Hi Aneesh, On Mon, May 13, 2013 at 08:36:38PM +0530, Aneesh Kumar K.V wrote: > https://lists.ozlabs.org/pipermail/linuxppc-dev/2013-May/106406.html You need ACCESS_ONCE() in all "pgd = ACCESS_ONCE(*pgdp)", "pud = ACCESS_ONCE(*pudp)" otherwise the compiler could decide your change is a noop. I think you could remove the #ifdef CONFIG_TRANSPARENT_HUGEPAGE too. Thanks, Andrea -- 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>