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

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Message-ID: <560f1066-cefa-2ed9-e4f6-992096e11fda@bytedance.com>
Date:   Wed, 25 Oct 2023 19:26:37 +0800
From:   "wuqiang.matt" <wuqiang.matt@...edance.com>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Cc:     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: [External] [PATCH] locking/atomic: sh: Use generic_cmpxchg_local
 for arch_cmpxchg_local()

On 2023/10/24 22:52, 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 |    2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h
> index 288f6f38d98f..e920e61fb817 100644
> --- a/arch/sh/include/asm/cmpxchg.h
> +++ b/arch/sh/include/asm/cmpxchg.h
> @@ -71,4 +71,6 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
>   				    (unsigned long)_n_, sizeof(*(ptr))); \
>     })
>   
> +#include <asm-generic/cmpxchg-local.h>
> +

asm-generic/cmpxchg-local.h defines only 2 routines: __generic_cmpxchg_local
and __generic_cmpxchg64_local.

Shall add the definition of arch_cmpxchg_local into 
arch/sh/include/asm/cmpxchg.h, or group arch_cmpxchg_local and 
arch_cmpxchg64_local into
asm-generic/cmpxchg-local.h ?

>   #endif /* __ASM_SH_CMPXCHG_H */
>