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Date: Thu, 23 Jan 2014 09:52:25 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Waiman Long <waiman.long@...com> Cc: Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, "the arch/x86 maintainers" <x86@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Steven Rostedt <rostedt@...dmis.org>, Andrew Morton <akpm@...ux-foundation.org>, Michel Lespinasse <walken@...gle.com>, Andi Kleen <andi@...stfloor.org>, Rik van Riel <riel@...hat.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, George Spelvin <linux@...izon.com>, Tim Chen <tim.c.chen@...ux.intel.com>, "Chandramouleeswaran, Aswin" <aswin@...com>, Scott J Norton <scott.norton@...com> Subject: Re: [PATCH v10 1/4] qrwlock: A queue read/write lock implementation On Thu, Jan 23, 2014 at 9:47 AM, Waiman Long <waiman.long@...com> wrote: > > Thank for the info. I am less familiar with that kind of issues on other > architecture. I will add a smp_mb__after_atomic_dec() & send out a new > patch. SInce it's the unlock path,. you need to use the "mb__*before*" versions, since presumably you want to protect what is inside the lock from leaking out, not some random thing after the lock from leaking in.. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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