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22 Aug 2019 00:56:18 -0700 IronPort-SDR: LMuHXB3z06ZWti+mKQI/IsLz8aTtCS18D19F4tFR9Hrk6jSZb6zcimTZHv+wNvksstATECV2qP 73q5WejYVS1IPw7eHpwmJtow4z6SFnGiXATYL9CsI3PWZhNNgQBbi18SRs5cQzOrk9rcStHT1D XizVxDssMCr3aoDxRre3qw11iWCVVz2nQUJ2kTVcvJOGKJkiH99h06ONnxBUaIFUBVmIu+1i1R eGdJNPvoccxtLCS4DMyC2Uh1uWdhlJWF5r1znhYcGTMNtzJv8lxszy3a0XZVCPQS/qt/NvGtsm WSE= WDCIronportException: Internal Received: from jedi-01.sdcorp.global.sandisk.com (HELO jedi-01.int.fusionio.com) ([10.11.143.218]) by uls-op-cesaip02.wdc.com with ESMTP; 22 Aug 2019 00:58:58 -0700 From: Atish Patra To: linux-kernel@vger.kernel.org Subject: [PATCH v4 1/3] RISC-V: Do not invoke SBI call if cpumask is empty Date: Thu, 22 Aug 2019 00:51:49 -0700 Message-Id: <20190822075151.24838-2-atish.patra@wdc.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190822075151.24838-1-atish.patra@wdc.com> References: <20190822075151.24838-1-atish.patra@wdc.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190822_005902_902267_03007172 X-CRM114-Status: UNSURE ( 9.17 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Albert Ou , Palmer Dabbelt , Atish Patra , Anup Patel , Paul Walmsley , linux-riscv@lists.infradead.org, Christoph Hellwig Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org SBI calls are expensive. If cpumask is empty, there is no need to trap via SBI as no remote tlb flushing is required. Signed-off-by: Atish Patra --- arch/riscv/mm/tlbflush.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c index df93b26f1b9d..1293b8017ee0 100644 --- a/arch/riscv/mm/tlbflush.c +++ b/arch/riscv/mm/tlbflush.c @@ -14,6 +14,9 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start, { struct cpumask hmask; + if (cpumask_empty(cmask)) + return; + riscv_cpuid_to_hartid_mask(cmask, &hmask); sbi_remote_sfence_vma(hmask.bits, start, size); } -- 2.21.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv