From: Davidlohr Bueso <dave@xxxxxxxxxxxx>
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.
It is currently unused, but will be in the next patches.
Signed-off-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
include/linux/mm.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 9d2ed23aa894..bcf2509d448d 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -361,6 +361,10 @@ struct vm_fault {
* page table to avoid allocation from
* atomic context.
*/
+ struct range_lock *lockrange; /* Range lock interval in use for when
+ * the mm lock is manipulated throughout
+ * its lifespan.
+ */
};
/* page entry size for vm->huge_fault() */
--
2.13.6
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