From: Davidlohr Bueso <davidlohr@hp.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Darren Hart <dvhart@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Mike Galbraith <efault@gmx.de>, Jeff Mahoney <jeffm@suse.com>,
Jason Low <jason.low2@hp.com>, Waiman Long <Waiman.Long@hp.com>,
Tom Vaden <tom.vaden@hp.com>,
"Norton, Scott J" <scott.norton@hp.com>,
"Chandramouleeswaran, Aswin" <aswin@hp.com>
Subject: Re: [PATCH 5/4] futex: silence uninitialized warnings
Date: Mon, 06 Jan 2014 19:02:23 -0800 [thread overview]
Message-ID: <1389063743.9937.7.camel@buesod1.americas.hpqcorp.net> (raw)
In-Reply-To: <CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com>
On Tue, 2014-01-07 at 10:55 +0800, Linus Torvalds wrote:
> On Mon, Jan 6, 2014 at 9:38 AM, Davidlohr Bueso <davidlohr@hp.com> wrote:
> > {
> > int lock_taken, ret, force_take = 0;
> > - u32 uval, newval, curval, vpid = task_pid_vnr(task);
> > + u32 uval, newval, uninitialized_var(curval), vpid = task_pid_vnr(task);
>
> Do you have some broken compiler?
I only notice this when testing this patchset on our servers with RHEL
6.4 (gcc 4.4.7 20120313 (Red Hat 4.4.7-3)).
> I really tend to hate this kind of
> workarounds, because as mentioned, they can actually hide valid
> warnings, and it seems to be due to just stupid compilers. Are we
> perhaps better off trying to get people off the broken compiler
> versions instead?
As Darren points out, this path is unlikely to change, but I have no
particular preference otherwise.
prev parent reply other threads:[~2014-01-07 3:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-02 15:05 [PATCH v5 0/4] futex: Wakeup optimizations Davidlohr Bueso
2014-01-02 15:05 ` [PATCH v5 1/4] futex: Misc cleanups Davidlohr Bueso
2014-01-11 6:43 ` Paul E. McKenney
2014-01-02 15:05 ` [PATCH v5 2/4] futex: Larger hash table Davidlohr Bueso
2014-01-11 7:37 ` Paul E. McKenney
2014-01-02 15:05 ` [PATCH v5 3/4] futex: Document ordering guarantees Davidlohr Bueso
2014-01-06 18:58 ` Darren Hart
2014-01-11 7:40 ` Paul E. McKenney
2014-01-02 15:05 ` [PATCH v5 4/4] futex: Avoid taking hb lock if nothing to wakeup Davidlohr Bueso
2014-01-02 19:23 ` Linus Torvalds
2014-01-02 20:59 ` Davidlohr Bueso
2014-01-06 20:56 ` Darren Hart
2014-01-06 20:52 ` Darren Hart
2014-01-07 3:29 ` Davidlohr Bueso
2014-01-07 17:40 ` Darren Hart
2014-01-11 9:49 ` Paul E. McKenney
2014-01-11 9:52 ` Paul E. McKenney
2014-01-11 18:21 ` Davidlohr Bueso
2014-01-06 0:59 ` [PATCH v5 0/4] futex: Wakeup optimizations Davidlohr Bueso
2014-01-06 1:38 ` [PATCH 5/4] futex: silence uninitialized warnings Davidlohr Bueso
2014-01-06 18:48 ` Darren Hart
2014-01-07 2:55 ` Linus Torvalds
2014-01-07 3:02 ` Davidlohr Bueso [this message]
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