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ipc,msg: document volatile r_msg

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The need for volatile is not obvious, document it.

Signed-off-by: Davidlohr Bueso <[email protected]>
Signed-off-by: Manfred Spraul <[email protected]>
Cc: Aswin Chandramouleeswaran <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Davidlohr Bueso 2014-06-06 14:37:46 -07:00 • committed by Linus Torvalds
commit 4bb6657dd3
1 changed files with 7 additions and 3 deletions
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10
ipc/msg.c
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@ -42,9 +42,7 @@
#include <linux/uaccess.h>
#include "util.h"
/*
* one msg_receiver structure for each sleeping receiver:
*/
/* one msg_receiver structure for each sleeping receiver */
struct msg_receiver {
struct list_head r_list;
struct task_struct *r_tsk;
@ -53,6 +51,12 @@ struct msg_receiver {
long r_msgtype;
long r_maxsize;
/*
* Mark r_msg volatile so that the compiler
* does not try to get smart and optimize
* it. We rely on this for the lockless
* receive algorithm.
*/
struct msg_msg *volatile r_msg;
};