linux-kernel - Re: [PATCH] drm/vmwgfx: avoid gcc-7 parentheses warning

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Date:   Wed, 16 Nov 2016 18:25:08 -0800
From:   Sinclair Yeh <syeh@...are.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Thomas Hellstrom <thellstrom@...are.com>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Brian Paul <brianp@...are.com>,
        Charmaine Lee <charmainel@...are.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/vmwgfx: avoid gcc-7 parentheses warning

Looks good to me, thanks!
I'll incorporate this into the next pull request.

Reviewed-by: Sinclair Yeh <syeh@...are.com>

On Wed, Nov 16, 2016 at 03:19:31PM +0100, Arnd Bergmann wrote:
> gcc-7 warns about slightly suspicious code in vmw_cmd_invalid:
> 
> drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c: In function 'vmw_cmd_invalid':
> drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c:522:23: error: the omitted middle operand in ?: will always be 'true', suggest explicit middle operand [-Werror=parentheses]
> 
> The problem is that it is mixing boolean and integer values here.
> I assume that the code actually works correctly, so making it use
> a literal '1' instead of the implied 'true' makes it more readable
> and avoids the warning.
> 
> The code has been in this file since the start, but it could
> make sense to backport this patch to stable to make it build cleanly
> with gcc-7.
> 
> Fixes: fb1d9738ca05 ("drm/vmwgfx: Add DRM driver for VMware Virtual GPU")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
> index c7b53d987f06..3f343e55972a 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
> @@ -519,7 +519,7 @@ static int vmw_cmd_invalid(struct vmw_private *dev_priv,
>  			   struct vmw_sw_context *sw_context,
>  			   SVGA3dCmdHeader *header)
>  {
> -	return capable(CAP_SYS_ADMIN) ? : -EINVAL;
> +	return capable(CAP_SYS_ADMIN) ? 1 : -EINVAL;
>  }
>  
>  static int vmw_cmd_ok(struct vmw_private *dev_priv,
> -- 
> 2.9.0
>