Re: [PATCH] x86/sev: Mark snp_abort() noreturn

Peter Zijlstra
2022-08-24T15:38:48Z

On Wed, Aug 24, 2022 at 05:24:20PM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
>
> Mark both the function prototype and definition as noreturn in order to
> prevent the compiler from doing transformations which confuse objtool
> like so:
>
> vmlinux.o: warning: objtool: sme_enable+0x71: unreachable instruction
>
> This triggers with gcc-12.

You'll probably also have to add it to the
objtool/check.c:global_noreturn[] list, for the case where objtool fails
to recognise it as noreturn.