svn commit: r359726 - head/sys/compat/linuxkpi/common/include/linux

[Hans Petter Selasky]

Author: hselasky
Date: Wed Apr  8 16:07:57 2020
New Revision: 359726
URL: https://svnweb.freebsd.org/changeset/base/359726

Log:
  Some fixes for SRCU in the LinuxKPI.
  
  - Make sure to use READ_ONCE() when deferring variables.
  - Remove superfluous zero initializer.
  
  MFC after:	1 week
  Sponsored by:	Mellanox Technologies

Modified:
  head/sys/compat/linuxkpi/common/include/linux/srcu.h

Modified: head/sys/compat/linuxkpi/common/include/linux/srcu.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/srcu.h	Wed Apr  8 14:11:54 2020	(r359725)
+++ head/sys/compat/linuxkpi/common/include/linux/srcu.h	Wed Apr  8 16:07:57 2020	(r359726)
@@ -1,5 +1,5 @@
 /*-
- * Copyright (c) 2015-2017 Mellanox Technologies, Ltd.
+ * Copyright (c) 2015-2020 Mellanox Technologies, Ltd.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -29,13 +29,16 @@
 #ifndef	_LINUX_SRCU_H_
 #define	_LINUX_SRCU_H_
 
+#include <linux/compiler.h>
+
 struct srcu_struct {
 };
 
-#define	srcu_dereference(ptr,srcu)	((__typeof(*(ptr)) *)(ptr))
+#define	srcu_dereference(p, srcu) \
+	((__typeof(*(p)) *)READ_ONCE(p))
 
 #define	DEFINE_STATIC_SRCU(name) \
-	static struct srcu_struct name = {}
+	static struct srcu_struct name
 
 /* prototypes */