Re: [PATCHSET] block: fix PIO cache coherency bug

From: James Bottomley
Date: Mon Mar 20 2006 - 11:31:21 EST

On Tue, 2006-03-21 at 01:26 +0900, Tejun Heo wrote:
> Okay by me, although I think we also need to fix flush_dcache_page()
> such that it doesn't abruptly enable irq after itself. That's just
> broken. I'll make some kmap wrappers such that callers don't have to try
> too hard to get synchronization correct.

That would involve fixing all of the flush_dcache_mmap_lock/unlock()
wrappers to take an extra flags variable (which would be unused on null
implementations) ... it can be done, but it's a lot of work; I think,
since all the current users aren't in atomic context, that we shouldn't
bother unless anyone can see a real need to call it from atomic context.


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