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[v3,-next,7/9] mm, CMA: clean-up CMA allocation error path

Message ID 1402897251-23639-8-git-send-email-iamjoonsoo.kim@lge.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Joonsoo Kim June 16, 2014, 5:40 a.m. UTC 
We can remove one call sites for clear_cma_bitmap() if we first
call it before checking error number.

Acked-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Michal Nazarewicz <mina86@mina86.com>
Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
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Patch

diff --git a/mm/cma.c b/mm/cma.c
index 0cf50da..b442a13 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -285,11 +285,12 @@  struct page *cma_alloc(struct cma *cma, int count, unsigned int align)
 		if (ret == 0) {
 			page = pfn_to_page(pfn);
 			break;
-		} else if (ret != -EBUSY) {
-			cma_clear_bitmap(cma, pfn, count);
-			break;
 		}
+
 		cma_clear_bitmap(cma, pfn, count);
+		if (ret != -EBUSY)
+			break;
+
 		pr_debug("%s(): memory range at %p is busy, retrying\n",
 			 __func__, pfn_to_page(pfn));
 		/* try again with a bit different memory target */