Re: [PATCH v10 1/4] qrwlock: A queue read/write lock implementation

From: Linus Torvalds
Date: Thu Jan 23 2014 - 12:52:33 EST

On Thu, Jan 23, 2014 at 9:47 AM, Waiman Long <waiman.long@xxxxxx> 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

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