>>>>> On Sat, 9 Apr 2005 09:07:38 +0200, Ingo Molnar <[EMAIL PROTECTED]> said:
Ingo> * David Mosberger-Tang <[EMAIL PROTECTED]> wrote: >> > The ia64_switch_to() code includes a section that can change a >> > pinned MMU mapping (when the stack for the new process is in a >> > different granule from the stack for the old process). The code >> > beyond the ".map" label in arch/ia64/kernel/entry.S includes the >> > comment: >> Also, there was a nasty dead-lock that could trigger if the >> context-switch was interrupted by a TLB flush IPI. I don't >> remember the details offhand, but I'm pretty sure it had to do >> with switch_mm(), so I suspect it may not be enough to disable >> irqs just for ia64_switch_to(). Tread with care! Ingo> we'll see. The patch certainly needs more testing. Generally Ingo> we do switch_mm()'s outside of the scheduler as well, without Ingo> disabling interrupts. Yes, of course. The deadlock was due to context-switching, not switch_mm() per se. Hopefully someone else beats me to remembering the details before Monday. --david - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/