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workqueue: Don't call va_start / va_end twice

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Calling va_start / va_end multiple times is undefined and causes
problems with certain compiler / platforms.

Change alloc_ordered_workqueue_lockdep_map to a macro and updated
__alloc_workqueue to take a va_list argument.

Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Matthew Brost 2024-08-20 12:38:08 -07:00 committed by Tejun Heo
parent 8dffaec34d
commit 9b59a85a84
2 changed files with 3 additions and 19 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

16
include/linux/workqueue.h
View file

@ -543,20 +543,8 @@ alloc_workqueue_lockdep_map(const char *fmt, unsigned int flags, int max_active,
* RETURNS:
* Pointer to the allocated workqueue on success, %NULL on failure.
*/
__printf(1, 4) static inline struct workqueue_struct *
alloc_ordered_workqueue_lockdep_map(const char *fmt, unsigned int flags,
struct lockdep_map *lockdep_map, ...)
{
struct workqueue_struct *wq;
va_list args;
va_start(args, lockdep_map);
wq = alloc_workqueue_lockdep_map(fmt, WQ_UNBOUND | __WQ_ORDERED | flags,
1, lockdep_map, args);
va_end(args);
return wq;
}
#define alloc_ordered_workqueue_lockdep_map(fmt, flags, lockdep_map, args...) \
alloc_workqueue_lockdep_map(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, lockdep_map, ##args)
#endif
/**

6
kernel/workqueue.c
View file

@ -5619,12 +5619,10 @@ static void wq_adjust_max_active(struct workqueue_struct *wq)
} while (activated);
}
__printf(1, 4)
static struct workqueue_struct *__alloc_workqueue(const char *fmt,
unsigned int flags,
int max_active, ...)
int max_active, va_list args)
{
va_list args;
struct workqueue_struct *wq;
size_t wq_size;
int name_len;
@ -5656,9 +5654,7 @@ static struct workqueue_struct *__alloc_workqueue(const char *fmt,
goto err_free_wq;
}
va_start(args, max_active);
name_len = vsnprintf(wq->name, sizeof(wq->name), fmt, args);
va_end(args);
if (name_len >= WQ_NAME_LEN)
pr_warn_once("workqueue: name exceeds WQ_NAME_LEN. Truncating to: %s\n",