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Slab allocators: Replace explicit zeroing with __GFP_ZERO

Browse source 
kmalloc_node() and kmem_cache_alloc_node() were not available in a zeroing
variant in the past.  But with __GFP_ZERO it is possible now to do zeroing
while allocating.

Use __GFP_ZERO to remove the explicit clearing of memory via memset whereever
we can.

Signed-off-by: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2007-07-17 04:03:29 -07:00 • committed by Linus Torvalds
commit 94f6030ca7
12 changed files with 30 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

3
block/as-iosched.c
View file

@ -1322,10 +1322,9 @@ static void *as_init_queue(request_queue_t *q)
{
struct as_data *ad;
ad = kmalloc_node(sizeof(*ad), GFP_KERNEL, q->node);
ad = kmalloc_node(sizeof(*ad), GFP_KERNEL | __GFP_ZERO, q->node);
if (!ad)
return NULL;
memset(ad, 0, sizeof(*ad));
ad->q = q; /* Identify what queue the data belongs to */

18
block/cfq-iosched.c
View file

@ -1251,9 +1251,9 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
{
struct cfq_io_context *cic;
cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask, cfqd->queue->node);
cic = kmem_cache_alloc_node(cfq_ioc_pool, gfp_mask | __GFP_ZERO,
cfqd->queue->node);
if (cic) {
memset(cic, 0, sizeof(*cic));
cic->last_end_request = jiffies;
INIT_LIST_HEAD(&cic->queue_list);
cic->dtor = cfq_free_io_context;
@ -1376,17 +1376,19 @@ retry:
* free memory.
*/
spin_unlock_irq(cfqd->queue->queue_lock);
new_cfqq = kmem_cache_alloc_node(cfq_pool, gfp_mask|__GFP_NOFAIL, cfqd->queue->node);
new_cfqq = kmem_cache_alloc_node(cfq_pool,
gfp_mask | __GFP_NOFAIL | __GFP_ZERO,
cfqd->queue->node);
spin_lock_irq(cfqd->queue->queue_lock);
goto retry;
} else {
cfqq = kmem_cache_alloc_node(cfq_pool, gfp_mask, cfqd->queue->node);
cfqq = kmem_cache_alloc_node(cfq_pool,
gfp_mask | __GFP_ZERO,
cfqd->queue->node);
if (!cfqq)
goto out;
}
memset(cfqq, 0, sizeof(*cfqq));
RB_CLEAR_NODE(&cfqq->rb_node);
INIT_LIST_HEAD(&cfqq->fifo);
@ -2079,12 +2081,10 @@ static void *cfq_init_queue(request_queue_t *q)
{
struct cfq_data *cfqd;
cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL, q->node);
cfqd = kmalloc_node(sizeof(*cfqd), GFP_KERNEL | __GFP_ZERO, q->node);
if (!cfqd)
return NULL;
memset(cfqd, 0, sizeof(*cfqd));
cfqd->service_tree = CFQ_RB_ROOT;
INIT_LIST_HEAD(&cfqd->cic_list);

3
block/deadline-iosched.c
View file

@ -360,10 +360,9 @@ static void *deadline_init_queue(request_queue_t *q)
{
struct deadline_data *dd;
dd = kmalloc_node(sizeof(*dd), GFP_KERNEL, q->node);
dd = kmalloc_node(sizeof(*dd), GFP_KERNEL | __GFP_ZERO, q->node);
if (!dd)
return NULL;
memset(dd, 0, sizeof(*dd));
INIT_LIST_HEAD(&dd->fifo_list[READ]);
INIT_LIST_HEAD(&dd->fifo_list[WRITE]);

3
block/elevator.c
View file

@ -177,11 +177,10 @@ static elevator_t *elevator_alloc(request_queue_t *q, struct elevator_type *e)
elevator_t *eq;
int i;
eq = kmalloc_node(sizeof(elevator_t), GFP_KERNEL, q->node);
eq = kmalloc_node(sizeof(elevator_t), GFP_KERNEL | __GFP_ZERO, q->node);
if (unlikely(!eq))
goto err;
memset(eq, 0, sizeof(*eq));
eq->ops = &e->ops;
eq->elevator_type = e;
kobject_init(&eq->kobj);

8
block/genhd.c
View file

@ -726,21 +726,21 @@ struct gendisk *alloc_disk_node(int minors, int node_id)
{
struct gendisk *disk;
disk = kmalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id);
disk = kmalloc_node(sizeof(struct gendisk),
GFP_KERNEL | __GFP_ZERO, node_id);
if (disk) {
memset(disk, 0, sizeof(struct gendisk));
if (!init_disk_stats(disk)) {
kfree(disk);
return NULL;
}
if (minors > 1) {
int size = (minors - 1) * sizeof(struct hd_struct *);
disk->part = kmalloc_node(size, GFP_KERNEL, node_id);
disk->part = kmalloc_node(size,
GFP_KERNEL | __GFP_ZERO, node_id);
if (!disk->part) {
kfree(disk);
return NULL;
}
memset(disk->part, 0, size);
}
disk->minors = minors;
kobj_set_kset_s(disk,block_subsys);

4
block/ll_rw_blk.c
View file

@ -1829,11 +1829,11 @@ request_queue_t *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
{
request_queue_t *q;
q = kmem_cache_alloc_node(requestq_cachep, gfp_mask, node_id);
q = kmem_cache_alloc_node(requestq_cachep,
gfp_mask | __GFP_ZERO, node_id);
if (!q)
return NULL;
memset(q, 0, sizeof(*q));
init_timer(&q->unplug_timer);
snprintf(q->kobj.name, KOBJ_NAME_LEN, "%s", "queue");