#include <linux/linkage.h>
#include <linux/list.h>
+static __always_inline int preempt_count(void)
+{
+ return current_thread_info()->preempt_count;
+}
+
+static __always_inline int *preempt_count_ptr(void)
+{
+ return ¤t_thread_info()->preempt_count;
+}
+
+static __always_inline void preempt_count_set(int pc)
+{
+ *preempt_count_ptr() = pc;
+}
+
#if defined(CONFIG_DEBUG_PREEMPT) || defined(CONFIG_PREEMPT_TRACER)
extern void add_preempt_count(int val);
extern void sub_preempt_count(int val);
#else
-# define add_preempt_count(val) do { preempt_count() += (val); } while (0)
-# define sub_preempt_count(val) do { preempt_count() -= (val); } while (0)
+# define add_preempt_count(val) do { *preempt_count_ptr() += (val); } while (0)
+# define sub_preempt_count(val) do { *preempt_count_ptr() -= (val); } while (0)
#endif
#define inc_preempt_count() add_preempt_count(1)
#define dec_preempt_count() sub_preempt_count(1)
-#define preempt_count() (current_thread_info()->preempt_count)
-
#ifdef CONFIG_PREEMPT
asmlinkage void preempt_schedule(void);
/* For debugging and tracer internals only! */
#define add_preempt_count_notrace(val) \
- do { preempt_count() += (val); } while (0)
+ do { *preempt_count_ptr() += (val); } while (0)
#define sub_preempt_count_notrace(val) \
- do { preempt_count() -= (val); } while (0)
+ do { *preempt_count_ptr() -= (val); } while (0)
#define inc_preempt_count_notrace() add_preempt_count_notrace(1)
#define dec_preempt_count_notrace() sub_preempt_count_notrace(1)
if (preempt_count() != count) {
sprintf(msgbuf, "preemption imbalance ");
- preempt_count() = count;
+ preempt_count_set(count);
}
if (irqs_disabled()) {
strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
if (DEBUG_LOCKS_WARN_ON((preempt_count() < 0)))
return;
#endif
- preempt_count() += val;
+ add_preempt_count_notrace(val);
#ifdef CONFIG_DEBUG_PREEMPT
/*
* Spinlock count overflowing soon?
if (preempt_count() == val)
trace_preempt_on(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
- preempt_count() -= val;
+ sub_preempt_count_notrace(val);
}
EXPORT_SYMBOL(sub_preempt_count);
* We must manually increment preempt_count here and manually
* call the trace_preempt_off later.
*/
- preempt_count() += cnt;
+ add_preempt_count_notrace(cnt);
/*
* Were softirqs turned off above:
*/
" exited with %08x?\n", vec_nr,
softirq_to_name[vec_nr], h->action,
prev_count, preempt_count());
- preempt_count() = prev_count;
+ preempt_count_set(prev_count);
}
rcu_bh_qs(cpu);
static void call_timer_fn(struct timer_list *timer, void (*fn)(unsigned long),
unsigned long data)
{
- int preempt_count = preempt_count();
+ int count = preempt_count();
#ifdef CONFIG_LOCKDEP
/*
lock_map_release(&lockdep_map);
- if (preempt_count != preempt_count()) {
+ if (count != preempt_count()) {
WARN_ONCE(1, "timer: %pF preempt leak: %08x -> %08x\n",
- fn, preempt_count, preempt_count());
+ fn, count, preempt_count());
/*
* Restore the preempt count. That gives us a decent
* chance to survive and extract information. If the
* callback kept a lock held, bad luck, but not worse
* than the BUG() we had.
*/
- preempt_count() = preempt_count;
+ preempt_count_set(count);
}
}
* Some tests (e.g. double-unlock) might corrupt the preemption
* count, so restore it:
*/
- preempt_count() = saved_preempt_count;
+ preempt_count_set(saved_preempt_count);
#ifdef CONFIG_TRACE_IRQFLAGS
if (softirq_count())
current->softirqs_enabled = 0;
notrace unsigned int debug_smp_processor_id(void)
{
- unsigned long preempt_count = preempt_count();
int this_cpu = raw_smp_processor_id();
- if (likely(preempt_count))
+ if (likely(preempt_count()))
goto out;
if (irqs_disabled())