linux-kernel - Re: [PATCH] tools/memory-model: Add atomic

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Date: Tue, 14 May 2024 13:11:22 +0200
From: Andrea Parri <parri.andrea@...il.com>
To: Puranjay Mohan <puranjay@...nel.org>
Cc: Alan Stern <stern@...land.harvard.edu>, Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Nicholas Piggin <npiggin@...il.com>,
	David Howells <dhowells@...hat.com>,
	Jade Alglave <j.alglave@....ac.uk>,
	Luc Maranget <luc.maranget@...ia.fr>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Akira Yokosawa <akiyks@...il.com>,
	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_andnot() with its variants

> C andnot
> 
> {
> atomic_t u = ATOMIC_INIT(7);
> }
> 
> P0(atomic_t *u)
> {
> 
>         r0 = atomic_fetch_andnot(3, u);
>         r1 = READ_ONCE(*u);
> }
> 
> exists (0:r0=7 /\ 0:r1=4)

Fair enough for the changelog.  If/when submitting proper tests, please
check their format using klitmus7 (besides herd7); say,

  $ mkdir mymodule
  $ klitmus7 -o mymodule <.litmus file>
  $ cd mymodule ; make
  $ sudo sh run.sh

Documentation/litmus-tests/ provides some examples litmus tests.


> Signed-off-by: Puranjay Mohan <puranjay@...nel.org>

Acked-by: Andrea Parri <parri.andrea@...il.com>

  Andrea