treewide: Add __GFP_NOWARN to k.alloc calls with v.alloc fallbacks

Don't emit OOM warnings when k.alloc calls fail when
there there is a v.alloc immediately afterwards.

Converted a kmalloc/vmalloc with memset to kzalloc/vzalloc.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index bca26f3..ffdfe38 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -162,7 +162,7 @@
 {
 	void *ret;
 
-	ret = kmalloc(size, flags);
+	ret = kmalloc(size, flags | __GFP_NOWARN);
 	if (!ret)
 		ret = __vmalloc(size, flags, PAGE_KERNEL);
 	return ret;
@@ -172,7 +172,7 @@
 {
 	void *ret;
 
-	ret = kzalloc(size, flags);
+	ret = kzalloc(size, flags | __GFP_NOWARN);
 	if (!ret)
 		ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
 	return ret;