linux-kernel - Re: linux-next: build failure after merge of the amdgpu tree

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Message-ID: <I4IG-HGTQl3WHcdp7MrnMOrQZwL4HhudvbFPBKneSpZGbC20QrEL4YaO7H4YDaQvfpG1vkzovugRwgV_Qu5DMDQoCbdCK2SRESC2yoP1T3Y=@emersion.fr>
Date:   Mon, 11 Oct 2021 08:21:41 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Christoph Hellwig <hch@....de>
Cc:     Alex Deucher <alexdeucher@...il.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: linux-next: build failure after merge of the amdgpu tree

On Monday, October 11th, 2021 at 10:01, Christoph Hellwig <hch@....de> wrote:

> On Mon, Oct 11, 2021 at 07:57:17AM +0000, Simon Ser wrote:
> > No, we can't have a "I_AM_NOT_BROKEN" ioctl for each and every uAPI mis-use.
> > User-space detection has been determined to be the best course of action.
>
> If your API addition breaks userspace, yes you need an add-in.

It's not an API addition. It's a ChromeOS fix that breaks my user-space.

> With your completely broken change you cement in a mapping of an executable
> name to map to what you consider a "bug" without any way to fix it up.

If that's the only concern, it'd be very easy to add a CAP_ATOMIC >= 2 check
like we have for Xorg. This would make it so ChromeOS can eventually opt-out
of the quirk.