From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Date: Thu, 30 Jun 2005 16:02:18 +0000 (+0400)
Subject: [PATCH] alpha smp fix
X-Git-Tag: v2.6.13-rc2~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=eaf05be039cf5adfba5b1846452ce89646110fdb;p=pandora-kernel.git

[PATCH] alpha smp fix

As usual, the reason of this breakage is quite silly: in do_entIF, we
are checking for PS == 0 to see whether it was a kernel BUG() or
userspace trap.

It works, unless BUG() happens in interrupt - PS is not 0 in kernel mode
due to non-zero IPL, and the things get messed up horribly then.  In
this particular case it was BUG_ON(!irqs_disabled()) triggered in
run_posix_cpu_timers(), so we ended up shooting "current" with the
bursts of one SIGTRAP and three SIGILLs on every timer tick.  ;-)
---

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