linux-kernel - [patch] mm, vmalloc: constify allocation mask

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Message-ID: <alpine.DEB.2.02.1406241527030.29176@chino.kir.corp.google.com>
Date:	Tue, 24 Jun 2014 15:30:41 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [patch] mm, vmalloc: constify allocation mask

tmp_mask in the __vmalloc_area_node() iteration never changes so it can be 
moved into function scope and marked with const.  This causes the movl and 
orl to only be done once per call rather than area->nr_pages times.

nested_gfp can also be marked const.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 mm/vmalloc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1566,7 +1566,8 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 	const int order = 0;
 	struct page **pages;
 	unsigned int nr_pages, array_size, i;
-	gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
+	const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
+	const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN;
 
 	nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
 	array_size = (nr_pages * sizeof(struct page *));
@@ -1589,12 +1590,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 
 	for (i = 0; i < area->nr_pages; i++) {
 		struct page *page;
-		gfp_t tmp_mask = gfp_mask | __GFP_NOWARN;
 
 		if (node == NUMA_NO_NODE)
-			page = alloc_page(tmp_mask);
+			page = alloc_page(alloc_mask);
 		else
-			page = alloc_pages_node(node, tmp_mask, order);
+			page = alloc_pages_node(node, alloc_mask, order);
 
 		if (unlikely(!page)) {
 			/* Successfully allocated i pages, free them in __vunmap() */
--
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