On Sun, 8 Jan 2017, Aneesh Kumar K.V wrote: > Hugh Dickins <hughd@xxxxxxxxxx> writes: > > > And fix a separate pagetable leak, or crash, introduced by the same > > change, that could only show up on some ppc64: why does do_set_pmd()'s > > failure case attempt to withdraw a pagetable when it never deposited > > one, at the same time overwriting (so leaking) the vmf->prealloc_pte? > > Residue of an earlier implementation, perhaps? Delete it. > > That change is part of -mm tree. > > https://lkml.kernel.org/r/20161212163428.6780-1-aneesh.kumar@xxxxxxxxxxxxxxxxxx Ah, so it is, I hadn't looked there. That's reassuring, I'm glad to know you reached the same conclusion on that piece of code. It still worried me that the fix is languishing in mmotm, but it looks not lost: akpm would have sent it in a couple of days anyway, and only affected ppc64 (like the related khugepaged patch you have queued there). > > > > > Fixes: 953c66c2b22a ("mm: THP page cache support for ppc64") > > Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx> > > > Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx> Thanks, and to Linus, who already has this in for -rc3: so akpm can drop mm-thp-pagecache-only-withdraw-page-table-after-a-successful-deposit.patch and then later send in your mm-thp-pagecache-collapse-free-the-pte-page-table-on-collapse-for-thp-page-cache.patch Hugh -- 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>