Messages in this thread | | | Date | Fri, 24 Mar 2023 17:44:45 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH] x86/microcode: move @microcode_mutex definition near usage |
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On Fri, Mar 24, 2023 at 05:39:35PM +0106, John Ogness wrote: > Note that an unused mutex is being defined, even when the compiler is > not warning about it.
Are you sure?
$ make arch/x86/kernel/cpu/microcode/core.s grep microcode_mutex arch/x86/kernel/cpu/microcode/core.s $ $ make CC=clang arch/x86/kernel/cpu/microcode/core.s $ grep microcode_mutex arch/x86/kernel/cpu/microcode/core.s $
Looks to me like it gets optimized away.
> OK, but the kernel test robots will probably beat me to it. ;-)
That's exactly the question: they haven't because this is not a new situation. Their compilers are optimizing unused stuff away too.
:-)
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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