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 - 13:40:19 EST

On Tue, Nov 18, 2014 at 3:15 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> On x86, sleeping while on an IST or irq stack has a surprisingly
> good chance of working, but it can also fail dramatically. Add an
> arch hook to allow schedule and __might_sleep to catch sleeping on
> the wrong stack.

Why doesn't the normal in_interrupt() test catch this?

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