Always include vmalloc.h on all architectures

Commit 5d29490 ("Only include vmalloc.h on x86") limited the inclusion
of <linux/vmalloc.h> to x86 architectures under the assumption that
only x86 required it explicitly.

However, <linux/vmalloc.h> is not architecture-specific, and other
architectures may currently include it indirectly. To ensure
consistency and future compatibility, include <linux/vmalloc.h>
unconditionally to prevent build failures if indirect includes
change in future kernel versions.

Co-authored-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Co-authored-by: Chisheng Chen <johnny1001s000602@gmail.com>

Author: 3 people

main.c

@@ -8,10 +8,8 @@
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/version.h>
-#include <linux/workqueue.h>
-#if defined(CONFIG_X86)
 #include <linux/vmalloc.h>
-#endif
+#include <linux/workqueue.h>
 
 #include "game.h"
 #include "mcts.h"