linux-kernel - Re: [PATCH] uapi: fix linux/btrfs.h userspace compilation error

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Date:   Wed, 15 Feb 2017 12:36:11 -0800
From:   Joe Perches <joe@...ches.com>
To:     "Dmitry V. Levin" <ldv@...linux.org>,
        David Sterba <dsterba@...e.com>, Josef Bacik <jbacik@...com>,
        Jeff Mahoney <jeffm@...e.com>, Liu Bo <bo.li.liu@...cle.com>,
        Anand Jain <anand.jain@...cle.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uapi: fix linux/btrfs.h userspace compilation error

On Wed, 2017-02-15 at 23:02 +0300, Dmitry V. Levin wrote:
> Stop using NULL to fix the following linux/btrfs.h userspace compilation
> error:
> 
> /usr/include/linux/btrfs.h: In function 'btrfs_err_str':
> /usr/include/linux/btrfs.h:740:11: error: 'NULL' undeclared (first use in this function)
>     return NULL;
> 
> Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
> ---
>  include/uapi/linux/btrfs.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
[]
> @@ -737,7 +737,7 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code)
>  			return "add/delete/balance/replace/resize operation "\
>  				"in progress";
>  		default:
> -			return NULL;
> +			return 0;

Perhaps to avoid some other warnings this might be better

	return (void *)0;