linux-kernel - Re: [PATCH] samples: make pidfd-metadata fail gracefully on older kernels

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Message-ID: <20190623113230.GC20697@altlinux.org>
Date:   Sun, 23 Jun 2019 14:32:30 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Christian Brauner <christian@...uner.io>
Cc:     Jann Horn <jannh@...gle.com>, Oleg Nesterov <oleg@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] samples: make pidfd-metadata fail gracefully on older
 kernels

On Sat, Jun 22, 2019 at 12:13:39AM +0200, Christian Brauner wrote:
[...]
> Out of curiosity: what makes the new flag different than say
> CLONE_NEWCGROUP or any new clone flag that got introduced?
> CLONE_NEWCGROUP too would not be detectable apart from the method I gave
> you above; same for other clone flags. Why are you so keen on being able
> to detect this flag when other flags didn't seem to matter that much.

I wasn't following uapi changes closely enough those days. ;)


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