Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/security/apparmor/include/task.h b/security/apparmor/include/task.h
index 55edaa1..f13d123 100644
--- a/security/apparmor/include/task.h
+++ b/security/apparmor/include/task.h
@@ -1,20 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * AppArmor security module
  *
  * This file contains AppArmor task related definitions and mediation
  *
  * Copyright 2017 Canonical Ltd.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation, version 2 of the
- * License.
  */
 
 #ifndef __AA_TASK_H
 #define __AA_TASK_H
 
-#define task_ctx(X) ((X)->security)
+static inline struct aa_task_ctx *task_ctx(struct task_struct *task)
+{
+	return task->security + apparmor_blob_sizes.lbs_task;
+}
 
 /*
  * struct aa_task_ctx - information for current task label change
@@ -37,17 +36,6 @@
 struct aa_label *aa_get_task_label(struct task_struct *task);
 
 /**
- * aa_alloc_task_ctx - allocate a new task_ctx
- * @flags: gfp flags for allocation
- *
- * Returns: allocated buffer or NULL on failure
- */
-static inline struct aa_task_ctx *aa_alloc_task_ctx(gfp_t flags)
-{
-	return kzalloc(sizeof(struct aa_task_ctx), flags);
-}
-
-/**
  * aa_free_task_ctx - free a task_ctx
  * @ctx: task_ctx to free (MAYBE NULL)
  */
@@ -57,8 +45,6 @@
 		aa_put_label(ctx->nnp);
 		aa_put_label(ctx->previous);
 		aa_put_label(ctx->onexec);
-
-		kzfree(ctx);
 	}
 }