Re: [PATCH v3 13/14] lib/zstd: Convert constants to defines

[Nikolay Borisov <nborisov@suse.com>]

Nick,

Can we get your ACK for the below changes. THey don't seem to be used
outside of core zstd code, yet they result in warnings in code which
includes zstd.h. By switching them to defines we don't lose anything.

On 22.01.21 г. 11:58 ч., Nikolay Borisov wrote:
> Those constants are really used internally by zstd and including
> linux/zstd.h into users results in the following warnings:
> 
> In file included from fs/btrfs/zstd.c:19:
> ./include/linux/zstd.h:798:21: warning: ‘ZSTD_skippableHeaderSize’ defined but not used [-Wunused-const-variable=]
>   798 | static const size_t ZSTD_skippableHeaderSize = 8;
>       |                     ^~~~~~~~~~~~~~~~~~~~~~~~
> ./include/linux/zstd.h:796:21: warning: ‘ZSTD_frameHeaderSize_max’ defined but not used [-Wunused-const-variable=]
>   796 | static const size_t ZSTD_frameHeaderSize_max = ZSTD_FRAMEHEADERSIZE_MAX;
>       |                     ^~~~~~~~~~~~~~~~~~~~~~~~
> ./include/linux/zstd.h:795:21: warning: ‘ZSTD_frameHeaderSize_min’ defined but not used [-Wunused-const-variable=]
>   795 | static const size_t ZSTD_frameHeaderSize_min = ZSTD_FRAMEHEADERSIZE_MIN;
>       |                     ^~~~~~~~~~~~~~~~~~~~~~~~
> ./include/linux/zstd.h:794:21: warning: ‘ZSTD_frameHeaderSize_prefix’ defined but not used [-Wunused-const-variable=]
>   794 | static const size_t ZSTD_frameHeaderSize_prefix = 5;
> 
> So fix those warnings by turning the constants into defines.
> 
> Signed-off-by: Nikolay Borisov <nborisov@suse.com>
> ---
>  include/linux/zstd.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/zstd.h b/include/linux/zstd.h
> index 249575e2485f..e87f78c9b19c 100644
> --- a/include/linux/zstd.h
> +++ b/include/linux/zstd.h
> @@ -791,11 +791,11 @@ size_t ZSTD_DStreamOutSize(void);
>  /* for static allocation */
>  #define ZSTD_FRAMEHEADERSIZE_MAX 18
>  #define ZSTD_FRAMEHEADERSIZE_MIN  6
> -static const size_t ZSTD_frameHeaderSize_prefix = 5;
> -static const size_t ZSTD_frameHeaderSize_min = ZSTD_FRAMEHEADERSIZE_MIN;
> -static const size_t ZSTD_frameHeaderSize_max = ZSTD_FRAMEHEADERSIZE_MAX;
> +#define ZSTD_frameHeaderSize_prefix 5
> +#define ZSTD_frameHeaderSize_min ZSTD_FRAMEHEADERSIZE_MIN
> +#define ZSTD_frameHeaderSize_max ZSTD_FRAMEHEADERSIZE_MAX
>  /* magic number + skippable frame length */
> -static const size_t ZSTD_skippableHeaderSize = 8;
> +#define ZSTD_skippableHeaderSize 8
>  
>  
>  /*-*************************************
>