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Use sg_miter iterator instead of sg_virt() and custom code to loop over the scatterlist. The memory iterator will do bounce buffering if the page happens to be located in high memory, which the driver may or may not be using. Suggested-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/linux-mmc/20240122073423.GA25859@lst.de/ Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20240127-mmc-proper-kmap-v2-9-d8e732aa97d1@linaro.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>