Hi Steve, On 05/06/2014 11:30 AM, Steve Capper wrote: > 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. > diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c > index 3387e60..91a2b59 100644 > --- a/arch/arm/mm/flush.c > +++ b/arch/arm/mm/flush.c > @@ -377,3 +377,22 @@ void __flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned l > */ > __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE); > } > + > +#ifdef CONFIG_TRANSPARENT_HUGEPAGE > +#ifdef CONFIG_HAVE_RCU_TABLE_FREE This is trivia, but I for one find the form #if defined(a) && defined(b) easier to read. (Applies to the A64 version as well). Christopher -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by the Linux Foundation. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>