From: Zoltan Menyhart <Zoltan.Menyhart@bull.net>
Date: Fri, 13 Jan 2006 16:25:23 +0000 (+0100)
Subject: [IA64] Fix bug in ia64 specific down() function
X-Git-Tag: v2.6.16-rc2~258^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b16bfbf8f8013fefb49592d030ff87651ab48cb;p=pandora-kernel.git

[IA64] Fix bug in ia64 specific down() function

Chen, Kenneth W wrote:
> The memory order semantics for include/asm-ia64/semaphore.h:down()
> doesn't look right.  It is using atomic_dec_return, which eventually
> translate into ia64_fetch_and_add() that uses release semantics.
> Shouldn't it use acquire semantics?

Use ia64_fetchadd() instead of atomic_dec_return()

Acked-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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