linux-kernel - Re: [PATCH 8/8] powerpc: Tell about irq stack coverage

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Date:	Fri, 27 Sep 2013 08:20:46 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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 8/8] powerpc: Tell about irq stack coverage

On Thu, 2013-09-26 at 18:24 +0200, Frederic Weisbecker wrote:
> Now that powerpc runs irq_exit() under the irq stack,
> let the softirq core know about that so that we spare
> the needless stack switch on irq exit's softirq processing.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc:

>  Paul Mackerras <paulus@....ibm.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Paul Mackerras <paulus@....ibm.com>
> Cc: James Hogan <james.hogan@...tec.com>
> Cc: James E.J. Bottomley <jejb@...isc-linux.org>
> Cc: Helge Deller <deller@....de>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> ---
>  arch/powerpc/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 38f3b7e..b365d5c 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -138,6 +138,7 @@ config PPC
>  	select OLD_SIGSUSPEND
>  	select OLD_SIGACTION if PPC32
>  	select HAVE_DEBUG_STACKOVERFLOW
> +	select HAVE_IRQ_EXIT_ON_IRQ_STACK
>  
>  config EARLY_PRINTK
>  	bool


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