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[110.174.173.27]) by smtp.gmail.com with ESMTPSA id az16sm5871998pjb.7.2020.07.24.06.15.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jul 2020 06:15:12 -0700 (PDT) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Cc: Nicholas Piggin , Will Deacon , Peter Zijlstra , Boqun Feng , Ingo Molnar , Waiman Long , Anton Blanchard , =?UTF-8?q?Michal=20Such=C3=A1nek?= , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH v4 6/6] powerpc: implement smp_cond_load_relaxed Date: Fri, 24 Jul 2020 23:14:23 +1000 Message-Id: <20200724131423.1362108-7-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200724131423.1362108-1-npiggin@gmail.com> References: <20200724131423.1362108-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This implements smp_cond_load_relaed with the slowpath busy loop using the preferred SMT priority pattern. Signed-off-by: Nicholas Piggin --- arch/powerpc/include/asm/barrier.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h index 123adcefd40f..9b4671d38674 100644 --- a/arch/powerpc/include/asm/barrier.h +++ b/arch/powerpc/include/asm/barrier.h @@ -76,6 +76,20 @@ do { \ ___p1; \ }) +#define smp_cond_load_relaxed(ptr, cond_expr) ({ \ + typeof(ptr) __PTR = (ptr); \ + __unqual_scalar_typeof(*ptr) VAL; \ + VAL = READ_ONCE(*__PTR); \ + if (unlikely(!(cond_expr))) { \ + spin_begin(); \ + do { \ + VAL = READ_ONCE(*__PTR); \ + } while (!(cond_expr)); \ + spin_end(); \ + } \ + (typeof(*ptr))VAL; \ +}) + #ifdef CONFIG_PPC_BOOK3S_64 #define NOSPEC_BARRIER_SLOT nop #elif defined(CONFIG_PPC_FSL_BOOK3E) -- 2.23.0