diff options
Diffstat (limited to 'kernel/context_tracking.c')
| -rw-r--r-- | kernel/context_tracking.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c index 247091bf058..5664985c46a 100644 --- a/kernel/context_tracking.c +++ b/kernel/context_tracking.c @@ -19,6 +19,7 @@ #include <linux/sched.h> #include <linux/hardirq.h> #include <linux/export.h> +#include <linux/kprobes.h> #define CREATE_TRACE_POINTS #include <trace/events/context_tracking.h> @@ -51,6 +52,15 @@ void context_tracking_user_enter(void) unsigned long flags; /* + * Repeat the user_enter() check here because some archs may be calling + * this from asm and if no CPU needs context tracking, they shouldn't + * go further. Repeat the check here until they support the inline static + * key check. + */ + if (!context_tracking_is_enabled()) + return; + + /* * Some contexts may involve an exception occuring in an irq, * leading to that nesting: * rcu_irq_enter() rcu_user_exit() rcu_user_exit() rcu_irq_exit() @@ -95,6 +105,7 @@ void context_tracking_user_enter(void) } local_irq_restore(flags); } +NOKPROBE_SYMBOL(context_tracking_user_enter); #ifdef CONFIG_PREEMPT /** @@ -111,7 +122,7 @@ void context_tracking_user_enter(void) * instead of preempt_schedule() to exit user context if needed before * calling the scheduler. */ -void __sched notrace preempt_schedule_context(void) +asmlinkage __visible void __sched notrace preempt_schedule_context(void) { enum ctx_state prev_ctx; @@ -151,6 +162,9 @@ void context_tracking_user_exit(void) { unsigned long flags; + if (!context_tracking_is_enabled()) + return; + if (in_interrupt()) return; @@ -169,6 +183,7 @@ void context_tracking_user_exit(void) } local_irq_restore(flags); } +NOKPROBE_SYMBOL(context_tracking_user_exit); /** * __context_tracking_task_switch - context switch the syscall callbacks |