baea0610f4f705a8f2aa7
tree7b2532b4d57abff89e5fd5203ee8743df6dd3aeatree | snapshot
parentbf9a7f6cdeaabc5e0555a1ffd7fcf78c0588d8eccommit | diff
x86/bugs: Do IBPB fallback check only once

When booting with retbleed=auto, if the kernel wasn't built with
CONFIG_CC_HAS_RETURN_THUNK, the mitigation falls back to IBPB.  Make
sure a warning is printed in that case.  The IBPB fallback check is done
twice, but it really only needs to be done once.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
arch/x86/kernel/cpu/bugs.c diff | blob | history
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