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Commit 4bb6657d authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Linus Torvalds
Browse files

ipc,msg: document volatile r_msg 



The need for volatile is not obvious, document it.

Signed-off-by: default avatarDavidlohr Bueso <davidlohr@hp.com>
Signed-off-by: default avatarManfred Spraul <manfred@colorfullife.com>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3440a6bd

ipc/msg.c

+7 −3
Original line number Diff line number Diff line
@@ -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;

};