linux-kernel - Re: [PATCH] uapi glibc compat: fix outer guard of net device flags enum

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Date:   Mon, 5 Dec 2016 19:34:02 +0200
From:   Mikko Rapeli <mikko.rapeli@....fi>
To:     Jonas Gorski <jonas.gorski@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Zhang Shengju <zhangshengju@...s.chinamobile.com>
Subject: Re: [PATCH] uapi glibc compat: fix outer guard of net device flags
 enum

On Sat, Dec 03, 2016 at 05:31:45PM +0100, Jonas Gorski wrote:
> Fix a wrong condition preventing the higher net device flags
> IFF_LOWER_UP etc to be defined if net/if.h is included before
> linux/if.h.
> 
> The comment makes it clear the intention was to allow partial
> definition with either parts.
> 
> This fixes compilation of userspace programs trying to use
> IFF_LOWER_UP, IFF_DORMANT or IFF_ECHO.
> 
> Fixes: 4a91cb61bb99 ("uapi glibc compat: fix compile errors when glibc net/if.h included before linux/if.h")
> Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>

Reviewed-by: Mikko Rapeli <mikko.rapeli@....fi>

Yep, sorry about the logic error. Thanks for the fix!

-Mikko

> ---
> Patch applies cleanly to both linus' HEAD and net-next. I wasn't sure
> which one's the right one.
> 
>  include/uapi/linux/if.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/if.h b/include/uapi/linux/if.h
> index e601c8c..1158a04 100644
> --- a/include/uapi/linux/if.h
> +++ b/include/uapi/linux/if.h
> @@ -31,7 +31,7 @@
>  #include <linux/hdlc/ioctl.h>
>  
>  /* For glibc compatibility. An empty enum does not compile. */
> -#if __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO != 0 && \
> +#if __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO != 0 || \
>      __UAPI_DEF_IF_NET_DEVICE_FLAGS != 0
>  /**
>   * enum net_device_flags - &struct net_device flags
> @@ -99,7 +99,7 @@ enum net_device_flags {
>  	IFF_ECHO			= 1<<18, /* volatile */
>  #endif /* __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO */
>  };
> -#endif /* __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO != 0 && __UAPI_DEF_IF_NET_DEVICE_FLAGS != 0 */
> +#endif /* __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO != 0 || __UAPI_DEF_IF_NET_DEVICE_FLAGS != 0 */
>  
>  /* for compatibility with glibc net/if.h */
>  #if __UAPI_DEF_IF_NET_DEVICE_FLAGS
> -- 
> 2.1.4
>