linux-kernel - Re: [PATCH v2] checksyscalls: Ignore fstat to silence build warning on LoongArch

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Date:   Tue, 30 Aug 2022 10:54:54 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        Arnd Bergmann <arnd@...db.de>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] checksyscalls: Ignore fstat to silence build warning
 on LoongArch

On 2022/8/30 10:50, Tiezhu Yang wrote:
> fstat is replaced by statx on the new architecture, so an exception
> is added to the checksyscalls script to silence the following build
> warning on LoongArch:
> 
>    CALL    scripts/checksyscalls.sh
> <stdin>:569:2: warning: #warning syscall fstat not implemented [-Wcpp]
> 
> Suggested-by: WANG Xuerui <kernel@...0n.name>
> Suggested-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
> 
> Hi Xuerui and Arnd,
> 
> Thank you for your reviews and suggestions.
> 
> v2:
>    -- Change scripts/checksyscalls.sh
>    -- Modify patch subject and commit message
> 
>   scripts/checksyscalls.sh | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/scripts/checksyscalls.sh b/scripts/checksyscalls.sh
> index f33e61a..c0a093c 100755
> --- a/scripts/checksyscalls.sh
> +++ b/scripts/checksyscalls.sh
> @@ -114,7 +114,6 @@ cat << EOF
>   #define __IGNORE_truncate
>   #define __IGNORE_stat
>   #define __IGNORE_lstat
> -#define __IGNORE_fstat
>   #define __IGNORE_fcntl
>   #define __IGNORE_fadvise64
>   #define __IGNORE_newfstatat
> @@ -253,6 +252,7 @@ cat << EOF
>   #define __IGNORE_vserver
>   
>   /* 64-bit ports never needed these, and new 32-bit ports can use statx */
> +#define __IGNORE_fstat

This should not belong here, because some 64-bit ports apparently need 
fstat. Instead it should be its own block with some explanation like 
"Newer ports are not required to provide fstat in favor of statx".

>   #define __IGNORE_fstat64
>   #define __IGNORE_fstatat64
>   EOF

Otherwise LGTM, thanks!

-- 
WANG "xen0n" Xuerui

Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/