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Mon, 28 Jun 2021 05:34:15 -0700 (PDT) From: Neil Armstrong To: jgg@ziepe.ca, leon@kernel.org, m.szyprowski@samsung.com, robin.murphy@arm.com, ulf.hansson@linaro.org Cc: torvalds@linux-foundation.org, khilman@baylibre.com, jbrunet@baylibre.com, linux-mmc@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Neil Armstrong Subject: [PATCH RFC 0/2] scatterlist: add I/O variant of sg_pcopy & sg_copy and use them Date: Mon, 28 Jun 2021 14:34:09 +0200 Message-Id: <20210628123411.119778-1-narmstrong@baylibre.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=976; h=from:subject; bh=iVEMvBLaRZgih5yGs1nmMY9KLw8WXAeUJcp1bYFUiBY=; b=owEBbQKS/ZANAwAKAXfc29rIyEnRAcsmYgBg2cGWtsGJ0XA8KWFoXtdBdbBZY/Eo9DjS/KkXuTzv 5/+iniKJAjMEAAEKAB0WIQQ9U8YmyFYF/h30LIt33NvayMhJ0QUCYNnBlgAKCRB33NvayMhJ0XPhEA CcU6sOzBX3jxArz37tuZhTke4Yg6dNMPnsx19qObWnWEpWCFEdEzrPxjZH8d2shIfumiocFQt1tlQf NrsBokdpyV2jvNOgHBTsDGYfqBlxKE4tMytf5ooHTErzX9XraDT1cXZKBKAEcYiti/49Hgsd7NQQ3N NGEY0fI8LIpEFotO67MZ7zO9zjqqDnBqQYBpmCAW207JExawMCmAeWUfuV7lJhXqut5nX57hV3Ia6i IKu0l5t319rVU+tLJI7zcVEAZDP63rBK/GCAy4AdY/a2KzZHvjKYFh2MXwoFIx74Xdgzn+mp+pZHQ5 Gy1CZOHdaA7Nd9apmUfVxGq49AkH4GglixwfZC/U1n59sOfZvt3SvEi7LYBDDiORE9+mHr8Eo0DiW4 pGSEU7giItN3JyECFLqjnJt+wQJXZlQYn+nvJtaWz+O00wIA7vKQPl8PbNZGvQEIDdwJyRUdqXjvca +SHOa5/6FnOYt74n+VwOeiXbMXnFCW3mpbR8jdOyRd+oz+VQIE3J82S296md6xTQEe0oQ98nnQ2PUC SsxUoFHiBZyHwoAVVdgtAe+KtcJLSgvOkGmfK4ylJpCH6wxWeZmuecrNTghwCp8Q/x3fZ2Wyf8ogMG IM9QL/KQH/1DL1WHS0A8gqMFvLbjg1m3Xj1DnhnkZvfDbY4d8/Pn5cLa7LpQ== X-Developer-Key: i=narmstrong@baylibre.com; a=openpgp; fpr=89EC3D058446217450F22848169AB7B1A4CFF8AE Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org A local variant of sg_copy_buffer has been introduced in the meson-gx mmc driver [1] after a mempcy optimization, fixing the iomem buffer manipulation and the reported system crash [2]. But, the fix is suboptimal in terms of performace/ugliness [3] and a proper I/O variant of sg_copy_buffer should be added and used instead. [1] https://lore.kernel.org/r/20210609150230.9291-1-narmstrong@baylibre.com [2] https://lore.kernel.org/r/acb244ad-0759-5a96-c659-5c23003d3dcd@samsung.com [3] https://lore.kernel.org/r/CAPDyKFrLSMpPJOgd5e4B1x3Vwfg4q23zgy4ESc8EmFL2MnyK7g@mail.gmail.com Neil Armstrong (2): scatterlist: add I/O variant of sg_pcopy & sg_copy mmc: meson-gx: use sg_copy_to/from_io instead of local version drivers/mmc/host/meson-gx-mmc.c | 53 +++----------- include/linux/scatterlist.h | 14 ++++ lib/scatterlist.c | 119 ++++++++++++++++++++++++++++++++ 3 files changed, 143 insertions(+), 43 deletions(-)