From: Rik van Riel <riel@redhat.com>
To: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Emmanuel Benisty <benisty.e@gmail.com>,
"Vinod, Chegu" <chegu_vinod@hp.com>,
"Low, Jason" <jason.low2@hp.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
aquini@redhat.com, Michel Lespinasse <walken@google.com>,
Ingo Molnar <mingo@kernel.org>,
Larry Woodman <lwoodman@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v2 4/4] ipc: sem: do not hold ipc lock more than necessary
Date: Tue, 05 Mar 2013 18:11:04 -0500 [thread overview]
Message-ID: <51367B88.7000908@redhat.com> (raw)
In-Reply-To: <1362476179.2225.54.camel@buesod1.americas.hpqcorp.net>
On 03/05/2013 04:36 AM, Davidlohr Bueso wrote:
> @@ -888,27 +924,34 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum,
> {
> struct sem_array *sma;
> struct sem* curr;
> - int err;
> + int err, nsems;
> ushort fast_sem_io[SEMMSL_FAST];
> ushort* sem_io = fast_sem_io;
> - int nsems;
> struct list_head tasks;
>
> - sma = sem_lock_check(ns, semid);
> - if (IS_ERR(sma))
> + INIT_LIST_HEAD(&tasks);
> +
> + rcu_read_lock();
> + sma = sem_obtain_object_check(ns, semid);
> + if (IS_ERR(sma)) {
> + rcu_read_lock();
I assume this should be an rcu_read_unlock? :)
> return PTR_ERR(sma);
> + }
--
All rights reversed
next prev parent reply other threads:[~2013-03-05 23:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-05 9:36 Davidlohr Bueso
2013-03-05 23:11 ` Rik van Riel [this message]
2013-03-20 14:27 ` Rik van Riel
2013-03-20 15:38 ` Rik van Riel
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