linux-kernel - [RFC/INCOMPLETE 01/13] context_tracking: Add context_tracking_assert

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Message-Id: <1d95640676a92a5ff7382e9c87517c12ea23ccd9.1434485184.git.luto@kernel.org>
Date:	Tue, 16 Jun 2015 13:16:47 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Frédéric Weisbecker <fweisbec@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	Borislav Petkov <bp@...en8.de>,
	Kees Cook <keescook@...omium.org>,
	Brian Gerst <brgerst@...il.com>,
	Andy Lutomirski <luto@...nel.org>
Subject: [RFC/INCOMPLETE 01/13] context_tracking: Add context_tracking_assert_state

This will let us sprinkle sanity checks around the kernel without
making too much of a mess.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
 include/linux/context_tracking.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 2821838256b4..0fbea4b152e1 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -57,6 +57,13 @@ static inline void context_tracking_task_switch(struct task_struct *prev,
 	if (context_tracking_is_enabled())
 		__context_tracking_task_switch(prev, next);
 }
+
+static inline void context_tracking_assert_state(enum ctx_state state)
+{
+	rcu_lockdep_assert(!context_tracking_is_enabled() ||
+			   this_cpu_read(context_tracking.state) == state,
+			   "context tracking state was wrong");
+}
 #else
 static inline void user_enter(void) { }
 static inline void user_exit(void) { }
@@ -64,6 +71,7 @@ static inline enum ctx_state exception_enter(void) { return 0; }
 static inline void exception_exit(enum ctx_state prev_ctx) { }
 static inline void context_tracking_task_switch(struct task_struct *prev,
 						struct task_struct *next) { }
+static inline void context_tracking_assert_state(enum ctx_state state) { }
 #endif /* !CONFIG_CONTEXT_TRACKING */
 
 
-- 
2.4.3

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