From: Tony Luck <tony.luck@intel.com>
Date: Wed, 30 Jun 2010 17:46:16 +0000 (-0700)
Subject: [IA64] Fix spinaphore down_spin()
X-Git-Tag: v2.6.35-rc4~16^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b70f4e85bfc4d7000036355b714a92d5c574f1be;p=pandora-kernel.git

[IA64] Fix spinaphore down_spin()

Typo in down_spin() meant it only read the low 32 bits of the
"serve" value, instead of the full 64 bits. This results in the
system hanging when the values in ticket/serve get larger than
32-bits. A big enough system running the right test can hit this
in a just a few hours.

Broken since 883a3acf5b0d4782ac35981227a0d094e8b44850
    [IA64] Re-implement spinaphores using ticket lock concepts

Reported via IRC by Bjorn Helgaas

Signed-off-by: Tony Luck <tony.luck@intel.com>
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