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Sat, 29 Apr 2023 05:17:09 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ7dZCdbj2/CUyOAnF1aCo5g7R0qxzOqg5E2KhVoZ5yy4+wF3l/m1Jh9ui9lSjoP1C+0UsUCMA== X-Received: by 2002:a17:906:3a8f:b0:953:37d9:282f with SMTP id y15-20020a1709063a8f00b0095337d9282fmr9582117ejd.38.1682770629189; Sat, 29 Apr 2023 05:17:09 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 17/17] cpus-common: stop using mb_set/mb_read Date: Sat, 29 Apr 2023 14:16:36 +0200 Message-Id: <20230429121636.230934-18-pbonzini@redhat.com> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230429121636.230934-1-pbonzini@redhat.com> References: <20230429121636.230934-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.171, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1682770686007100001 Content-Type: text/plain; charset="utf-8" Use a store-release at the end of the work item, and a load-acquire when waiting for the item to be completed. This is the standard message passing pattern and is both enough and clearer than mb_read/mb_set. Signed-off-by: Paolo Bonzini --- cpus-common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/cpus-common.c b/cpus-common.c index b0047e456f93..a53716deb437 100644 --- a/cpus-common.c +++ b/cpus-common.c @@ -157,7 +157,7 @@ void do_run_on_cpu(CPUState *cpu, run_on_cpu_func func,= run_on_cpu_data data, wi.exclusive =3D false; =20 queue_work_on_cpu(cpu, &wi); - while (!qatomic_mb_read(&wi.done)) { + while (!qatomic_load_acquire(&wi.done)) { CPUState *self_cpu =3D current_cpu; =20 qemu_cond_wait(&qemu_work_cond, mutex); @@ -363,7 +363,7 @@ void process_queued_cpu_work(CPUState *cpu) if (wi->free) { g_free(wi); } else { - qatomic_mb_set(&wi->done, true); + qatomic_store_release(&wi->done, true); } } qemu_mutex_unlock(&cpu->work_mutex); --=20 2.40.0