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Tue, 02 Jan 2024 14:01:41 -0800 (PST) Received: from sw06.internal.sifive.com ([4.53.31.132]) by smtp.gmail.com with ESMTPSA id r59-20020a17090a43c100b0028ce507cd7dsm101724pjg.55.2024.01.02.14.01.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jan 2024 14:01:41 -0800 (PST) From: Samuel Holland To: Palmer Dabbelt , linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Alexandre Ghiti , Samuel Holland Subject: [PATCH v4 04/12] riscv: Only send remote fences when some other CPU is online Date: Tue, 2 Jan 2024 14:00:41 -0800 Message-ID: <20240102220134.3229156-5-samuel.holland@sifive.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240102220134.3229156-1-samuel.holland@sifive.com> References: <20240102220134.3229156-1-samuel.holland@sifive.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 6800F140005 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 9rpoih7q3potm4ugzi1y64ya4zgd5ciz X-HE-Tag: 1704232902-716529 X-HE-Meta: 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 AyrW4hy6 NgzP64KdYUQLIkzgQcPS0wkXI5RilEe+dQervQGzK8V1UuFsgfjmAOlO5sAm0UsJqpd9zZwQEM6sShUdFbl7KvGP4OwskBv3r49e9/dEhOc0kknk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.185171, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: If no other CPU is online, a local cache or TLB flush is sufficient. These checks can be constant-folded when SMP is disabled. Signed-off-by: Samuel Holland --- Changes in v4: - New patch for v4 arch/riscv/mm/cacheflush.c | 4 +++- arch/riscv/mm/tlbflush.c | 4 +++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c index 47c485bc7df0..f7933ae88a55 100644 --- a/arch/riscv/mm/cacheflush.c +++ b/arch/riscv/mm/cacheflush.c @@ -21,7 +21,9 @@ void flush_icache_all(void) { local_flush_icache_all(); - if (riscv_use_sbi_for_rfence()) + if (num_online_cpus() < 2) + return; + else if (riscv_use_sbi_for_rfence()) sbi_remote_fence_i(NULL); else on_each_cpu(ipi_remote_fence_i, NULL, 1); diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index 2f18fe6fc4f3..37b3c93e3c30 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -73,7 +73,9 @@ static void __ipi_flush_tlb_all(void *info) void flush_tlb_all(void) { - if (riscv_use_sbi_for_rfence()) + if (num_online_cpus() < 2) + local_flush_tlb_all(); + else if (riscv_use_sbi_for_rfence()) sbi_remote_sfence_vma_asid(NULL, 0, FLUSH_TLB_MAX_SIZE, FLUSH_TLB_NO_ASID); else on_each_cpu(__ipi_flush_tlb_all, NULL, 1);