linux-kernel - Re: [PATCH memory-model 1/3] tools/memory-model: Add atomic_and()/or()/xor() and add

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Date: Wed, 5 Jun 2024 09:27:12 +0900
From: Akira Yokosawa <akiyks@...il.com>
To: "Paul E. McKenney" <paulmck@...nel.org>, linux-kernel@...r.kernel.org,
 linux-arch@...r.kernel.org, kernel-team@...a.com, mingo@...nel.org
Cc: stern@...land.harvard.edu, parri.andrea@...il.com, will@...nel.org,
 peterz@...radead.org, boqun.feng@...il.com, npiggin@...il.com,
 dhowells@...hat.com, j.alglave@....ac.uk, luc.maranget@...ia.fr,
 Puranjay Mohan <puranjay@...nel.org>, Daniel Lustig <dlustig@...dia.com>,
 Joel Fernandes <joel@...lfernandes.org>, Akira Yokosawa <akiyks@...il.com>
Subject: Re: [PATCH memory-model 1/3] tools/memory-model: Add
 atomic_and()/or()/xor() and add_negative

Hi,

On Tue,  4 Jun 2024 15:14:17 -0700, Paul E. McKenney wrote:
> From: Puranjay Mohan <puranjay@...nel.org>
> 
> 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
> 
> Signed-off-by: Puranjay Mohan <puranjay@...nel.org>
> Acked-by: Andrea Parri <parri.andrea@...il.com>
> Reviewed-by: Boqun Feng <boqun.feng@...il.com>
> Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Will Deacon <will@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: David Howells <dhowells@...hat.com>
> Cc: Jade Alglave <j.alglave@....ac.uk>
> Cc: Luc Maranget <luc.maranget@...ia.fr>
> Cc: Akira Yokosawa <akiyks@...il.com>

Pull-849 and Pull-855 at herdtools7 happened after the release of 7.57.
So I thought patches 1/3 and 2/3 needed to wait a next release of
herdtools7.

But these changes don't affect existing litmus tests.
So I don't oppose them to be merged into 6.11.

It's up to Paul!

        Thanks, Akira

> Cc: Daniel Lustig <dlustig@...dia.com>
> Cc: Joel Fernandes <joel@...lfernandes.org>
> Cc: <linux-arch@...r.kernel.org>