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Message-ID: <CAKwvOd=sDbV-aKvroQTdOvW6C32TW20fr4xT0S4-E=fKeS=aWg@mail.gmail.com>
Date: Fri, 19 Aug 2022 11:45:54 -0700
From: Nick Desaulniers <ndesaulniers@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-um@...ts.infradead.org,
kvm@...r.kernel.org, llvm@...ts.linux.dev,
Linus Torvalds <torvalds@...ux-foundation.org>,
Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: Re: [PATCH] Kconfig: eradicate CC_HAS_ASM_GOTO
On Fri, Aug 19, 2022 at 10:01 AM Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
>
> diff --git a/arch/x86/include/asm/rmwcc.h b/arch/x86/include/asm/rmwcc.h
> index 8a9eba191516..c82f1b334207 100644
> --- a/arch/x86/include/asm/rmwcc.h
> +++ b/arch/x86/include/asm/rmwcc.h
> @@ -11,9 +11,7 @@
>
> #define __CLOBBERS_MEM(clb...) "memory", ## clb
>
> -#if !defined(__GCC_ASM_FLAG_OUTPUTS__) && defined(CONFIG_CC_HAS_ASM_GOTO)
> -
> -/* Use asm goto */
> +#ifndef __GCC_ASM_FLAG_OUTPUTS__
>
> #define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \
> ({ \
> @@ -27,21 +25,6 @@ cc_label: c = true; \
> c; \
> })
>
> -#else /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CONFIG_CC_HAS_ASM_GOTO) */
> -
> -/* Use flags output or a set instruction */
> -
> -#define __GEN_RMWcc(fullop, _var, cc, clobbers, ...) \
> -({ \
> - bool c; \
> - asm volatile (fullop CC_SET(cc) \
> - : [var] "+m" (_var), CC_OUT(cc) (c) \
> - : __VA_ARGS__ : clobbers); \
> - c; \
> -})
> -
> -#endif /* defined(__GCC_ASM_FLAG_OUTPUTS__) || !defined(CONFIG_CC_HAS_ASM_GOTO) */
> -
^ probably don't want to remove the terminal endif. Will respin based
on feedback from Masahiro + Alexei.
--
Thanks,
~Nick Desaulniers
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