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From: Peter Zijlstra <peterz@infradead.org>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	jejb@parisc-linux.org, deller@gmx.de,
	John David Anglin <dave.anglin@bell.net>,
	linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org,
	paulmck@linux.vnet.ibm.com, chegu_vinod@hp.com,
	Waiman.Long@hp.com, tglx@linutronix.de, riel@redhat.com,
	akpm@linux-foundation.org, davidlohr@hp.com, hpa@zytor.com,
	andi@firstfloor.org, aswin@hp.com, scott.norton@hp.com,
	Jason Low <jason.low2@hp.com>
Subject: Re: [PATCH v2] introduce atomic_pointer to fix a race condition in cancelable mcs spinlocks
Date: Mon, 2 Jun 2014 18:30:32 +0200	[thread overview]
Message-ID: <20140602163032.GI16155@laptop.programming.kicks-ass.net> (raw)
In-Reply-To: <20140602162525.GH16155@laptop.programming.kicks-ass.net>

On Mon, Jun 02, 2014 at 06:25:25PM +0200, Peter Zijlstra wrote:
> I'm almost inclined to just exclude parisc from using opt spinning.
> 
> That said, this patch still doesn't address the far more interesting
> problem of actually finding these issues for these few weird archs.

So why do these archs provide xchg() and cmpxchg() at all? Wouldn't it
be much simpler if archs that cannot sanely do this, not provide these
primitives at all?

  reply	other threads:[~2014-06-02 16:30 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-01 17:53 [PATCH] fix a race condition in cancelable mcs spinlocks Mikulas Patocka
2014-06-01 19:20 ` Peter Zijlstra
2014-06-01 20:46   ` John David Anglin
2014-06-01 21:30     ` Peter Zijlstra
2014-06-01 21:46       ` Paul E. McKenney
2014-06-02  9:19       ` Mikulas Patocka
2014-06-02 13:24         ` Paul E. McKenney
2014-06-02 15:57           ` Mikulas Patocka
2014-06-02 16:39             ` Paul E. McKenney
2014-06-02 19:56       ` James Bottomley
2014-06-03  7:56         ` Peter Zijlstra
2014-06-04 12:53           ` Mikulas Patocka
2014-06-02 13:58     ` Mikulas Patocka
2014-06-02 14:02       ` Mikulas Patocka
2014-06-02 15:39         ` John David Anglin
2014-06-02 10:34   ` Mikulas Patocka
2014-06-02 14:14 ` Waiman Long
2014-06-02 15:27   ` Jason Low
2014-06-02 16:00 ` [PATCH v2] introduce atomic_pointer to " Mikulas Patocka
2014-06-02 16:25   ` Peter Zijlstra
2014-06-02 16:30     ` Peter Zijlstra [this message]
2014-06-02 16:46       ` Paul E. McKenney
2014-06-02 17:33       ` Waiman Long
2014-06-02 20:05         ` Peter Zijlstra
2014-06-02 20:22           ` Linus Torvalds
2014-06-02 21:02             ` Paul E. McKenney
2014-06-02 21:12               ` Linus Torvalds
2014-06-02 22:08                 ` Paul E. McKenney
2014-06-02 22:44                   ` Eric Dumazet
2014-06-02 23:17                     ` Paul E. McKenney
2014-06-02 23:53                       ` Eric Dumazet
2014-06-03  0:28                         ` Paul E. McKenney
2014-06-02 22:55                   ` Linus Torvalds
2014-06-03 16:48                     ` Paul E. McKenney
2014-06-03  7:54             ` Peter Zijlstra
2014-06-02 20:24           ` James Bottomley
2014-06-02 16:43     ` Paul E. McKenney
2014-06-02 17:14       ` James Bottomley
2014-06-02 17:29       ` Waiman Long
2014-06-02 17:09     ` Linus Torvalds
2014-06-02 17:12       ` Davidlohr Bueso
2014-06-02 17:42         ` Waiman Long
2014-06-02 20:46       ` Mikulas Patocka
2014-06-02 20:53         ` Linus Torvalds
2014-06-02 21:12           ` Mikulas Patocka
2014-06-03  7:36             ` Peter Zijlstra
2014-06-03 11:14               ` Mikulas Patocka
2014-06-03 13:24                 ` Peter Zijlstra
2014-06-03 14:18                   ` Mikulas Patocka
2014-06-03 14:07               ` Paul E. McKenney
2014-06-03 15:09                 ` Peter Zijlstra
2014-06-03 15:56                   ` Paul E. McKenney
2014-06-03  7:20         ` Peter Zijlstra
2014-06-02 21:03       ` Paul E. McKenney
2014-06-06 15:06       ` Peter Zijlstra
2014-06-06 15:15         ` Paul E. McKenney
2014-06-06 15:42         ` Davidlohr Bueso
2014-06-02 16:50   ` Jason Low
2014-06-02 17:03     ` Paul E. McKenney
2014-06-02 17:25     ` Waiman Long
2014-06-02 17:38       ` H. Peter Anvin

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