linux-kernel - Re: [PATCH cmpxchg 12/14] sh: Emulate one-byte cmpxchg

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Date: Thu, 18 Apr 2024 10:04:55 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org, elver@...gle.com, 
	akpm@...ux-foundation.org, tglx@...utronix.de, peterz@...radead.org, 
	dianders@...omium.org, pmladek@...e.com, torvalds@...ux-foundation.org, 
	Arnd Bergmann <arnd@...db.de>, Andi Shyti <andi.shyti@...ux.intel.com>, 
	Palmer Dabbelt <palmer@...osinc.com>, Masami Hiramatsu <mhiramat@...nel.org>, linux-sh@...r.kernel.org
Subject: Re: [PATCH cmpxchg 12/14] sh: Emulate one-byte cmpxchg

Hi Paul,

On Mon, Apr 8, 2024 at 7:50 PM Paul E. McKenney <paulmck@...nel.org> wrote:
> Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on sh.
>
> [ paulmck: Drop two-byte support per Arnd Bergmann feedback. ]
>
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>

Thanks for your patch!

> --- a/arch/sh/include/asm/cmpxchg.h
> +++ b/arch/sh/include/asm/cmpxchg.h
> @@ -56,6 +56,8 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
>                 unsigned long new, int size)
>  {
>         switch (size) {
> +       case 1:
> +               return cmpxchg_emu_u8((volatile u8 *)ptr, old, new);

The cast is not needed.

>         case 4:
>                 return __cmpxchg_u32(ptr, old, new);
>         }

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds