linux-kernel - [PATCH v2 08/10] mm, cma: clean-up cma allocation error path

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Date:	Thu, 12 Jun 2014 12:21:45 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>
Cc:	Minchan Kim <minchan@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Gleb Natapov <gleb@...nel.org>, Alexander Graf <agraf@...e.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v2 08/10] mm, cma: clean-up cma allocation error path

We can remove one call sites for clear_cma_bitmap() if we first
call it before checking error number.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

diff --git a/mm/cma.c b/mm/cma.c
index 1e1b017..01a0713 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -282,11 +282,12 @@ 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) {
-			clear_cma_bitmap(cma, pfn, count);
-			break;
 		}
+
 		clear_cma_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

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