tree 6c12d3c738c3118ccab724b5b984fc07c7e58082
parent 1bfe5febe34d2be2120803c10720e179186357c9
author Andi Kleen <andi@firstfloor.org> 1260962400 +0100
committer Andi Kleen <ak@linux.intel.com> 1260962400 +0100

HWPOISON: Use get_user_page_fast in hwpoison madvise

The previous version didn't take the mmap_sem before calling gup(),
which is racy.

Use get_user_pages_fast() instead which doesn't need any locks.
This is also faster of course, but then it doesn't really matter
because this is just a testing path.

Based on report from Nick Piggin.
Cc: npiggin@suse.de

Signed-off-by: Andi Kleen <ak@linux.intel.com>