Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f9281648 authored by Andy Lutomirski's avatar Andy Lutomirski Committed by Ingo Molnar
Browse files

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: default avatarAndy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/5da41fb2ceb29eac671f427c67040401ba2a1fa0.1435952415.git.luto@kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent ccaee5f8

include/linux/context_tracking.h

+15 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/context_tracking_state.h

+1 −0
Original line number Diff line number Diff line
@@ -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,