linux-kernel - Re: [PATCH] mm: cma: Use pr_err

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Date:   Thu, 11 Mar 2021 17:53:38 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>,
        akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: cma: Use pr_err_ratelimited for CMA warning

On 09.03.21 10:16, Baolin Wang wrote:
> If we did not reserve extra CMA memory, the log buffer can be
> easily filled up by CMA failure warning when the devices calling
> dmam_alloc_coherent() to alloc DMA memory. Thus we can use
> pr_err_ratelimited() instead to reduce the duplicate CMA warning.
> 
> Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> ---
>   mm/cma.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/cma.c b/mm/cma.c
> index 54eee21..d101bdb 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -500,8 +500,8 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
>   	}
>   
>   	if (ret && !no_warn) {
> -		pr_err("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n",
> -		       __func__, cma->name, count, ret);
> +		pr_err_ratelimited("%s: %s: alloc failed, req-size: %zu pages, ret: %d\n",
> +				   __func__, cma->name, count, ret);
>   		cma_debug_show_areas(cma);
>   	}
>   
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb