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Subject: [PATCH v2] async: Using current_work() to implement
 current_is_async()
From:   Yunfeng Ye <yeyunfeng@huawei.com>
To:     Bart Van Assche <bvanassche@acm.org>,
        Alexander Duyck <alexander.h.duyck@linux.intel.com>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        <bhelgaas@google.com>, David Sterba <dsterba@suse.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        <sakari.ailus@linux.intel.com>
CC:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "hushiyuan@huawei.com" <hushiyuan@huawei.com>,
        "linfeilong@huawei.com" <linfeilong@huawei.com>
References: <0147097c-0ce2-5944-932a-8fd53eed4ff6@huawei.com>
Message-ID: <a2896834-54c7-5842-d062-c19688b09fbb@huawei.com>
Date:   Sat, 26 Oct 2019 18:56:42 +0800
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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@huawei.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.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