Re: [PATCH] RDS: IB: Use DEFINE_PER_CPU_SHARED_ALIGNED for rds_ib_stats

[Santosh Shilimkar]

On 9/21/2018 11:04 AM, 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@xxxxxxxxx>
> ---
Looks fine. Thanks !!

Acked-by: Santosh Shilimkar <santosh.shilimkar@xxxxxxxxxx>