On Wed, Aug 27, 2014 at 11:48:41AM +0100, Catalin Marinas wrote:

On Thu, Aug 21, 2014 at 04:43:31PM +0100, Steve Capper wrote:

quoted

In order to implement fast_get_user_pages we need to ensure that the
page table walker is protected from page table pages being freed from
under it.

This patch enables HAVE_RCU_TABLE_FREE, any page table pages belonging
to address spaces with multiple users will be call_rcu_sched freed.
Meaning that disabling interrupts will block the free and protect the
fast gup page walker.

Signed-off-by: Steve Capper <redacted>

I'm happy to take this patch independently of this series. But if the
whole series goes in via some other tree (mm):

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

Thanks. If patch #1 looks okay to the mm folks, I'm hoping this patch
can be merged via the same tree.