linux-kernel - Re: [PATCH 07/12] s390: cio: fix cio

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Date:   Mon, 8 Apr 2019 15:35:20 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Sebastian Ott <sebott@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/12] s390: cio: fix cio_irb declaration

On Mon, Apr 08, 2019 at 11:26:20PM +0200, Arnd Bergmann wrote:
> clang points out that the declaration of cio_irb does not match the
> definition exactly, it is missing the alignment attribute:
> 
> ../drivers/s390/cio/cio.c:50:1: warning: section does not match previous declaration [-Wsection]
> DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);
> ^
> ../include/linux/percpu-defs.h:150:2: note: expanded from macro 'DEFINE_PER_CPU_ALIGNED'
>         DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION)     \
>         ^
> ../include/linux/percpu-defs.h:93:9: note: expanded from macro 'DEFINE_PER_CPU_SECTION'
>         extern __PCPU_ATTRS(sec) __typeof__(type) name;                 \
>                ^
> ../include/linux/percpu-defs.h:49:26: note: expanded from macro '__PCPU_ATTRS'
>         __percpu __attribute__((section(PER_CPU_BASE_SECTION sec)))     \
>                                 ^
> ../drivers/s390/cio/cio.h:118:1: note: previous attribute is here
> DECLARE_PER_CPU(struct irb, cio_irb);
> ^
> ../include/linux/percpu-defs.h:111:2: note: expanded from macro 'DECLARE_PER_CPU'
>         DECLARE_PER_CPU_SECTION(type, name, "")
>         ^
> ../include/linux/percpu-defs.h:87:9: note: expanded from macro 'DECLARE_PER_CPU_SECTION'
>         extern __PCPU_ATTRS(sec) __typeof__(type) name
>                ^
> ../include/linux/percpu-defs.h:49:26: note: expanded from macro '__PCPU_ATTRS'
>         __percpu __attribute__((section(PER_CPU_BASE_SECTION sec)))     \
>                                 ^
> Use DECLARE_PER_CPU_ALIGNED() here, to make the two match.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  drivers/s390/cio/cio.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
> index 9811fd8a0c73..92eabbb5f18d 100644
> --- a/drivers/s390/cio/cio.h
> +++ b/drivers/s390/cio/cio.h
> @@ -115,7 +115,7 @@ struct subchannel {
>  	struct schib_config config;
>  } __attribute__ ((aligned(8)));
>  
> -DECLARE_PER_CPU(struct irb, cio_irb);
> +DECLARE_PER_CPU_ALIGNED(struct irb, cio_irb);
>  
>  #define to_subchannel(n) container_of(n, struct subchannel, dev)
>  
> -- 
> 2.20.0
>