linux-kernel - Re: [PATCH 6/7] irq: Optimize softirq stack selection in irq exit

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Message-ID: <20130926071204.GA18570@localhost.localdomain>
Date:	Thu, 26 Sep 2013 09:12:12 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 6/7] irq: Optimize softirq stack selection in irq exit

On Wed, Sep 25, 2013 at 04:04:28PM -0700, Linus Torvalds wrote:
> On Wed, Sep 25, 2013 at 9:18 AM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> > +#ifdef __ARCH_IRQ_EXIT_ON_IRQ_STACK
> 
> Please don't introduce anymore of these insane ad-hoc crazy architecture macros.
> 
> Just make it a regular config option, which makes it much easier for
> architectures to just select it at config time.
> 
> So make it something like CONFIG_IRQ_EXIT_ON_IRQ_STACK, and then
> x86-64 (and now Power) can just do
> 
>     select IRQ_EXIT_ON_IRQ_STACK
> 
> in their arch/*/Kconfig files.
> 
> Basically, we really should strive to get rid of all those insane
> [__]ARCH_xyzzy flags. We have too many of them, and they are insane.

Ok, I'll convert that and x86,powerpc along.

Thanks.

> 
>               Linus
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