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authorTejun Heo <tj@kernel.org>2013-01-18 14:05:56 -0800
committerTejun Heo <tj@kernel.org>2013-01-18 14:05:56 -0800
commit84b233adcca3cacd5cfa8013a5feda7a3db4a9af (patch)
tree3d1f4a7f5f1d27dc08bb661691fd1470acf497a5 /kernel/async.c
parent2eaebdb33e1911c0cf3d44fd3596c42c6f502fab (diff)
downloadvexpress-lsk-84b233adcca3cacd5cfa8013a5feda7a3db4a9af.tar.gz
workqueue: implement current_is_async()
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>
Diffstat (limited to 'kernel/async.c')
-rw-r--r--kernel/async.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/kernel/async.c b/kernel/async.c
index 9d311838485..d9bf2a9b5ce 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -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;
+}