On Wed, 2007-07-25 at 18:30 -0500, Dave McCracken wrote:

On Wednesday 25 July 2007, Benjamin Herrenschmidt wrote:

quoted

Depends... if you have CONFIG_HIGHMEM and not CONFIG_HIGHPTE, you are
wasting time going through kmap_atomic unnecessarily no ? it will probably
not do anything because the PTE page is in lowmem but still...

Probably not much time.  You still need to do the page to virtual translation, 
which kmap_atomic does for you.

Fair enough.

Ben.