Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: PCI PM: Restore standard config registers of all devices early | Date | Tue, 3 Feb 2009 00:00:17 +0100 |
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On Monday 02 February 2009, Benjamin Herrenschmidt wrote: > On Mon, 2009-02-02 at 14:05 -0800, Linus Torvalds wrote: > > Well, I don't think anybody wants to (or necessarily has the ability) > > touch ACPI internals. > > > Somebody has a rough idea of what underlying kernel support ACPI uses ? > I know from discussions with Len that it's mostly mutexes... timers > too ?
Please see my last message in this thread (just sent).
> It might end up being trivial to make it safe to call early with > interrupts off with the trick you mentioned, since it's really just the > same as boot as you mentioned.. ie, it's actually safe to take mutexes > etc... since we -know- no other CPU is running and we aren't scheduling > etc...
But we can't tell no one is holding the mutex in question, AFAICS.
I'm afraid we'd really need a special "no mutexes, no GFP_KERNEL allocations" code path for that.
Thanks, Rafael
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