From: Paul E. McKenney <paulmck@kernel.org>
Date: Tue, 14 Apr 2020 17:19:02 +0000 (-0700)
Subject: rcu: Add KCSAN stubs to update.c
X-Git-Tag: v5.8-rc1~227^2~17^2^3~42
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=c76e7e0bce10876e6b08ac2ce8af5ef7cba684ff;p=linux.git

rcu: Add KCSAN stubs to update.c

This commit adds stubs for KCSAN's data_race(), ASSERT_EXCLUSIVE_WRITER(),
and ASSERT_EXCLUSIVE_ACCESS() macros to allow code using these macros
to move ahead.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---

diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 28a8bdc5072f..74a698aa9027 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -51,6 +51,19 @@
 #endif
 #define MODULE_PARAM_PREFIX "rcupdate."
 
+#ifndef data_race
+#define data_race(expr)							\
+	({								\
+		expr;							\
+	})
+#endif
+#ifndef ASSERT_EXCLUSIVE_WRITER
+#define ASSERT_EXCLUSIVE_WRITER(var) do { } while (0)
+#endif
+#ifndef ASSERT_EXCLUSIVE_ACCESS
+#define ASSERT_EXCLUSIVE_ACCESS(var) do { } while (0)
+#endif
+
 #ifndef CONFIG_TINY_RCU
 module_param(rcu_expedited, int, 0);
 module_param(rcu_normal, int, 0);