On Wed, Jul 31, 2013 at 08:35:30AM +0900, Minchan Kim wrote: > > which is a false positive caused by hugetlb pmd sharing code which > > allocates a new pmd from withing mappint->i_mmap_mutex. If this > > allocation causes reclaim then the lockdep detector complains that we > > might self-deadlock. > > > > This is not correct though, because hugetlb pages are not reclaimable so > > their mapping will be never touched from the reclaim path. > > > > The patch tells lockup detector that hugetlb i_mmap_mutex is special > > by assigning it a separate lockdep class so it won't report possible > > deadlocks on unrelated mappings. > > > > [peterz@xxxxxxxxxxxxx: comment for annotation] > > Reported-by: Dave Jones <davej@xxxxxxxxxx> > > Signed-off-by: Michal Hocko <mhocko@xxxxxxx> > Reviewed-by: Minchan Kim <minchan@xxxxxxxxxx> > > Thanks, Michal! > Only remained thing is Dave's testing. I've added it to my builds, all is quiet so far.. Dave -- 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>