linux-kernel - Re: [PATCH] subpage_prot.2: SYNOPSIS: Fix return type: s/long/int/

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Date:   Sat, 28 Nov 2020 09:56:59 +0100
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Alejandro Colomar <alx.manpages@...il.com>
Cc:     mtk.manpages@...il.com, linux-man@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] subpage_prot.2: SYNOPSIS: Fix return type: s/long/int/

Hi Alex,

On 11/28/20 12:44 AM, Alejandro Colomar wrote:
> The Linux kernel uses 'int' instead of 'long' for the return type.
> As glibc provides no wrapper, use the same type the kernel uses.

Thanks. Patch applied.

Cheers,

Michael

> ......
> 
> $ grep -n wrapper man-pages/man2/subpage_prot.2
> 40:There is no glibc wrapper for this system call; see NOTES.
> 99:Glibc does not provide a wrapper for this system call; call it using
> 
> $ grep -rn SYSCALL_DEFINE.*subpage_prot linux/;
> linux/arch/powerpc/mm/book3s64/subpage_prot.c:190:
> SYSCALL_DEFINE3(subpage_prot, unsigned long, addr,
> 
> $ sed -n /SYSCALL.*subpage_prot/,/^}/p \
>   linux/arch/powerpc/mm/book3s64/subpage_prot.c \
>   |grep return;
> 		return -ENOENT;
> 		return -EINVAL;
> 		return -EINVAL;
> 		return 0;
> 		return -EFAULT;
> 			return -EFAULT;
> 	return err;
> 
> $ sed -n /SYSCALL.*subpage_prot/,/^}/p \
>   linux/arch/powerpc/mm/book3s64/subpage_prot.c \
>   |grep '\<err\>';
> 	int err;
> 			err = -ENOMEM;
> 		err = -ENOMEM;
> 	err = 0;
> 	return err;
> 
> Signed-off-by: Alejandro Colomar <alx.manpages@...il.com>
> ---
>  man2/subpage_prot.2 | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/man2/subpage_prot.2 b/man2/subpage_prot.2
> index b38ba718f..d6f016665 100644
> --- a/man2/subpage_prot.2
> +++ b/man2/subpage_prot.2
> @@ -32,7 +32,7 @@
>  subpage_prot \- define a subpage protection for an address range
>  .SH SYNOPSIS
>  .nf
> -.BI "long subpage_prot(unsigned long " addr ", unsigned long " len ,
> +.BI "int subpage_prot(unsigned long " addr ", unsigned long " len ,
>  .BI "                  uint32_t *" map );
>  .fi
>  .PP
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/