linux-kernel - Re: [PATCH 16/17] init: open code setting up stdin/stdout/stderr

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Date:   Thu, 9 Jul 2020 14:32:54 -0400
From:   Brian Gerst <brgerst@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Song Liu <song@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-raid@...r.kernel.org,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 16/17] init: open code setting up stdin/stdout/stderr

On Thu, Jul 9, 2020 at 11:19 AM Christoph Hellwig <hch@....de> wrote:
>
> Don't rely on the implicit set_fs(KERNEL_DS) for ksys_open to work, but
> instead open a struct file for /dev/console and then install it as FD
> 0/1/2 manually.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  fs/file.c                |  7 +------
>  include/linux/syscalls.h |  1 -
>  init/main.c              | 16 ++++++++++------
>  3 files changed, 11 insertions(+), 13 deletions(-)
>
> diff --git a/fs/file.c b/fs/file.c
> index abb8b7081d7a44..85b7993165dd2f 100644
> --- a/fs/file.c
> +++ b/fs/file.c
> @@ -985,7 +985,7 @@ SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd)
>         return ksys_dup3(oldfd, newfd, 0);
>  }
>
> -int ksys_dup(unsigned int fildes)
> +SYSCALL_DEFINE1(dup, unsigned int, fildes)
>  {
>         int ret = -EBADF;
>         struct file *file = fget_raw(fildes);
> @@ -1000,11 +1000,6 @@ int ksys_dup(unsigned int fildes)
>         return ret;
>  }
>
> -SYSCALL_DEFINE1(dup, unsigned int, fildes)
> -{
> -       return ksys_dup(fildes);
> -}
> -

Please split the removal of the now unused ksys_*() functions into a
separate patch.

--
Brian Gerst