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OpenCloudOS-Kernel
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Slab allocators: Replace explicit zeroing with __GFP_ZERO 

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 <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-07-17 04:03:29 -07:00 committed by Linus Torvalds
parent 81cda66261
commit 94f6030ca7
12 changed files with 30 additions and 38 deletions
Show Stats 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");

4
drivers/ide/ide-probe.c
View File

@ -1073,14 +1073,14 @@ static int init_irq (ide_hwif_t *hwif)
hwgroup->hwif->next = hwif;
spin_unlock_irq(&ide_lock);
} else {
hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
GFP_KERNEL | __GFP_ZERO,
hwif_to_node(hwif->drives[0].hwif));
if (!hwgroup)
goto out_up;
hwif->hwgroup = hwgroup;
memset(hwgroup, 0, sizeof(ide_hwgroup_t));
hwgroup->hwif = hwif->next = hwif;
hwgroup->rq = NULL;
hwgroup->handler = NULL;

4
kernel/timer.c
View File

@ -1221,7 +1221,8 @@ static int __devinit init_timers_cpu(int cpu)
/*
* The APs use this path later in boot
*/
base = kmalloc_node(sizeof(*base), GFP_KERNEL,
base = kmalloc_node(sizeof(*base),
GFP_KERNEL | __GFP_ZERO,
cpu_to_node(cpu));
if (!base)
return -ENOMEM;
@ -1232,7 +1233,6 @@ static int __devinit init_timers_cpu(int cpu)
kfree(base);
return -ENOMEM;
}
memset(base, 0, sizeof(*base));
per_cpu(tvec_bases, cpu) = base;
} else {
/*

3
lib/genalloc.c
View File

@ -54,11 +54,10 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
int nbytes = sizeof(struct gen_pool_chunk) +
(nbits + BITS_PER_BYTE - 1) / BITS_PER_BYTE;
chunk = kmalloc_node(nbytes, GFP_KERNEL, nid);
chunk = kmalloc_node(nbytes, GFP_KERNEL | __GFP_ZERO, nid);
if (unlikely(chunk == NULL))
return -1;
memset(chunk, 0, nbytes);
spin_lock_init(&chunk->lock);
chunk->start_addr = addr;
chunk->end_addr = addr + size;

9
mm/allocpercpu.c
View File

@ -53,12 +53,9 @@ void *percpu_populate(void *__pdata, size_t size, gfp_t gfp, int cpu)
int node = cpu_to_node(cpu);
BUG_ON(pdata->ptrs[cpu]);
if (node_online(node)) {
/* FIXME: kzalloc_node(size, gfp, node) */
pdata->ptrs[cpu] = kmalloc_node(size, gfp, node);
if (pdata->ptrs[cpu])
memset(pdata->ptrs[cpu], 0, size);
} else
if (node_online(node))
pdata->ptrs[cpu] = kmalloc_node(size, gfp|__GFP_ZERO, node);
else
pdata->ptrs[cpu] = kzalloc(size, gfp);
return pdata->ptrs[cpu];
}

3
mm/mempool.c
View File

@ -62,10 +62,9 @@ mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
mempool_free_t *free_fn, void *pool_data, int node_id)
{
mempool_t *pool;
pool = kmalloc_node(sizeof(*pool), GFP_KERNEL, node_id);
pool = kmalloc_node(sizeof(*pool), GFP_KERNEL | __GFP_ZERO, node_id);
if (!pool)
return NULL;
memset(pool, 0, sizeof(*pool));
pool->elements = kmalloc_node(min_nr * sizeof(void *),
GFP_KERNEL, node_id);
if (!pool->elements) {

6
mm/vmalloc.c
View File

@ -432,11 +432,12 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
area->nr_pages = nr_pages;
/* Please note that the recursion is strictly bounded. */
if (array_size > PAGE_SIZE) {
pages = __vmalloc_node(array_size, gfp_mask, PAGE_KERNEL, node);
pages = __vmalloc_node(array_size, gfp_mask | __GFP_ZERO,
PAGE_KERNEL, node);
area->flags |= VM_VPAGES;
} else {
pages = kmalloc_node(array_size,
(gfp_mask & GFP_LEVEL_MASK),
(gfp_mask & GFP_LEVEL_MASK) | __GFP_ZERO,
node);
}
area->pages = pages;
@ -445,7 +446,6 @@ void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
kfree(area);
return NULL;
}
memset(area->pages, 0, array_size);
for (i = 0; i < area->nr_pages; i++) {
if (node < 0)