[PATCH] kasan, mm: fix build issue with asmlinkage

[Valdis Klētnieks]

commit 2df573d2ca4c1ce6ea33cb7849222f771e759211
Author: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Date:   Tue Nov 24 16:45:08 2020 +1100

    kasan: shadow declarations only for software modes

introduces a build failure when it removed an include for linux/pgtable.h
It actually only needs linux/linkage.h

Test builds on both x86_64 and arm build cleanly

Fixes:   2df573d2ca4c ("kasan: shadow declarations only for software modes")
Signed-off-by: Valdis Kletnieks <valdis.kletnieks@xxxxxx>

---
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 83860aa4e89c..5e0655fb2a6f 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -12,6 +12,7 @@ struct task_struct;
 
 #ifdef CONFIG_KASAN
 
+#include <linux/linkage.h>
 #include <asm/kasan.h>
 
 /* kasan_data struct is used in KUnit tests for KASAN expected failures */