vfree: add debug might_sleep()

Add might_sleep() call to vfree() to catch potential sleep-in-atomic bugs
earlier.

[[email protected]: drop might_sleep_if() from kvfree()]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Andrey Ryabinin <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: aryabinin

mm/vmalloc.c

@@ -1587,6 +1587,8 @@ void vfree(const void *addr)
 
 	kmemleak_free(addr);
 
+	might_sleep_if(!in_interrupt());
+
 	if (!addr)
 		return;
 	if (unlikely(in_interrupt()))