[PATH V2 5/6] arm64: mm: Enable HAVE_RCU_TABLE_FREE logic

Steve Capper steve.capper at linaro.org
Wed Aug 27 06:08:25 PDT 2014

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:
> > 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 <steve.capper at linaro.org>
> 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 at arm.com>

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

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