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b=Dpeimn7TXOjjg21KX/KAwJlUBXDTGEniy3g+08+81ZqpjE8m2sHZC8s4PiO3D72YP nbAxFXOyK+IX62GQoJj1a6ApROF5XxeXnbECiyALkPL1YtOkpj3XJAFU4Y0eJjuEi4 KPMLid/+OzbhmOvXaGYbG+f2bkrFov8b3gKuDV3rUV1lxG4Ur1zKe2Ntc6wr++eqQF zqx/E84Q3BQT+fQDezoYdwf56UJpdtDZu9c12shZe58/CP5tgQtZ/p+UXAB6RJgbUm c9NZsEynaoOHY7RPUj7fEYRPAbGXnn9iG5owd47wkPIqjqqIBqqCg6EVmDahrNh5MT NEmz38AK1GmwA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200917_073236_285811_6D1DCCB0 X-CRM114-Status: GOOD ( 10.71 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: catalin.marinas@arm.com, Leon Romanovsky , Benjamin Herrenschmidt , Bjorn Helgaas , linux-pci@vger.kernel.org, will@kernel.org, linux-arm-kernel@lists.infradead.org, Clint Sbisa Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Sep 17, 2020 at 11:28:19AM +0100, Lorenzo Pieralisi wrote: > Unfortunately if we merge this patch we _do_ know from this thread > that userspace will suffer from a perf regression on TX2. > > Either we ignore it or we write some code to prevent it > (ie first step make arch_can_pci_mmap_wc() return 0 on TX2 - > possibly using the arm64 errata detection mechanism). If anyone complains they can send the change to arch_can_pci_mmap_wc() - I'm pretty sure nobody will complain due to mlx5 Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel