Subject: [merged] ipcmsg-document-volatile-r_msg.patch removed from -mm tree
To: davidlohr@xxxxxx,aswin@xxxxxx,manfred@xxxxxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 09 Jun 2014 12:37:47 -0700
The patch titled
Subject: ipc,msg: document volatile r_msg
has been removed from the -mm tree. Its filename was
ipcmsg-document-volatile-r_msg.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Davidlohr Bueso <davidlohr@xxxxxx>
Subject: ipc,msg: document volatile r_msg
The need for volatile is not obvious, document it.
Signed-off-by: Davidlohr Bueso <davidlohr@xxxxxx>
Signed-off-by: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>
Cc: Aswin Chandramouleeswaran <aswin@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/msg.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff -puN ipc/msg.c~ipcmsg-document-volatile-r_msg ipc/msg.c
--- a/ipc/msg.c~ipcmsg-document-volatile-r_msg
+++ a/ipc/msg.c
@@ -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;
};
_
Patches currently in -mm which might be from davidlohr@xxxxxx are
origin.patch
m68k-call-find_vma-with-the-mmap_sem-held-in-sys_cacheflush.patch
linux-next.patch
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