linux-kernel - flush_dcache_page vs kunmap

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Message-ID: <YYP1lAq46NWzhOf0@casper.infradead.org>
Date:   Thu, 4 Nov 2021 15:00:36 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>
Cc:     linux-arch@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: flush_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?