linux-kernel - [PATCH v2 1/4] ipc: remove bogus lock comment for ipc

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Message-ID: <1362476157.2225.51.camel@buesod1.americas.hpqcorp.net>
Date:	Tue, 05 Mar 2013 01:35:57 -0800
From:	Davidlohr Bueso <davidlohr.bueso@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>
Cc:	Emmanuel Benisty <benisty.e@...il.com>,
	"Vinod, Chegu" <chegu_vinod@...com>,
	"Low, Jason" <jason.low2@...com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>, aquini@...hat.com,
	Michel Lespinasse <walken@...gle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Larry Woodman <lwoodman@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2 1/4] ipc: remove bogus lock comment for ipc_checkid

There is no reason to be holding the ipc lock while
reading ipcp->seq, hence remove misleading comment.

Also simplify the return value for the function.

Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>
---
 ipc/util.h | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/ipc/util.h b/ipc/util.h
index eeb79a1..ac1480a 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -150,14 +150,9 @@ static inline int ipc_buildid(int id, int seq)
 	return SEQ_MULTIPLIER * seq + id;
 }
 
-/*
- * Must be called with ipcp locked
- */
 static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid)
 {
-	if (uid / SEQ_MULTIPLIER != ipcp->seq)
-		return 1;
-	return 0;
+	return uid / SEQ_MULTIPLIER != ipcp->seq;
 }
 
 static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
-- 
1.7.11.7





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