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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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1
include/linux/async.h
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@ -52,4 +52,5 @@ extern void async_synchronize_full_domain(struct async_domain *domain);
extern void async_synchronize_cookie(async_cookie_t cookie);
extern void async_synchronize_cookie_domain(async_cookie_t cookie,
struct async_domain *domain);
extern bool current_is_async(void);
#endif

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;
}

11
kernel/workqueue_internal.h
View File

@ -8,6 +8,7 @@
#define _KERNEL_WORKQUEUE_INTERNAL_H
#include <linux/workqueue.h>
#include <linux/kthread.h>
struct global_cwq;
struct worker_pool;
@ -44,6 +45,16 @@ struct worker {
struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */
};
/**
* current_wq_worker - return struct worker if %current is a workqueue worker
*/
static inline struct worker *current_wq_worker(void)
{
if (current->flags & PF_WQ_WORKER)
return kthread_data(current);
return NULL;
}
/*
* Scheduler hooks for concurrency managed workqueue. Only to be used from
* sched.c and workqueue.c.