Ilya Loginov 2d4dc890b5 block: add helpers to run flush_dcache_page() against a bio and a request's pages
Mtdblock driver doesn't call flush_dcache_page for pages in request.  So,
this causes problems on architectures where the icache doesn't fill from
the dcache or with dcache aliases.  The patch fixes this.

The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid
pointless empty cache-thrashing loops on architectures for which
flush_dcache_page() is a no-op.  Every architecture was provided with this
flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is
equal 1 or do nothing otherwise.

See "fix mtd_blkdevs problem with caches on some architectures" discussion
on LKML for more information.

Signed-off-by: Ilya Loginov <isloginov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Peter Horton <phorton@bitbox.co.uk>
Cc: "Ed L. Cashin" <ecashin@coraid.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2009-11-26 09:16:19 +01:00
..
2009-06-23 08:09:54 -05:00
2009-09-08 17:53:04 -07:00
2008-08-18 21:40:03 +02:00
2008-08-04 13:18:17 +10:00
2009-09-11 11:27:57 +10:00
2009-03-24 11:02:59 +02:00
2009-03-24 11:02:58 +02:00
2008-11-19 16:04:58 +11:00
2009-09-21 14:34:11 +02:00
2008-12-21 14:21:14 +11:00
2009-04-07 15:18:58 +10:00
2008-10-15 11:31:54 +11:00
2008-09-06 19:30:15 +01:00
2009-04-01 08:59:16 -07:00
2009-08-28 14:24:10 +10:00
2008-11-19 16:04:55 +11:00
2009-07-10 14:24:05 -07:00