Re: [patch] cache flush bug in mm/filemap.c (all kernels >=2.5.30(at least))
From: David S. Miller (firstname.lastname@example.org)
Date: Mon May 26 2003 - 00:41:20 EST
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
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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