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authorJosh Poimboeuf <jpoimboe@redhat.com>2019-07-17 20:36:57 -0500
committerThomas Gleixner <tglx@linutronix.de>2019-07-18 21:01:10 +0200
commitb68b9907069a8d3a65bc16a35360bf8f8603c8fa (patch)
treeca8c51c1d05a67376139dd523809d6d84d8ccf57 /arch
parent9fe7b7642fe2c5158904d06fe31b740ca0695a01 (diff)
objtool: Support conditional retpolines
A Clang-built kernel is showing the following warning: arch/x86/kernel/platform-quirks.o: warning: objtool: x86_early_init_platform_quirks()+0x84: unreachable instruction That corresponds to this code: 7e: 0f 85 00 00 00 00 jne 84 <x86_early_init_platform_quirks+0x84> 80: R_X86_64_PC32 __x86_indirect_thunk_r11-0x4 84: c3 retq This is a conditional retpoline sibling call, which is now possible thanks to retpolines. Objtool hasn't seen that before. It's incorrectly interpreting the conditional jump as an unconditional dynamic jump. Reported-by: Nick Desaulniers <ndesaulniers@google.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/30d4c758b267ef487fb97e6ecb2f148ad007b554.1563413318.git.jpoimboe@redhat.com
Diffstat (limited to 'arch')
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