On Mon, Jan 13, 2014 at 02:17:48PM -0800, Andrew Morton wrote: > On Thu, 2 Jan 2014 04:19:51 +0200 "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx> wrote: > > > On Wed, Jan 01, 2014 at 09:29:05PM +1100, Benjamin Herrenschmidt wrote: > > > On Wed, 2014-01-01 at 15:23 +0530, Aneesh Kumar K.V wrote: > > > > From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > > > > > > > > This patch fix the below crash > > > > > > > > NIP [c00000000004cee4] .__hash_page_thp+0x2a4/0x440 > > > > LR [c0000000000439ac] .hash_page+0x18c/0x5e0 > > > > ... > > > > Call Trace: > > > > [c000000736103c40] [00001ffffb000000] 0x1ffffb000000(unreliable) > > > > [437908.479693] [c000000736103d50] [c0000000000439ac] .hash_page+0x18c/0x5e0 > > > > [437908.479699] [c000000736103e30] [c00000000000924c] .do_hash_page+0x4c/0x58 > > > > > > > > On ppc64 we use the pgtable for storing the hpte slot information and > > > > store address to the pgtable at a constant offset (PTRS_PER_PMD) from > > > > pmd. On mremap, when we switch the pmd, we need to withdraw and deposit > > > > the pgtable again, so that we find the pgtable at PTRS_PER_PMD offset > > > > from new pmd. > > > > > > > > We also want to move the withdraw and deposit before the set_pmd so > > > > that, when page fault find the pmd as trans huge we can be sure that > > > > pgtable can be located at the offset. > > > > > > Did this get fixed? New version: http://thread.gmane.org/gmane.linux.kernel.mm/111809 -- Kirill A. Shutemov -- 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>