linux-kernel - Re: [PATCH v3] kcmp: Support selection of SYS_kcmp without CHECKPOINT

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Message-ID: <20210206124732.GK2172@grain>
Date:   Sat, 6 Feb 2021 15:47:32 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
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>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        stable@...r.kernel.org, Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [PATCH v3] kcmp: Support selection of SYS_kcmp without
 CHECKPOINT_RESTORE

On Fri, Feb 05, 2021 at 10:00:12PM +0000, Chris Wilson wrote:
> 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.
> 
...
Reviewed-by: Cyrill Gorcunov <gorcunov@...il.com>