[PATCH] Transform kmem_cache_alloc()+memset(0) -> kmem_cache_zalloc().

Replace appropriate pairs of "kmem_cache_alloc()" + "memset(0)" with the
corresponding "kmem_cache_zalloc()" call.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Roland McGrath <roland@redhat.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Greg KH <greg@kroah.com>
Acked-by: Joel Becker <Joel.Becker@oracle.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Jan Kara <jack@ucw.cz>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: James Morris <jmorris@namei.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 8 insertions, 16 deletions

diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index a86a55c..75bbfae 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1332,13 +1332,13 @@ int ecryptfs_write_headers(struct dentry *ecryptfs_dentry,
 		goto out;
 	}
 	/* Released in this function */
-	page_virt = kmem_cache_alloc(ecryptfs_header_cache_0, GFP_USER);
+	page_virt = kmem_cache_zalloc(ecryptfs_header_cache_0, GFP_USER);
 	if (!page_virt) {
 		ecryptfs_printk(KERN_ERR, "Out of memory\n");
 		rc = -ENOMEM;
 		goto out;
 	}
-	memset(page_virt, 0, PAGE_CACHE_SIZE);
+
 	rc = ecryptfs_write_headers_virt(page_virt, crypt_stat,
 					 ecryptfs_dentry);
 	if (unlikely(rc)) {
diff --git a/fs/ecryptfs/file.c b/fs/ecryptfs/file.c
index c5a2e52..779c347 100644
--- a/fs/ecryptfs/file.c
+++ b/fs/ecryptfs/file.c
@@ -251,7 +251,7 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
 	int lower_flags;
 
 	/* Released in ecryptfs_release or end of function if failure */
-	file_info = kmem_cache_alloc(ecryptfs_file_info_cache, GFP_KERNEL);
+	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
 	ecryptfs_set_file_private(file, file_info);
 	if (!file_info) {
 		ecryptfs_printk(KERN_ERR,
@@ -259,7 +259,6 @@ static int ecryptfs_open(struct inode *inode, struct file *file)
 		rc = -ENOMEM;
 		goto out;
 	}
-	memset(file_info, 0, sizeof(*file_info));
 	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
 	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
 	mount_crypt_stat = &ecryptfs_superblock_to_private(
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 11f5e50..d4f02f3 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -361,8 +361,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
 		goto out;
 	}
 	/* Released in this function */
-	page_virt =
-	    (char *)kmem_cache_alloc(ecryptfs_header_cache_2,
+	page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2,
 				     GFP_USER);
 	if (!page_virt) {
 		rc = -ENOMEM;
@@ -370,7 +369,7 @@ static struct dentry *ecryptfs_lookup(struct inode *dir, struct dentry *dentry,
 				"Cannot ecryptfs_kmalloc a page\n");
 		goto out_dput;
 	}
-	memset(page_virt, 0, PAGE_CACHE_SIZE);
+
 	rc = ecryptfs_read_header_region(page_virt, lower_dentry, nd->mnt);
 	crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
 	if (!ECRYPTFS_CHECK_FLAG(crypt_stat->flags, ECRYPTFS_POLICY_APPLIED))
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 745c0f1..80bccd5 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -207,14 +207,12 @@ parse_tag_3_packet(struct ecryptfs_crypt_stat *crypt_stat,
 	/* Released: wipe_auth_tok_list called in ecryptfs_parse_packet_set or
 	 * at end of function upon failure */
 	auth_tok_list_item =
-	    kmem_cache_alloc(ecryptfs_auth_tok_list_item_cache, GFP_KERNEL);
+	    kmem_cache_zalloc(ecryptfs_auth_tok_list_item_cache, GFP_KERNEL);
 	if (!auth_tok_list_item) {
 		ecryptfs_printk(KERN_ERR, "Unable to allocate memory\n");
 		rc = -ENOMEM;
 		goto out;
 	}
-	memset(auth_tok_list_item, 0,
-	       sizeof(struct ecryptfs_auth_tok_list_item));
 	(*new_auth_tok) = &auth_tok_list_item->auth_tok;
 
 	/* check for body size - one to two bytes */
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index d0541ae..fe41ab1 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -378,15 +378,13 @@ ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
 
 	/* Released in ecryptfs_put_super() */
 	ecryptfs_set_superblock_private(sb,
-					kmem_cache_alloc(ecryptfs_sb_info_cache,
+					kmem_cache_zalloc(ecryptfs_sb_info_cache,
 							 GFP_KERNEL));
 	if (!ecryptfs_superblock_to_private(sb)) {
 		ecryptfs_printk(KERN_WARNING, "Out of memory\n");
 		rc = -ENOMEM;
 		goto out;
 	}
-	memset(ecryptfs_superblock_to_private(sb), 0,
-	       sizeof(struct ecryptfs_sb_info));
 	sb->s_op = &ecryptfs_sops;
 	/* Released through deactivate_super(sb) from get_sb_nodev */
 	sb->s_root = d_alloc(NULL, &(const struct qstr) {
@@ -402,7 +400,7 @@ ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
 	/* Released in d_release when dput(sb->s_root) is called */
 	/* through deactivate_super(sb) from get_sb_nodev() */
 	ecryptfs_set_dentry_private(sb->s_root,
-				    kmem_cache_alloc(ecryptfs_dentry_info_cache,
+				    kmem_cache_zalloc(ecryptfs_dentry_info_cache,
 						     GFP_KERNEL));
 	if (!ecryptfs_dentry_to_private(sb->s_root)) {
 		ecryptfs_printk(KERN_ERR,
@@ -410,8 +408,6 @@ ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
 		rc = -ENOMEM;
 		goto out;
 	}
-	memset(ecryptfs_dentry_to_private(sb->s_root), 0,
-	       sizeof(struct ecryptfs_dentry_info));
 	rc = 0;
 out:
 	/* Should be able to rely on deactivate_super called from