linux-kernel - [PATCH] sched: completion: document when to use wait_for_completion_io

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Message-Id: <1415098901-2768-1-git-send-email-wsa@the-dreams.de>
Date:	Tue,  4 Nov 2014 12:01:41 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Wolfram Sang <wsa@...-dreams.de>
Subject: [PATCH] sched: completion: document when to use wait_for_completion_io_*

As discussed [1], accounting IO is meant for blkio only. Document that
so driver authors won't use them for device io.

[1] http://thread.gmane.org/gmane.linux.drivers.i2c/20470

Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
---
 kernel/sched/completion.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/completion.c b/kernel/sched/completion.c
index a63f4dc27909..607f852b4d04 100644
--- a/kernel/sched/completion.c
+++ b/kernel/sched/completion.c
@@ -148,7 +148,7 @@ EXPORT_SYMBOL(wait_for_completion_timeout);
  *
  * This waits to be signaled for completion of a specific task. It is NOT
  * interruptible and there is no timeout. The caller is accounted as waiting
- * for IO.
+ * for IO (which traditionally means blkio only).
  */
 void __sched wait_for_completion_io(struct completion *x)
 {
@@ -163,7 +163,8 @@ EXPORT_SYMBOL(wait_for_completion_io);
  *
  * This waits for either a completion of a specific task to be signaled or for a
  * specified timeout to expire. The timeout is in jiffies. It is not
- * interruptible. The caller is accounted as waiting for IO.
+ * interruptible. The caller is accounted as waiting for IO (which traditionally
+ * means blkio only).
  *
  * Return: 0 if timed out, and positive (at least 1, or number of jiffies left
  * till timeout) if completed.
-- 
2.1.1

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