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Date:   Sat, 13 Feb 2021 18:40:00 +0100
From:   Pavel Machek <pavel@ucw.cz>
To:     Chris Wilson <chris@chris-wilson.co.uk>
Cc:     linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        intel-gfx@lists.freedesktop.org, Kees Cook <keescook@chromium.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Will Drewry <wad@chromium.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Dave Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Lucas Stach <l.stach@pengutronix.de>
Subject: Re: [PATCH] kernel: Expose SYS_kcmp by default
Message-ID: <20210213174000.GA31409@duo.ucw.cz>
References: <20210205163752.11932-1-chris@chris-wilson.co.uk>
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Hi!

> Userspace has discovered the functionality offered by SYS_kcmp and has
> started to depend upon it. In particular, Mesa uses SYS_kcmp for
> os_same_file_description() in order to identify when two fd (e.g. device
> or dmabuf) point to the same struct file. Since they depend on it for
> core functionality, lift SYS_kcmp out of the non-default
> CONFIG_CHECKPOINT_RESTORE into the selectable syscall category.

Is it good idea to enable everything because Mesa uses it for file
descriptors?

This is really interesting syscall...

Best regards,
								Pavel

--=20
http://www.livejournal.com/~pavelmachek

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