linux-kernel - Re: [PATCH v3 3/3] sched, x86: Check that we're on the right stack in schedule and __might

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Message-ID: <CA+55aFztsw6Vt4CyVs1OsqdKXxQmFrxHdE7z89VMZ_1KwKPcmQ@mail.gmail.com>
Date:	Wed, 19 Nov 2014 10:40:10 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Borislav Petkov <bp@...en8.de>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v3 3/3] sched, x86: Check that we're on the right stack in
 schedule and __might_sleep

On Tue, Nov 18, 2014 at 3:15 PM, Andy Lutomirski <luto@...capital.net> 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?

          Linus
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