linux-kernel - Re: [PATCH, RESEND 03/14] drm/vmwgfx: avoid gcc-7 parentheses warning

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Date:   Fri, 14 Jul 2017 12:23:15 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        VMware Graphics <linux-graphics-maintainer@...are.com>,
        Sinclair Yeh <syeh@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, Guenter Roeck <linux@...ck-us.net>,
        IDE-ML <linux-ide@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        DRI <dri-devel@...ts.freedesktop.org>,
        Brian Paul <brianp@...are.com>
Subject: Re: [PATCH, RESEND 03/14] drm/vmwgfx: avoid gcc-7 parentheses warning

On Fri, Jul 14, 2017 at 12:21 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> NAK. This takes unintentionally insane code and turns it intentionally
> insane. Any non-zero return is considered an error.
>
> The right fix is almost certainly to just return -EINVAL unconditionally.

Btw, this is why I hate compiler warning fix patch series. Even when
they don't actually break the code (and sometimes they do that too),
they can actually end up making the code worse.

The *intent* of that code was to return zero for the CAP_SYS_ADMIN.
But the code has never done that in its lifetime and nobody ever
noticed, so clearly the code shouldn't even have tried.

                    Linus