linux-kernel - Re: [PATCH 7/7] x86: Tell about irq stack coverage

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Message-Id: <20130925172121.00c23e416398139f4615943c@linux-foundation.org>
Date:	Wed, 25 Sep 2013 17:21:21 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@....ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	James Hogan <james.hogan@...tec.com>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	Helge Deller <deller@....de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Joe Perches <joe@...ches.com>
Subject: Re: [PATCH 7/7] x86: Tell about irq stack coverage

On Wed, 25 Sep 2013 16:08:20 -0700 Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Wed, Sep 25, 2013 at 9:18 AM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> > +#ifdef CONFIG_X86_64
> > +# define __ARCH_IRQ_EXIT_ON_IRQ_STACK
> > +#endif
> 
> Ok, see the previous email, this should just be a single
> 
>     select IRQ_EXIT_ON_IRQ_STACK
> 
> in under the "config X86_64" header in arch/x86/Kconfig.
> 
> And as of right now, this patch series should do it for Power too,
> since I just merged Ben's branch, which contained commit 0366a1c70b89
> ("powerpc/irq: Run softirqs off the top of the irq stack"). Again,
> just a single select in the arch/powerpc/Kconfig gile should be
> sufficient.
> 

This happens quite a lot.  Perhaps Joe can cook us up a checkpatch
rule.  "#define [__]ARCH_HA" looks like a decent search pattern.  

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