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

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Message-Id: <ce2251ef49e1727a9a40531d1996660b05462bd2.1615279825.git.baolin.wang@linux.alibaba.com>
Date:   Tue,  9 Mar 2021 17:16:06 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org
Cc:     baolin.wang@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm: cma: Use pr_err_ratelimited for CMA warning

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);
 	}
 
-- 
1.8.3.1