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