linux-kernel - Re: [PATCH v2] s390/cpum_cf: Remove superfluous SMP function call

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Date:	Mon, 2 May 2016 12:43:05 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Anna-Maria Gleixner <anna-maria@...utronix.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, rt@...utronix.de,
	linux-s390@...r.kernel.org
Subject: Re: [PATCH v2] s390/cpum_cf: Remove superfluous SMP function call

On Mon, May 02, 2016 at 10:59:32AM +0200, Anna-Maria Gleixner wrote:
> Since commit 3b9d6da67e11 ("cpu/hotplug: Fix rollback during error-out
> in __cpu_disable()") it is ensured that callbacks of CPU_ONLINE and
> CPU_DOWN_PREPARE are processed on the hotplugged CPU. Due to this SMP
> function calls are no longer required.
> 
> Replace smp_call_function_single() with a direct call of
> setup_pmc_cpu(). To keep the calling convention, interrupts are
> explicitly disabled around the call.
> 
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: linux-s390@...r.kernel.org
> Signed-off-by: Anna-Maria Gleixner <anna-maria@...utronix.de>
> ---
> Changes in v2:
> 	- Adapt referenced commit in commit message
> 
>  arch/s390/kernel/perf_cpum_cf.c |    9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>

Martin, can you pick this patch up?