Re: [PATCH v3 3/3] sched, x86: Check that we're on the right stack in schedule and __might_sleep
From: Linus Torvalds
Date: Wed Nov 19 2014 - 18:59:21 EST
On Wed, Nov 19, 2014 at 3:49 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> My only real objection is that it's going to be ugly and error prone.
> It'll have to be something like:
> because the whole point of this series is to make the IST entries not
> be atomic when they come from userspace.
Andy, you need to lay off the drugs.
NMI absolutely *has* to be atomic. The whole "oh, there's a per-core
NMI flag and it disables all other NMI's and interrupts" kind of
Trust me. Talking about being able to preempt the NMI handler is just
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