Have hugetlb_fault() call unlock_page(page) only if it had previously called
lock_page(page).
Signed-off-by: Dean Nelson <[email protected]>
CC: [email protected]
---
Setting CONFIG_DEBUG_VM=y and then running the libhugetlbfs test suite,
resulted in the tripping of VM_BUG_ON(!PageLocked(page)) in unlock_page()
having been called by hugetlb_fault() when page == pagecache_page.
This patch remedied the problem.
mm/hugetlb.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c4a3558..8585524 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2738,7 +2738,8 @@ out_page_table_lock:
unlock_page(pagecache_page);
put_page(pagecache_page);
}
- unlock_page(page);
+ if (page != pagecache_page)
+ unlock_page(page);
out_mutex:
mutex_unlock(&hugetlb_instantiation_mutex);