Highmem issues with MMC filesystem

[Russell King - ARM Linux]

On Fri, Mar 19, 2010 at 02:27:24PM -0400, Nicolas Pitre wrote:
> But on ARMv6 this is different.  The L1 cache is VIPT and it therefore 
> doesn't have to be flushed as often as a VIVT cache.  Still, as far as I 
> know, the highmem code currently always flush any page to be unmapped.  
> But somewhere somehow an unmapped highmem page becomes subject to DMA 
> and apparently can still be L1 cached.

This does not explain the corrupted ext2 metadata, which is in lowmem
pages.

Let's get a fresh set of clear bug reports giving all relevant information.
Let's not continue to scatter small little bits of information in multiple
emails.