[RFC v2 03/10] mm: Add a range parameter to the vm_fault structure

Laurent Dufour
2017-05-24T11:20:57Z

When handling a page fault, it happens that the mmap_sem is released
during the processing. As moving to range lock requires to pass the
range parameter to the lock/unlock operation, this patch add a pointer
to the range structure used when locking the mmap_sem to vm_fault
structure.

Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
---
include/linux/mm.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7cb17c6b97de..4ad96294c180 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -344,6 +344,9 @@ struct vm_fault {
* page table to avoid allocation from
* atomic context.
*/
+#ifdef CONFIG_MEM_RANGE_LOCK
+ struct range_lock *lockrange; /* Range lock interval */
+#endif
};

/* page entry size for vm->huge_fault() */
--
2.7.4