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only available with !CONFIG_HIGHMEM because the intent is to >> use architecture support to clear contiguous extents in a single >> operation (ex. via FEAT_MOPS on arm64, string instructions on x86) >> which excludes any possibility of interspersing kmap()/kunmap(). >> Signed-off-by: Ankur Arora >> --- > > Staring at the next patch, I think this can easily be squashed into the next > patch where you add actual MM core support. I wanted to do this in a separate patch to explicitly document what the responsibility of the interface provided by the architecture is. That said, the commit message didn't actually do a good job of doing that :D. Copying the more detailed commit message from my reply to Andrew, one important part of the clear_pages() is that it be interruptible because clear_pages_resched() implicitly depends on it. > This is only enabled with !CONFIG_HIGHMEM because the intent is > to use architecture support to clear contiguous extents in a > single interruptible operation (ex. via FEAT_MOPS on arm64, > string instructions on x86). > Given that we might be zeroing the whole extent with a single > instruction, this excludes any possibility of constructing > intermediate HIGHMEM maps. Do you think it is best documented in the next patch in a comment instead? -- ankur