Add a WARN_ON to help spot vmalloc weird behaviour. Will revert later.

polesapart · Jun 17, 2020 · fc293cd · fc293cd
1 parent 558c120
commit fc293cd
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
@@ -494,9 +494,10 @@ static struct vmap_area *alloc_vmap_area(unsigned long size,
 	 * Check also calculated address against the vstart,
 	 * because it can be 0 because of big align request.
 	 */
-	if (addr + size > vend || addr < vstart)
+	if (addr + size > vend || addr < vstart) {
+		WARN_ON(addr < vstart);
 		goto overflow;
-
+	}
 	va->va_start = addr;
 	va->va_end = addr + size;
 	va->flags = 0;