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Subjectflush_dcache_page vs kunmap_local
In https://lore.kernel.org/lkml/CAHk-=wijdojzo56FzYqE5TOYw2Vws7ik3LEMGj9SPQaJJ+Z73Q@mail.gmail.com/
Linus offers the opinion that kunmap calls should imply a
flush_dcache_page(). Christoph added calls to flush_dcache_page()
in commit 8dad53a11f8d. Was this "voodoo programming", or was there
a real problem being addressed?

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