linux-kernel - [PATCH v2] Remove node's validity check in alloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 14 Apr 2010 23:58:34 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Bob Liu <lliubbo@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Minchan Kim <minchan.kim@...il.com>
Subject: [PATCH v2] Remove node's validity check in alloc_pages

V2
 * Add some reviewed-by

alloc_pages calls alloc_pages_node with numa_node_id().
alloc_pages_node can't see nid < 0.

So we can use alloc_pages_exact_node instead of alloc_pages_node.
It could avoid comparison and branch as 6484eb3e2a81807722 tried.

Reviewed-by: Mel Gorman <mel@....ul.ie>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujisu.com>
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 include/linux/gfp.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 4c6d413..b65f003 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -308,7 +308,7 @@ extern struct page *alloc_page_vma(gfp_t gfp_mask,
 			struct vm_area_struct *vma, unsigned long addr);
 #else
 #define alloc_pages(gfp_mask, order) \
-		alloc_pages_node(numa_node_id(), gfp_mask, order)
+		alloc_pages_exact_node(numa_node_id(), gfp_mask, order)
 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
 #endif
 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
-- 
1.7.0.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/