linux-kernel - Re: [PATCH v2] locking/atomic: sh: Use generic_cmpxchg_local for arch_cmpxchg

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Date:   Thu, 02 Nov 2023 09:58:21 +0100
From:   John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     "wuqiang . matt" <wuqiang.matt@...edance.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v2] locking/atomic: sh: Use generic_cmpxchg_local for
 arch_cmpxchg_local()

On Thu, 2023-10-26 at 00:10 +0900, Masami Hiramatsu (Google) wrote:
> From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Use __generic_cmpxchg_local() for arch_cmpxchg_local() implementation
> in SH architecture because it does not implement arch_cmpxchg_local().
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202310241310.Ir5uukOG-lkp@intel.com/
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> ---
>  arch/sh/include/asm/cmpxchg.h |    9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h
> index 288f6f38d98f..5d617b3ef78f 100644
> --- a/arch/sh/include/asm/cmpxchg.h
> +++ b/arch/sh/include/asm/cmpxchg.h
> @@ -71,4 +71,13 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
>  				    (unsigned long)_n_, sizeof(*(ptr))); \
>    })
>  
> +#include <asm-generic/cmpxchg-local.h>
> +
> +#define arch_cmpxchg_local(ptr, o, n) ({				\
> +	(__typeof__(*ptr))__generic_cmpxchg_local((ptr),		\
> +						  (unsigned long)(o),	\
> +						  (unsigned long)(n),	\
> +						  sizeof(*(ptr)));	\
> +})
> +
>  #endif /* __ASM_SH_CMPXCHG_H */

Reviewed-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

-- 
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