From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
Davidlohr Bueso <dave@stgolabs.net>,
Dmitry Vyukov <dvyukov@google.com>,
Peter Zijlstra <peterz@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH RFC] locking: Add volatile to arch_spinlock_t structures
Date: Thu, 4 Dec 2014 12:12:05 -0800 [thread overview]
Message-ID: <20141204201205.GA27787@linux.vnet.ibm.com> (raw)
In-Reply-To: <20141204200052.GY25340@linux.vnet.ibm.com>
On Thu, Dec 04, 2014 at 12:00:52PM -0800, Paul E. McKenney wrote:
[ . . . ]
> So any compiler that clobbers some adjacent non-bitfield variable or
> field that is accessible by other threads is not just despicable, it
> fails to conform to the standard.
>
> Whew! ;-)
And part of the reason for my confusion is that I am using an old version
of gcc, 4.6.3. Apparently this aspect of gcc wasn't fixed until 4.7
or thereabouts.
Thanx, Paul
next prev parent reply other threads:[~2014-12-04 20:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-04 6:20 [PATCH RFC] locking: Add volatile to arch_spinlock_t structures Paul E. McKenney
[not found] ` <CA+55aFzn-6asfWHB8SAvz4GJWz7uEriujgVLfaqoo_VPtNBLuA@mail.gmail.com>
2014-12-04 6:57 ` Paul E. McKenney
[not found] ` <CA+55aFxGCxQNE4HzRP_Uk2FmFDn_+Hfm6GBz75S+5+SDeODVJQ@mail.gmail.com>
2014-12-04 7:02 ` Paul E. McKenney
2014-12-04 18:02 ` Linus Torvalds
2014-12-04 18:36 ` Paul E. McKenney
2014-12-04 19:18 ` Linus Torvalds
2014-12-04 20:00 ` Paul E. McKenney
2014-12-04 20:12 ` Paul E. McKenney [this message]
2014-12-04 21:45 ` One Thousand Gnomes
2014-12-04 22:06 ` Paul E. McKenney
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