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> Tony: >> Ingo: >> tested on x86, and all other arches should work as well, but if an >> architecture has irqs-off assumptions in its switch_to() logic it >> might break. (I havent found any but there may such assumptions.) > 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! --david - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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