On Wed, Aug 27, 2014 at 12:51:37PM +0100, Catalin Marinas wrote:

On Thu, Aug 21, 2014 at 04:43:30PM +0100, Steve Capper wrote:

quoted

Activate the RCU fast_gup for ARM. We also need to force THP splits to
broadcast an IPI s.t. we block in the fast_gup page walker. As THP
splits are comparatively rare, this should not lead to a noticeable
performance degradation.

Some pre-requisite functions pud_write and pud_page are also added.

Signed-off-by: Steve Capper <redacted>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

Thanks.