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Fri, 24 May 2024 08:37:11 -0700 (PDT) Received: from andrea ([151.76.32.59]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4210897bc02sm23724085e9.22.2024.05.24.08.37.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 May 2024 08:37:10 -0700 (PDT) Date: Fri, 24 May 2024 17:37:06 +0200 From: Andrea Parri To: stern@rowland.harvard.edu, will@kernel.org, peterz@infradead.org, boqun.feng@gmail.com, npiggin@gmail.com, dhowells@redhat.com, j.alglave@ucl.ac.uk, luc.maranget@inria.fr, paulmck@kernel.org, akiyks@gmail.com, dlustig@nvidia.com, joel@joelfernandes.org Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, hernan.poncedeleon@huaweicloud.com, jonas.oberhauser@huaweicloud.com Subject: Re: [PATCH] tools/memory-model: Document herd7 (internal) representation Message-ID: References: <20240524151356.236071-1-parri.andrea@gmail.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240524151356.236071-1-parri.andrea@gmail.com> > - While checking the information below using herd7, I've observed some > "strange" behavior with spin_is_locked() (perhaps, unsurprisingly...); > IAC, that's also excluded from this table/submission. For completeness, the behavior in question: $ cat T.litmus C T {} P0(spinlock_t *x) { int r0; spin_lock(x); spin_unlock(x); r0 = spin_is_locked(x); } $ herd7 -conf linux-kernel.cfg T.litmus Test T Required States 0 Ok Witnesses Positive: 0 Negative: 0 Condition forall (true) Observation T Never 0 0 Time T 0.00 Hash=6fa204e139ddddf2cb6fa963bad117c0 Haven't been using spin_is_locked for a while... perhaps I'm doing something wrong? (IAC, will have a closer look next week...) Andrea