[PATCH] kasan: fix build by including kernel.h

[Marco Elver]

The <linux/kasan.h> header relies on _RET_IP_ being defined, and had
been receiving that definition via inclusion of bug.h which includes
kernel.h. However, since f39650de687e that is no longer the case and get
the following build error when building CONFIG_KASAN_HW_TAGS on arm64:

  In file included from arch/arm64/mm/kasan_init.c:10:
  ./include/linux/kasan.h: In function 'kasan_slab_free':
  ./include/linux/kasan.h:230:39: error: '_RET_IP_' undeclared (first use in this function)
    230 |   return __kasan_slab_free(s, object, _RET_IP_, init);

Fix it by including kernel.h from kasan.h.

Fixes: f39650de687e ("kernel.h: split out panic and oops helpers")
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
---
 include/linux/kasan.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 5310e217bd74..dd874a1ee862 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -3,6 +3,7 @@
 #define _LINUX_KASAN_H
 
 #include <linux/bug.h>
+#include <linux/kernel.h>
 #include <linux/static_key.h>
 #include <linux/types.h>
 
-- 
2.32.0.93.g670b81a890-goog