linux-kernel - Re: [PATCH 20/23] mm: percpu: remove unnecessary unlikely()

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Message-ID: <20180831015854.GA69977@dennisz-mbp.dhcp.thefacebook.com>
Date:   Thu, 30 Aug 2018 21:58:55 -0400
From:   Dennis Zhou <dennisszhou@...il.com>
To:     Igor Stoppa <igor.stoppa@...il.com>
Cc:     linux-kernel@...r.kernel.org, Igor Stoppa <igor.stoppa@...wei.com>,
        zijun_hu <zijun_hu@....com>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>
Subject: Re: [PATCH 20/23] mm: percpu: remove unnecessary unlikely()

On Fri, Aug 31, 2018 at 01:34:26AM +0300, Igor Stoppa wrote:
> WARN_ON() already contains an unlikely(), so it's not necessary to
> wrap it into another.
> 
> Signed-off-by: Igor Stoppa <igor.stoppa@...wei.com>
> Cc: zijun_hu <zijun_hu@....com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Christoph Lameter <cl@...ux.com>
> Cc: Dennis Zhou <dennisszhou@...il.com>
> ---
>  mm/percpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/percpu.c b/mm/percpu.c
> index a749d4d96e3e..f5c2796fe63e 100644
> --- a/mm/percpu.c
> +++ b/mm/percpu.c
> @@ -2588,7 +2588,7 @@ int __init pcpu_page_first_chunk(size_t reserved_size,
>  	BUG_ON(ai->nr_groups != 1);
>  	upa = ai->alloc_size/ai->unit_size;
>  	nr_g0_units = roundup(num_possible_cpus(), upa);
> -	if (unlikely(WARN_ON(ai->groups[0].nr_units != nr_g0_units))) {
> +	if (WARN_ON(ai->groups[0].nr_units != nr_g0_units)) {
>  		pcpu_free_alloc_info(ai);
>  		return -EINVAL;
>  	}
> -- 
> 2.17.1
> 

Acked-by: Dennis Zhou <dennisszhou@...il.com>

Thanks,
Dennis