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

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Date:   Thu, 26 Oct 2023 00:12:57 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     "wuqiang.matt" <wuqiang.matt@...edance.com>
Cc:     Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        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 Wed, 25 Oct 2023 19:26:37 +0800
"wuqiang.matt" <wuqiang.matt@...edance.com> wrote:

> 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.

Thanks Wuqiang, I found how I can fix that from your message.

> 
> 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 ?

No, maybe it depends on the arch that which __generic function need to use.

Thank you,

> 
> >   #endif /* __ASM_SH_CMPXCHG_H */
> > 
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>