still nfs problems [Was: Linux 2.6.37-rc8]
Russell King - ARM Linux
linux at arm.linux.org.uk
Wed Jan 5 18:59:22 EST 2011
On Wed, Jan 05, 2011 at 03:28:53PM -0800, Linus Torvalds wrote:
> On Wed, Jan 5, 2011 at 3:06 PM, Trond Myklebust
> <Trond.Myklebust at netapp.com> wrote:
> > Yes. The fix I sent out was a call to invalidate_kernel_vmap_range(),
> > which takes care of invalidating the cache prior to a virtual address
> > read.
> > My question was specifically about the write through the regular kernel
> > mapping: according to Russell and my reading of the cachetlb.txt
> > documentation, flush_dcache_page() is only guaranteed to have an effect
> > on page cache pages.
> I don't think that should ever matter. It's not like the hardware can
> know whether it's a dcache page or not.
> And if the sw implementation cares, it's doing something really odd.
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