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workqueue: implement current_is_async()

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This function queries whether %current is an async worker executing an
async item.  This will be used to implement warning on synchronous
request_module() from async workers.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2013-01-18 14:05:56 -08:00
parent 2eaebdb33e
commit 84b233adcc
3 changed files with 26 additions and 0 deletions
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14
kernel/async.c
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@ -57,6 +57,8 @@ asynchronous and synchronous parts of the kernel.
#include <linux/slab.h>
#include <linux/workqueue.h>
#include "workqueue_internal.h"
static async_cookie_t next_cookie = 1;
#define MAX_WORK 32768
@ -337,3 +339,15 @@ void async_synchronize_cookie(async_cookie_t cookie)
async_synchronize_cookie_domain(cookie, &async_running);
}
EXPORT_SYMBOL_GPL(async_synchronize_cookie);
/**
* current_is_async - is %current an async worker task?
*
* Returns %true if %current is an async worker task.
*/
bool current_is_async(void)
{
struct worker *worker = current_wq_worker();
return worker && worker->current_func == async_run_entry_fn;
}