From: Kevin D. Kissell <kevink@mips.com>
Date: Thu, 12 Jul 2007 15:21:08 +0000 (+0100)
Subject: [MIPS] SMTC: Interrupt mask backstop hack
X-Git-Tag: v2.6.23-rc1~1110^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0db34215c7e0ef618e7b29fbf271194ca5434f8e;p=pandora-kernel.git

[MIPS] SMTC: Interrupt mask backstop hack

To support multiple TC microthreads acting as "CPUs" within a VPE,
VPE-wide interrupt mask bits must be specially manipulated during
interrupt handling. To support legacy drivers and interrupt controller
management code, SMTC has a "backstop" to track and if necessary restore
the interrupt mask. This has some performance impact on interrupt service
overhead. Disable it only if you know what you are doing.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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