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x86/extable: Annotate ex_handler_msr_mce() as a dead end

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Fix

  vmlinux.o: warning: objtool: fixup_exception+0x2d6: unreachable instruction

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220520192729.23969-1-bp@alien8.de
This commit is contained in:
Borislav Petkov 2022-05-20 21:27:29 +02:00 committed by Peter Zijlstra
parent 620f8d3bd3
commit 2028a255f4
2 changed files with 7 additions and 2 deletions
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8
arch/x86/include/asm/extable.h
View File

@ -42,9 +42,13 @@ extern int ex_get_fixup_type(unsigned long ip);
extern void early_fixup_exception(struct pt_regs *regs, int trapnr);
#ifdef CONFIG_X86_MCE
extern void ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr);
extern void __noreturn ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr);
#else
static inline void ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr) { }
static inline void __noreturn ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr)
{
for (;;)
cpu_relax();
}
#endif
#if defined(CONFIG_BPF_JIT) && defined(CONFIG_X86_64)

1
tools/objtool/check.c
View File

@ -187,6 +187,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"__invalid_creds",
"cpu_startup_entry",
"__ubsan_handle_builtin_unreachable",
"ex_handler_msr_mce",
};
if (!func)