linux-kernel - Re: [PATCH 1/2] drm/vkms: Use index instead of 0 in possible crtc

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Message-ID: <WQuF2MGabt8DxA1rdWhTcZIGSaXav-5XOae4hkdkxq51gom6tklMqrfOLnyN6WSm9TY5sLXp_fxoNQhtC3E7zY9A3dLEpfZ1phdw23m0SI8=@emersion.fr>
Date:   Tue, 18 Jun 2019 05:18:01 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
Cc:     Brian Starkey <brian.starkey@....com>,
        Liviu Dudau <liviu.dudau@....com>,
        Haneen Mohammed <hamohammed.sa@...il.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] drm/vkms: Use index instead of 0 in possible crtc

On Tuesday, June 18, 2019 5:19 AM, Rodrigo Siqueira <rodrigosiqueiramelo@...il.com> wrote:
> I made the patch, but when I started to write the commit message, I just
> realized that I did not understand why possible_crtcs should not be
> equal zero. Why can we not use zero?

Hi,

possible_crtcs is a bitfield. If it's zero, it means the plane cannot
be attached to any CRTC, which makes it rather useless.

Thanks,

Simon