linux-kernel - Re: [RFC PATCH 04/35] syscalls: do not call sys

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Message-ID: <20180312083517.GA11010@infradead.org>
Date:   Mon, 12 Mar 2018 01:35:17 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Dominik Brodowski <linux@...inikbrodowski.net>
Cc:     linux-kernel@...r.kernel.org, luto@...nel.org,
        torvalds@...ux-foundation.org, mingo@...nel.org,
        viro@...iv.linux.org.uk, akpm@...ux-foundation.org
Subject: Re: [RFC PATCH 04/35] syscalls: do not call sys_getpgid() within the
 kernel

The subject (and lack of description) for this and the following patches
is rather confusing.

I'd expect something like:

---- snip ----
Subject: kernel: add a do_getpgid helper

And use it to avoid an in-kernel sys_getpgid call.

---- snip ----

instead.

On Sun, Mar 11, 2018 at 11:55:26AM +0100, Dominik Brodowski wrote:
> CC: Al Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
> ---
>  kernel/sys.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/sys.c b/kernel/sys.c
> index f2289de20e19..ebb138b841c8 100644
> --- a/kernel/sys.c
> +++ b/kernel/sys.c
> @@ -1027,7 +1027,7 @@ SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
>  	return err;
>  }
>  
> -SYSCALL_DEFINE1(getpgid, pid_t, pid)
> +static int do_getpgid(pid_t pid)
>  {
>  	struct task_struct *p;
>  	struct pid *grp;
> @@ -1055,11 +1055,16 @@ SYSCALL_DEFINE1(getpgid, pid_t, pid)
>  	return retval;
>  }
>  
> +SYSCALL_DEFINE1(getpgid, pid_t, pid)
> +{
> +	return do_getpgid(pid);
> +}
> +
>  #ifdef __ARCH_WANT_SYS_GETPGRP
>  
>  SYSCALL_DEFINE0(getpgrp)
>  {
> -	return sys_getpgid(0);
> +	return do_getpgid(0);
>  }
>  
>  #endif
> -- 
> 2.16.2
> 
---end quoted text---