tree da81bed900c4a80f53379feb2de477fc4047792c
parent 62351cc38d3eaf3de0327054dd6ebc039f4da80d
author Ivan Kokshaysky <ink@jurassic.park.msu.ru> 1120147338 +0400
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1120195788 -0700

[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.  ;-)