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+55aFwa6+kt0rGeQ1YX2qkwTMyAsEgWAtkN86Nap1ROJyjmog@mail.gmail.com>
Date:	Wed, 19 Nov 2014 15:42:25 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>,
	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>
Subject: Re: [PATCH v3 3/3] sched, x86: Check that we're on the right stack in
 schedule and __might_sleep

On Wed, Nov 19, 2014 at 3:32 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
>
> preempt_count is a per cpu variable at least on x86 since:

Oh, goodie. I hadn't tracked that it went in, I just remembered the
discussion. I should have looked.

And apparently we do it in nmi_enter too, so NMI is already ok. Don't
know about the others.

                Linus
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