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[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.  ;-)
This commit is contained in:
Ivan Kokshaysky 2005-06-30 20:02:18 +04:00 committed by Linus Torvalds
parent 62351cc38d
commit eaf05be039
1 changed files with 1 additions and 1 deletions
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2
arch/alpha/kernel/traps.c
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@ -240,7 +240,7 @@ do_entIF(unsigned long type, struct pt_regs *regs)
siginfo_t info;
int signo, code;
if (regs->ps == 0) {
if ((regs->ps & ~IPL_MAX) == 0) {
if (type == 1) {
const unsigned int *data
= (const unsigned int *) regs->pc;