tree 261d8cd77fad2d661157ee5e5bde8e3fdc8c96b9
parent bd0765098bf22eb8b1319f649a4c3301b40ec04c
author Kevin D. Kissell <kevink@mips.com> 1184253668 +0100
committer Ralf Baechle <ralf@linux-mips.org> 1184258477 +0100

[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>