flush_dcache_page vs kunmap_local
From: Matthew Wilcox <willy@infradead.org>
Date: 2021-11-04 15:03:39
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In https://lore.kernel.org/lkml/CAHk-=wijdojzo56FzYqE5TOYw2Vws7ik3LEMGj9SPQaJJ+Z73Q@mail.gmail.com/ (local) 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?