check_preemption_disabled

Name:check_preemption_disabled

Proto:notrace static inline __attribute__((__always_inline__)) unsigned int check_preemption_disabled(const char *what1, const char *what2)

Type:unsigned int

Parameter:

Type	Parameter	Name
const char *	what1
const char *	what2

14

this_cpu = These macros fold the SMP functionality into a single CPU system()

16

If Value is more likely to compile time(We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users* that think a non-zero value indicates we cannot preempt.) Then Go to out

19

If Some architectures don't define arch_irqs_disabled(), so even if either* definition would be fine we need to use different ones for the time being* to avoid build issues.() Then Go to out

26

If nr_cpus_allowed == 1 Then Go to out

32

If Values used for system_state. Ordering of the states must not be changed* as code checks for <, <=, >, >= STATE. < SYSTEM_SCHEDULING Then Go to out

38

preempt_disable_notrace()

40

If Not printk_ratelimit() Then Go to out_enable

43

printk(r conditions "BUG: using %s%s() in preemptible [%08x] code: %s/%d\n", what1, what2, We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users* that think a non-zero value indicates we cannot preempt. - 1, comm, pid)

46

printk("caller is %pS\n", __builtin_return_address(0))

47

49

50

preempt_enable_no_resched_notrace()

51

out :

52

Return this_cpu

**Caller**
Name	Describe
debug_smp_processor_id
__this_cpu_preempt_check

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