linux-kernel - Re: [PATCH v2 1/2] percpu: Add __this_cpu_try

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Date: Tue, 28 May 2024 20:50:20 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: Uros Bizjak <ubizjak@...il.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Uladzislau Rezki <urezki@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH v2 1/2] percpu: Add __this_cpu_try_cmpxchg()

On Tue, May 28, 2024 at 04:43:13PM +0200, Uros Bizjak wrote:
> Add __this_cpu_try_cmpxchg() version of the percpu op.
> 
> Signed-off-by: Uros Bizjak <ubizjak@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Uladzislau Rezki <urezki@...il.com>
> Cc: Christoph Hellwig <hch@...radead.org>
> Cc: Lorenzo Stoakes <lstoakes@...il.com>
> Cc: Dennis Zhou <dennis@...nel.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Christoph Lameter <cl@...ux.com>
> ---
>  include/linux/percpu-defs.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
> index ec3573119923..8efce7414fad 100644
> --- a/include/linux/percpu-defs.h
> +++ b/include/linux/percpu-defs.h
> @@ -475,6 +475,12 @@ do {									\
>  	raw_cpu_cmpxchg(pcp, oval, nval);				\
>  })
>  
> +#define __this_cpu_try_cmpxchg(pcp, ovalp, nval)			\
> +({									\
> +	__this_cpu_preempt_check("try_cmpxchg");			\
> +	raw_cpu_try_cmpxchg(pcp, ovalp, nval);				\
> +})
> +
>  #define __this_cpu_sub(pcp, val)	__this_cpu_add(pcp, -(typeof(pcp))(val))
>  #define __this_cpu_inc(pcp)		__this_cpu_add(pcp, 1)
>  #define __this_cpu_dec(pcp)		__this_cpu_sub(pcp, 1)
> -- 
> 2.42.0
> 
Acked-by: Uladzislau Rezki (Sony) <urezki@...il.com>

Thanks!

--
Uladzislau Rezki