From: Phillip Lougher <phillip@lougher.demon.co.uk>
Date: Tue, 22 Mar 2011 23:01:26 +0000 (+0000)
Subject: Squashfs: Use vmalloc rather than kmalloc for zlib workspace
X-Git-Tag: v2.6.39-rc1~94^2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=117a91e0f25fd7698e20ac3dfa62086be3dc82a3

Squashfs: Use vmalloc rather than kmalloc for zlib workspace

Bugzilla bug 31422 reports occasional "page allocation failure. order:4"
at Squashfs mount time.  Fix this by making zlib workspace allocation
use vmalloc rather than kmalloc.

Reported-by: Mehmet Giritli <mehmet@giritli.eu>
Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
---

diff --git a/fs/squashfs/zlib_wrapper.c b/fs/squashfs/zlib_wrapper.c
index 195b0d035e9b..517688b32ffa 100644
--- a/fs/squashfs/zlib_wrapper.c
+++ b/fs/squashfs/zlib_wrapper.c
@@ -26,6 +26,7 @@
 #include <linux/buffer_head.h>
 #include <linux/slab.h>
 #include <linux/zlib.h>
+#include <linux/vmalloc.h>
 
 #include "squashfs_fs.h"
 #include "squashfs_fs_sb.h"
@@ -37,8 +38,7 @@ static void *zlib_init(struct squashfs_sb_info *dummy, void *buff, int len)
 	z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL);
 	if (stream == NULL)
 		goto failed;
-	stream->workspace = kmalloc(zlib_inflate_workspacesize(),
-		GFP_KERNEL);
+	stream->workspace = vmalloc(zlib_inflate_workspacesize());
 	if (stream->workspace == NULL)
 		goto failed;
 
@@ -56,7 +56,7 @@ static void zlib_free(void *strm)
 	z_stream *stream = strm;
 
 	if (stream)
-		kfree(stream->workspace);
+		vfree(stream->workspace);
 	kfree(stream);
 }