linux-kernel - Re: [PATCH] tools/memory-model: Add atomic_and()/or()/xor() and add

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Date: Wed, 8 May 2024 16:46:35 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Akira Yokosawa <akiyks@...il.com>
Cc: Boqun Feng <boqun.feng@...il.com>, Puranjay Mohan <puranjay@...nel.org>,
	Luc Maranget <luc.maranget@...ia.fr>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrea Parri <parri.andrea@...il.com>,
	Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nicholas Piggin <npiggin@...il.com>,
	David Howells <dhowells@...hat.com>,
	Jade Alglave <j.alglave@....ac.uk>,
	Daniel Lustig <dlustig@...dia.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	puranjay12@...il.com
Subject: Re: [PATCH] tools/memory-model: Add atomic_and()/or()/xor() and
 add_negative

On Thu, May 09, 2024 at 06:59:17AM +0900, Akira Yokosawa wrote:
> On Wed, 8 May 2024 12:49:57 -0700, Boqun Feng wrote:
> > On Wed, May 08, 2024 at 02:34:00PM +0000, Puranjay Mohan wrote:
> >> Pull-849[1] added the support of '&', '|', and '^' to the herd7 tool's
> >> atomics operations.
> >>
> >> Use these in linux-kernel.def to implement atomic_and()/or()/xor() with
> >> all their ordering variants.
> >>
> >> atomic_add_negative() is already available so add its acquire, release,
> >> and relaxed ordering variants.
> >>
> >> [1] https://github.com/herd/herdtools7/pull/849
> > 
> > A newer version of herd is required for this feature, right?
> 
> Yes, this requires building herd7 from latest source.
> 
> herdtools7 7.57 (released recently) happened before pull 849.
> 
> Luc, what is your plan on a next release (7.57.1?) ?
> 
> >                                                               So please
> > also do a change in tools/memory-model/README "REQUIREMENTS" session
> > when the new version released.
> 
> Puranjay, it would be great if you add some litmus tests which use
> additional atomic primitives under tools/memory-model/litmus-tests/
> as well.

Thank you for checking, Akira!  I need to hold off sending this upstream
until there is a herdtools7 release that supports it.  So not the merge
window that is likely to open this weekend.  ;-)

							Thanx, Paul

>         Thanks, Akira
> 
> > Boqun
> > 
> >>
> >> Signed-off-by: Puranjay Mohan <puranjay@...nel.org>
> >> ---
> >>  tools/memory-model/linux-kernel.def | 21 +++++++++++++++++++++
> >>  1 file changed, 21 insertions(+)
>