On Wednesday 25 July 2007, Benjamin Herrenschmidt wrote:

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.

Dave McCracken

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