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workqueue: make workqueue->name[] fixed len 

Currently workqueue->name[] is of flexible length.  We want to use the
flexible field for something more useful and there isn't much benefit
in allowing arbitrary name length anyway.  Make it fixed len capping
at 24 bytes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
This commit is contained in:
Tejun Heo 2013-04-01 11:23:34 -07:00
parent 6029a91829
commit ecf6881ff3
1 changed files with 8 additions and 11 deletions
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19
kernel/workqueue.c
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@ -101,6 +101,8 @@ enum {
*/
RESCUER_NICE_LEVEL = -20,
HIGHPRI_NICE_LEVEL = -20,
WQ_NAME_LEN = 24,
};
/*
@ -252,7 +254,7 @@ struct workqueue_struct {
#ifdef CONFIG_LOCKDEP
struct lockdep_map lockdep_map;
#endif
char name[]; /* I: workqueue name */
char name[WQ_NAME_LEN]; /* I: workqueue name */
};
static struct kmem_cache *pwq_cache;
@ -3757,17 +3759,12 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
struct lock_class_key *key,
const char *lock_name, ...)
{
va_list args, args1;
va_list args;
struct workqueue_struct *wq;
struct pool_workqueue *pwq;
size_t namelen;
/* determine namelen, allocate wq and format name */
va_start(args, lock_name);
va_copy(args1, args);
namelen = vsnprintf(NULL, 0, fmt, args) + 1;
wq = kzalloc(sizeof(*wq) + namelen, GFP_KERNEL);
/* allocate wq and format name */
wq = kzalloc(sizeof(*wq), GFP_KERNEL);
if (!wq)
return NULL;
@ -3777,9 +3774,9 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
goto err_free_wq;
}
vsnprintf(wq->name, namelen, fmt, args1);
va_start(args, lock_name);
vsnprintf(wq->name, sizeof(wq->name), fmt, args);
va_end(args);
va_end(args1);
max_active = max_active ?: WQ_DFL_ACTIVE;
max_active = wq_clamp_max_active(max_active, flags, wq->name);