linux-kernel - Re: [PATCH] kernel: Expose SYS

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Message-ID: <20210213174000.GA31409@duo.ucw.cz>
Date:   Sat, 13 Feb 2021 18:40:00 +0100
From:   Pavel Machek <pavel@....cz>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH] kernel: Expose SYS_kcmp by default

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

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

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