linux-kernel - Re: linux-next: manual merge of the percpu tree with the asm-generic tree

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Date:   Tue, 27 Sep 2016 21:59:32 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Tejun Heo <tj@...nel.org>, Rusty Russell <rusty@...tcorp.com.au>,
        Christoph Lameter <cl@...ux-foundation.org>,
        Ingo Molnar <mingo@...e.hu>, linux-next@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chunyan Zhang <zhang.chunyan@...aro.org>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: linux-next: manual merge of the percpu tree with the asm-generic tree

On Tuesday 27 September 2016, Stephen Rothwell wrote:
> diff --cc include/asm-generic/percpu.h
> index 70fefec69e61,40e887068da2..000000000000
> --- a/include/asm-generic/percpu.h
> +++ b/include/asm-generic/percpu.h
> @@@ -108,9 -118,9 +118,9 @@@ do {                                                                       
>   #define this_cpu_generic_read(pcp)                                    \
>   ({                                                                    \
>         typeof(pcp) __ret;                                              \
>  -      preempt_disable();                                              \
>  +      preempt_disable_notrace();                                      \
> -       __ret = *this_cpu_ptr(&(pcp));                                  \
> +       __ret = raw_cpu_generic_read(pcp);                              \
>  -      preempt_enable();                                               \
>  +      preempt_enable_notrace();                                       \
>         __ret;                                                          \
>   })
>   

The merge solution seems correct, but this is one of only two trivial
patches I have queued up for asm-generic this time, so I wonder if we could
put the _notrace patch into the percpu tree that already has the
raw_cpu_generic_read change to avoid the conflict.

	Arnd