linux-kernel - [PATCH] kernel/workqueue: Verify alloc_workqueue() argument list consistency

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Date:   Tue, 19 Mar 2019 10:40:47 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Bart Van Assche <bvanassche@....org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH] kernel/workqueue: Verify alloc_workqueue() argument list consistency

This patch avoids that gcc reports the following warning when building
with W=1:

kernel/workqueue.c:4250:2: warning: function alloc_workqueue might be a candidate for gnu_printf format attribute [-Wsuggest-attribute=format]
  vsnprintf(wq->name, sizeof(wq->name), fmt, args);

Cc: Lai Jiangshan <jiangshanlai@...il.com>
Cc: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Fixes: 669de8bda87b ("kernel/workqueue: Use dynamic lockdep keys for workqueues")
Signed-off-by: Bart Van Assche <bvanassche@....org>
---
 include/linux/workqueue.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index d59525fca4d3..30737b5183c0 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -404,6 +404,7 @@ extern struct workqueue_struct *system_freezable_power_efficient_wq;
  * RETURNS:
  * Pointer to the allocated workqueue on success, %NULL on failure.
  */
+__printf(1, 4)
 struct workqueue_struct *alloc_workqueue(const char *fmt,
 					 unsigned int flags,
 					 int max_active, ...);
-- 
2.21.0.155.ge902e9bcae20