Re: flushing cache after block io

[Mark Lord <liml@rtr.ca>]

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?