some kmalloc/memset ->kzalloc (tree wide)

Transform some calls to kmalloc/memset to a single kzalloc (or kcalloc).

Here is a short excerpt of the semantic patch performing
this transformation:

@@
type T2;
expression x;
identifier f,fld;
expression E;
expression E1,E2;
expression e1,e2,e3,y;
statement S;
@@

 x =
- kmalloc
+ kzalloc
  (E1,E2)
  ...  when != \(x->fld=E;\|y=f(...,x,...);\|f(...,x,...);\|x=E;\|while(...) S\|for(e1;e2;e3) S\)
- memset((T2)x,0,E1);

@@
expression E1,E2,E3;
@@

- kzalloc(E1 * E2,E3)
+ kcalloc(E1,E2,E3)

[akpm@linux-foundation.org: get kcalloc args the right way around]
Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Acked-by: Russell King <rmk@arm.linux.org.uk>
Cc: Bryan Wu <bryan.wu@analog.com>
Acked-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Dave Airlie <airlied@linux.ie>
Acked-by: Roland Dreier <rolandd@cisco.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Acked-by: Pierre Ossman <drzeus-list@drzeus.cx>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: "David S. Miller" <davem@davemloft.net>
Acked-by: Greg KH <greg@kroah.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 5 insertions, 14 deletions

diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
index f858fef6e41c..fb9e2ee998ae 100644
--- a/fs/dlm/memory.c
+++ b/fs/dlm/memory.c
@@ -39,9 +39,7 @@ char *allocate_lvb(struct dlm_ls *ls)
 {
 	char *p;
 
-	p = kmalloc(ls->ls_lvblen, GFP_KERNEL);
-	if (p)
-		memset(p, 0, ls->ls_lvblen);
+	p = kzalloc(ls->ls_lvblen, GFP_KERNEL);
 	return p;
 }
 
@@ -59,9 +57,7 @@ struct dlm_rsb *allocate_rsb(struct dlm_ls *ls, int namelen)
 
 	DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,);
 
-	r = kmalloc(sizeof(*r) + namelen, GFP_KERNEL);
-	if (r)
-		memset(r, 0, sizeof(*r) + namelen);
+	r = kzalloc(sizeof(*r) + namelen, GFP_KERNEL);
 	return r;
 }
 
@@ -101,9 +97,7 @@ struct dlm_direntry *allocate_direntry(struct dlm_ls *ls, int namelen)
 	DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,
 		   printk("namelen = %d\n", namelen););
 
-	de = kmalloc(sizeof(*de) + namelen, GFP_KERNEL);
-	if (de)
-		memset(de, 0, sizeof(*de) + namelen);
+	de = kzalloc(sizeof(*de) + namelen, GFP_KERNEL);
 	return de;
 }
 
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 3eefa97fe204..a6b1072daea7 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -883,13 +883,11 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
 		goto failed_mount;
 	}
 	bgl_lock_init(&sbi->s_blockgroup_lock);
-	sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts),
-			       GFP_KERNEL);
+	sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
 	if (!sbi->s_debts) {
 		printk ("EXT2-fs: not enough memory\n");
 		goto failed_mount_group_desc;
 	}
-	memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts));
 	for (i = 0; i < db_count; i++) {
 		block = descriptor_loc(sb, logic_sb_block, i);
 		sbi->s_group_desc[i] = sb_bread(sb, block);
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 98e0b85a9bb2..783c57ec07d3 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -372,11 +372,10 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len,
 {
 	struct hd_struct *p;
 
-	p = kmalloc(sizeof(*p), GFP_KERNEL);
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (!p)
 		return;
 	
-	memset(p, 0, sizeof(*p));
 	p->start_sect = start;
 	p->nr_sects = len;
 	p->partno = part;