linux-kernel - [PATCH v2] async: Using current_work() to implement current_is

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Date:   Fri, 27 Sep 2019 11:29:06 +0800
From:   Yunfeng Ye <yeyunfeng@...wei.com>
To:     Bart Van Assche <bvanassche@....org>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        <bhelgaas@...gle.com>, David Sterba <dsterba@...e.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        <sakari.ailus@...ux.intel.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] async: Using current_work() to implement
 current_is_async()

current_is_async() can be implemented using current_work(), it's better
not to be aware of the workqueue's internal information.

Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
Reviewed-by: Bart Van Assche <bvanassche@....org>
---
v1 -> v2:
 - add "Reviewed-by"

 kernel/async.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/async.c b/kernel/async.c
index 1de270d..a849f98 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -53,8 +53,6 @@ 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
@@ -327,8 +325,8 @@ EXPORT_SYMBOL_GPL(async_synchronize_cookie);
  */
 bool current_is_async(void)
 {
-	struct worker *worker = current_wq_worker();
+	struct work_struct *work = current_work();

-	return worker && worker->current_func == async_run_entry_fn;
+	return work && work->func == async_run_entry_fn;
 }
 EXPORT_SYMBOL_GPL(current_is_async);
-- 
2.7.4