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[61.68.186.125]) by smtp.gmail.com with ESMTPSA id 17sm6001953pfv.16.2020.07.02.00.48.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2020 00:49:03 -0700 (PDT) From: Nicholas Piggin Cc: Nicholas Piggin , Will Deacon , Peter Zijlstra , Boqun Feng , Ingo Molnar , Waiman Long , Anton Blanchard , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 2/8] powerpc/pseries: use smp_rmb() in H_CONFER spin yield Date: Thu, 2 Jul 2020 17:48:33 +1000 Message-Id: <20200702074839.1057733-3-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200702074839.1057733-1-npiggin@gmail.com> References: <20200702074839.1057733-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is no need for rmb(), this allows faster lwsync here. Signed-off-by: Nicholas Piggin --- arch/powerpc/lib/locks.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c index 6440d5943c00..47a530de733e 100644 --- a/arch/powerpc/lib/locks.c +++ b/arch/powerpc/lib/locks.c @@ -30,7 +30,7 @@ void splpar_spin_yield(arch_spinlock_t *lock) yield_count = be32_to_cpu(lppaca_of(holder_cpu).yield_count); if ((yield_count & 1) == 0) return; /* virtual cpu is currently running */ - rmb(); + smp_rmb(); if (lock->slock != lock_value) return; /* something has changed */ plpar_hcall_norets(H_CONFER, @@ -56,7 +56,7 @@ void splpar_rw_yield(arch_rwlock_t *rw) yield_count = be32_to_cpu(lppaca_of(holder_cpu).yield_count); if ((yield_count & 1) == 0) return; /* virtual cpu is currently running */ - rmb(); + smp_rmb(); if (rw->lock != lock_value) return; /* something has changed */ plpar_hcall_norets(H_CONFER, -- 2.23.0