From: Mark Lord <liml@rtr.ca>
To: Bahadir Balban <bahadir.lists@googlemail.com>,
Russell King <rmk@arm.linux.org.uk>
Cc: linux-ide@vger.kernel.org
Subject: Re: flushing cache after block io
Date: Tue, 01 May 2007 13:46:56 -0400 [thread overview]
Message-ID: <46377D10.9090605@rtr.ca> (raw)
In-Reply-To: <97bec2470705010658s48c70ba2pc5310efa533a96ea@mail.gmail.com>
Bahadir Balban wrote:
> On an ARM core with write-allocate writeback cache, there can be cache
> inconsistencies when an executable file is read from a block device
> into memory.
>
> On a compact flash block device driver, I got around this problem by
> flushing the caches for the pages that bio buffers use on every bio
> read. E.g.
>
> cflash_read_sectors(dev, sect_begin, nsect, buf);
> flush_icache_range(buf, buf + nsect*512);
>
> Now I have the same problem with a ATA harddisk connected with a
> PDC20269 controller. The question is where would be the best
> high-level place to put these flushes so that it works regardless of
> what block IO driver is used?
Russell, didn't you go through all of this pain and fix it
a year or two ago?
Bahadir, exactly what kernel/version is this with?
next prev parent reply other threads:[~2007-05-01 17:46 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-01 13:58 flushing cache after block io Bahadir Balban
2007-05-01 17:46 ` Mark Lord [this message]
2007-05-03 13:23 ` Russell King
2007-05-03 13:25 ` Bahadir Balban
2007-05-03 13:30 ` Russell King
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