From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> Subject: 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. Link: https://lkml.kernel.org/r/ce2251ef49e1727a9a40531d1996660b05462bd2.1615279825.git.baolin.wang@xxxxxxxxxxxxxxxxx Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> Acked-by: Minchan Kim <minchan@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/cma.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/mm/cma.c~mm-cma-use-pr_err_ratelimited-for-cma-warning +++ a/mm/cma.c @@ -500,8 +500,8 @@ struct page *cma_alloc(struct cma *cma, } 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); } _
