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Mon, 28 Nov 2022 04:07:20 +0000 Received: from localhost.localdomain (ip72-199-50-187.sd.sd.cox.net [72.199.50.187]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dave@stgolabs.net) by pdx1-sub0-mail-a283.dreamhost.com (Postfix) with ESMTPSA id 4NLBkc1Rw9zCV; Sun, 27 Nov 2022 20:07:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=stgolabs.net; s=dreamhost; t=1669608440; bh=cNHJgNohZbk1ATNrC2SM8HmkbxHfzP5Rb8J4WNikoEY=; h=From:To:Cc:Subject:Date:Content-Transfer-Encoding; b=Elhx8hzils/2f+pIyPwtdDOoHpK3lVoa3HliCMM/wiFtVkuE0FsyXTxN5b/7thvtY Acb8uHx2IOaVRqVPk2Ko6eDpCgQcTFscXpCA4bYINGTpEEffpTD0w+LFLcKRwmTlOV djL4MYx1A60qKiJYU7Y+O/LmlXhaKYuaxzTR1w+NGOUqTl6CVkaPpJ2t2T4VQnFb5E LE1gCwOHIM6Z2TJg87zvU5gcoItA+3gpFR/MptVKjfhW8TXGYSMP9cT/gxGcNBgHU5 6V/ENYyfnI+g205auuWmnl5p91D0rEZ1FqfUahqdaxPbjsmjnRNKujZApgo0mjzhzL FnnJ3zNKG8VEg== From: Davidlohr Bueso To: mst@redhat.com Cc: virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, dave@stgolabs.net Subject: [PATCH 2/2] tools/virtio: remove smp_read_barrier_depends() Date: Sun, 27 Nov 2022 19:43:47 -0800 Message-Id: <20221128034347.990-3-dave@stgolabs.net> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221128034347.990-1-dave@stgolabs.net> References: <20221128034347.990-1-dave@stgolabs.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This gets rid of the last references to smp_read_barrier_depends() which for the kernel side was removed in v5.9. The serialization required for Alpha is done inside READ_ONCE() instead of having users deal with it. Simply use a full barrier, the architecture does not have rmb in the first place. Signed-off-by: Davidlohr Bueso --- tools/virtio/ringtest/main.h | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/tools/virtio/ringtest/main.h b/tools/virtio/ringtest/main.h index 9ed09caa659e..b68920d52750 100644 --- a/tools/virtio/ringtest/main.h +++ b/tools/virtio/ringtest/main.h @@ -140,12 +140,6 @@ static inline void busy_wait(void) #define smp_wmb() smp_release() #endif -#ifdef __alpha__ -#define smp_read_barrier_depends() smp_acquire() -#else -#define smp_read_barrier_depends() do {} while(0) -#endif - static __always_inline void __read_once_size(const volatile void *p, void *res, int size) { @@ -175,13 +169,22 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s } } +#ifdef __alpha__ #define READ_ONCE(x) \ ({ \ union { typeof(x) __val; char __c[1]; } __u; \ __read_once_size(&(x), __u.__c, sizeof(x)); \ - smp_read_barrier_depends(); /* Enforce dependency ordering from x */ \ + smp_mb(); /* Enforce dependency ordering from x */ \ __u.__val; \ }) +#else +#define READ_ONCE(x) \ +({ \ + union { typeof(x) __val; char __c[1]; } __u; \ + __read_once_size(&(x), __u.__c, sizeof(x)); \ + __u.__val; \ +}) +#endif #define WRITE_ONCE(x, val) \ ({ \ -- 2.38.1