Kernel utility functions
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Chapter 1. Driver Basics
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Kernel utility functions
upper_32_bits
- return bits 32-63 of a number
lower_32_bits
- return bits 0-31 of a number
might_sleep
- annotation for functions that can sleep
trace_printk
- printf formatting in the ftrace buffer
min_not_zero
- return the minimum that is _not_ zero, unless both are zero
clamp
- return a value clamped to a given range with strict typechecking
clamp_t
- return a value clamped to a given range using a given type
clamp_val
- return a value clamped to a given range using val's type
container_of
- cast a member of a structure out to the containing structure
BUILD_BUG_ON
- break compile if a condition is true.
printk
- print a kernel message
console_lock
- lock the console system for exclusive use.
console_trylock
- try to lock the console system for exclusive use.
console_unlock
- unlock the console system
console_conditional_schedule
- yield the CPU if required
printk_timed_ratelimit
- caller-controlled printk ratelimiting
kmsg_dump_register
- register a kernel log dumper.
kmsg_dump_unregister
- unregister a kmsg dumper.
panic
- halt the system
emergency_restart
- reboot the system
kernel_restart
- reboot the system
kernel_halt
- halt the system
kernel_power_off
- power_off the system
orderly_poweroff
- Trigger an orderly system poweroff
rcu_read_lock_bh_held
- might we be in RCU-bh read-side critical section?
init_rcu_head_on_stack
- initialize on-stack rcu_head for debugobjects
destroy_rcu_head_on_stack
- destroy on-stack rcu_head for debugobjects