Commit-ID: f9281648ecd5081803bb2da84b9ccb0cf48436cd
Gitweb: http://git.kernel.org/tip/f9281648ecd5081803bb2da84b9ccb0cf48436cd
Author: Andy Lutomirski <luto@xxxxxxxxxx>
AuthorDate: Fri, 3 Jul 2015 12:44:21 -0700
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 7 Jul 2015 10:59:04 +0200
context_tracking: Add ct_state() and CT_WARN_ON()
This will let us sprinkle sanity checks around the kernel
without making too much of a mess.
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: Denys Vlasenko <vda.linux@xxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: paulmck@xxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/5da41fb2ceb29eac671f427c67040401ba2a1fa0.1435952415.git.luto@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
include/linux/context_tracking.h | 15 +++++++++++++++
include/linux/context_tracking_state.h | 1 +
2 files changed, 16 insertions(+)
diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index b96bd29..008fc67 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -49,13 +49,28 @@ static inline void exception_exit(enum ctx_state prev_ctx)
}
}
+
+/**
+ * ct_state() - return the current context tracking state if known
+ *
+ * Returns the current cpu's context tracking state if context tracking
+ * is enabled. If context tracking is disabled, returns
+ * CONTEXT_DISABLED. This should be used primarily for debugging.
+ */
+static inline enum ctx_state ct_state(void)
+{
+ return context_tracking_is_enabled() ?
+ this_cpu_read(context_tracking.state) : CONTEXT_DISABLED;
+}
#else
static inline void user_enter(void) { }
static inline void user_exit(void) { }
static inline enum ctx_state exception_enter(void) { return 0; }
static inline void exception_exit(enum ctx_state prev_ctx) { }
+static inline enum ctx_state ct_state(void) { return CONTEXT_DISABLED; }
#endif /* !CONFIG_CONTEXT_TRACKING */
+#define CT_WARN_ON(cond) WARN_ON(context_tracking_is_enabled() && (cond))
#ifdef CONFIG_CONTEXT_TRACKING_FORCE
extern void context_tracking_init(void);
diff --git a/include/linux/context_tracking_state.h b/include/linux/context_tracking_state.h
index 678ecdf..ee956c5 100644
--- a/include/linux/context_tracking_state.h
+++ b/include/linux/context_tracking_state.h
@@ -14,6 +14,7 @@ struct context_tracking {
bool active;
int recursion;
enum ctx_state {
+ CONTEXT_DISABLED = -1, /* returned by ct_state() if unknown */
CONTEXT_KERNEL = 0,
CONTEXT_USER,
CONTEXT_GUEST,
--
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