linux-kernel - Re: [PATCH v2] RDS: IB: Use DECLARE_PER_CPU_SHARED_ALIGNED for rds_ib

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Date:   Sun, 23 Sep 2018 00:39:55 -0700
From:   "santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2] RDS: IB: Use DECLARE_PER_CPU_SHARED_ALIGNED for
 rds_ib_stats

On 9/22/18 8:29 PM, Nathan Chancellor wrote:
> Clang warns when two declarations' section attributes don't match.
> 
> net/rds/ib_stats.c:40:1: warning: section does not match previous
> declaration [-Wsection]
> DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
> ^
> ./include/linux/percpu-defs.h:142:2: note: expanded from macro
> 'DEFINE_PER_CPU_SHARED_ALIGNED'
>          DEFINE_PER_CPU_SECTION(type, name,
> PER_CPU_SHARED_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)))
> \
>                                  ^
> net/rds/ib.h:446:1: note: previous attribute is here
> DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
> ^
> ./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)))
> \
>                                  ^
> 1 warning generated.
> 
> The initial definition was added in commit ec16227e1414 ("RDS/IB:
> Infiniband transport") and the cache aligned definition was added in
> commit e6babe4cc4ce ("RDS/IB: Stats and sysctls") right after. The
> definition probably should have been updated in net/rds/ib.h, which is
> what this patch does.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/114
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
> 
> v1 -> v2:
> 
> Fix reported build error by using DECLARE instead of DEFINE
> 
Thanks for update !!
Acked-by: Santosh shilimkar <santosh.shilimkar@...cle.com>