From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Mosberger <davidm@napali.hpl.hp.com>
Date: Fri, 29 Apr 2005 11:37:25 +0000
Subject: Re: write_unlock: replace clear_bit with byte store
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>>>>> On Thu, 28 Apr 2005 13:53:11 -0700 (PDT), Christoph Lameter <clameter@engr.sgi.com> said:

  Christoph> I thought that a memory barrier was needed to insure that
  Christoph> the clearing of the lock becomes visible after changes
  Christoph> done in the critical section?

With "volatile", the compiler will generate stX.rel...

  Christoph> y is defined in its own block.

Ummh, macros 101: think about what happens for _raw_write_unlock(y)...

	--david