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

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Date:	Wed, 25 Sep 2013 16:04:28 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
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 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.

              Linus
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