linux-kernel - Re: [PATCH v3 0/1] waitid: process group enhancement

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Date:   Wed, 14 Aug 2019 18:13:51 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Rich Felker <dalias@...c.org>
Cc:     linux-kernel@...r.kernel.org, libc-alpha@...rceware.org,
        oleg@...hat.com, alistair23@...il.com, ebiederm@...ssion.com,
        arnd@...db.de, torvalds@...ux-foundation.org,
        adhemerval.zanella@...aro.org, fweimer@...hat.com,
        palmer@...ive.com, macro@....com, zongbox@...il.com,
        akpm@...ux-foundation.org, viro@...iv.linux.org.uk, hpa@...or.com
Subject: Re: [PATCH v3 0/1] waitid: process group enhancement

On Wed, Aug 14, 2019 at 11:58:22AM -0400, Rich Felker wrote:
> On Wed, Aug 14, 2019 at 05:43:59PM +0200, Christian Brauner wrote:
> > Hey everyone,
> > 
> > This patch adds support for waiting on the current process group by
> > specifying waitid(P_PGID, 0, ...) as discussed in [1]. The details why
> > we need to do this are in the commit message of [PATCH 1/1] so I won't
> > repeat them here.
> > 
> > I've picked this up since the thread has gone stale and parts of
> > userspace are actually blocked by this.
> > 
> > Note that the patch has been changed to be more closely aligned with the
> > P_PIDFD changes to waitid() I have sitting in my for-next branch (cf. [2]).
> > This makes the merge conflict a little simpler and picks up on the
> > coding style discussions that guided the P_PIDFD patchset.
> > 
> > There was some desire to get this feature in with 5.3 (cf. [3]).
> > But given that this is a new feature for waitid() and for the sake of
> > avoiding any merge conflicts I would prefer to land this in the 5.4
> > merge window together with the P_PIDFD changes.
> 
> That makes 5.4 (or later, depending on other stuff) the hard minimum
> for RV32 ABI. Is that acceptable? I was under the impression (perhaps
> mistaken) that 5.3 was going to be next LTS series which is why I'd
> like to have the necessary syscalls for a complete working RV32
> userspace in it. If I'm wrong about that please ignore me. :-)

5.3 is not going to be an LTS and we don't do new features after the
merge window is closed anyway. :)

Christian