linux-kernel - Re: [RFC][PATCH 4/4] tools/memory-model: Distinguish between syntactic and semantic tags

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Date: Tue, 28 May 2024 14:49:38 +0200
From: Jonas Oberhauser <jonas.oberhauser@...weicloud.com>
To: Alan Stern <stern@...land.harvard.edu>
Cc: paulmck@...nel.org, 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,
 akiyks@...il.com, dlustig@...dia.com, joel@...lfernandes.org,
 urezki@...il.com, quic_neeraju@...cinc.com, frederic@...nel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 4/4] tools/memory-model: Distinguish between
 syntactic and semantic tags

>> +let Mb = MB \ FailedRMW
>> >>   (* Compute marked and plain memory accesses *)
>> -let Marked = (~M) | IW | Once | Release | Acquire | domain(rmw) | range(rmw) |
>> +let Marked = (~M) | IW | ONCE | RELEASE | ACQUIRE | MB | domain(rmw) | range(rmw) |
> 
> The new MB term isn't needed, because MB tags on memory accesses are
> filtered out unless the access also belongs to domain(rmw) | range(rmw).
> 
> Alan


Thanks for all the notes.
I think on this one is needed though under the assumption that herd7 
would no longer know internally to replace the MB with ONCE in case
of failure.


best wishes,

   jonas