On Tue, 4 Nov 2014, Davidlohr Bueso wrote: > 8<------------------------------------------------ > From: Davidlohr Bueso <dave@xxxxxxxxxxxx> > Subject: [PATCH 11/10] mm/memory.c: share the i_mmap_rwsem > > The unmap_mapping_range family of functions do the unmapping > of user pages (ultimately via zap_page_range_single) without > touching the actual interval tree, thus share the lock. > > Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx> Acked-by: Hugh Dickins <hughd@xxxxxxxxxx> Yes, thanks, let's get this 11/10 into mmotm along with the rest, but put the hugetlb 10/10 on the shelf for now, until we've had time to contemplate it more deeply. > --- > mm/memory.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/mm/memory.c b/mm/memory.c > index 2ca3105..06f2458 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -2396,12 +2396,12 @@ void unmap_mapping_range(struct address_space *mapping, > details.last_index = ULONG_MAX; > > > - i_mmap_lock_write(mapping); > + i_mmap_lock_read(mapping); > if (unlikely(!RB_EMPTY_ROOT(&mapping->i_mmap))) > unmap_mapping_range_tree(&mapping->i_mmap, &details); > if (unlikely(!list_empty(&mapping->i_mmap_nonlinear))) > unmap_mapping_range_list(&mapping->i_mmap_nonlinear, &details); > - i_mmap_unlock_write(mapping); > + i_mmap_unlock_read(mapping); > } > EXPORT_SYMBOL(unmap_mapping_range); > > -- > 1.8.4.5 -- 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>