Re: [patch] cache flush bug in mm/filemap.c (all kernels >=2.5.30(at least))

[David S. Miller (davem@redhat.com)]

   From: Mika Penttilä <mika.penttila@xxxxxxxxxxx>
   Date: Mon, 26 May 2003 08:36:34 +0300

   ah, ok. so there are cache issues even if if the user pte is not 
   established yet? Then it seems natural to couple flush_dcache_page
   with pte establishing, not at the driver level.

flush_dcache_page() or some architecture level equivalent belongs
whereever the kernel uses CPU store instructions to modify a page's
contents.

When IDE uses PIO to do a data transfer, the flush belongs there.
Right now this is occuring in the architecture defined IDE insw/outsw
macros.  It very well might be more efficient to do this at a higher
level where the total extent of the I/O is known.
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