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

Joonsoo Kim
2014-06-16T05:40:49Z

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>

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 */
--
1.7.9.5