linux-kernel - Re: [PATCH percpu/for-3.18-fixes] s390: fix machine check regression caused by the conversion from __get_cpu_var() to this_cpu

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Date:	Tue, 2 Dec 2014 18:32:28 +0100 (CET)
From:	Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Christoph Lameter <cl@...ux.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH percpu/for-3.18-fixes] s390: fix machine check regression
 caused by the conversion from __get_cpu_var() to this_cpu_ptr()

On Tue, 2 Dec 2014, Tejun Heo wrote:
> Sorry about the delay.  Was on vacation.
> 
> Patch applied to percpu/for-3.18-fixes w/ minor updates to the patch
> subject and description.  Will push out to Linus soon.
> 

I've seen that Martin took the patch and it's already in Linus' tree -
commit 2cb4a18262fd0108cb8abd875710c59d0aa66f1d

Regards,
Sebastian

> Thanks.
> 
>  arch/s390/kernel/nmi.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c
> index dd1c24c..3f51cf4 100644
> --- a/arch/s390/kernel/nmi.c
> +++ b/arch/s390/kernel/nmi.c
> @@ -54,12 +54,8 @@ void s390_handle_mcck(void)
>  	 */
>  	local_irq_save(flags);
>  	local_mcck_disable();
> -	/*
> -	 * Ummm... Does this make sense at all? Copying the percpu struct
> -	 * and then zapping it one statement later?
> -	 */
> -	memcpy(&mcck, this_cpu_ptr(&cpu_mcck), sizeof(mcck));
> -	memset(&mcck, 0, sizeof(struct mcck_struct));
> +	mcck = *this_cpu_ptr(&cpu_mcck);
> +	memset(this_cpu_ptr(&cpu_mcck), 0, sizeof(mcck));
>  	clear_cpu_flag(CIF_MCCK_PENDING);
>  	local_mcck_enable();
>  	local_irq_restore(flags);
> -- 
> 2.1.0
> 
> 

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