Help¶

When true, a spinlock will be taken around the output from a
single printk() call, preventing the output data from
interleaving with concurrent usage from another CPU or an
preempting interrupt.

Default¶

y if SMP && MP_NUM_CPUS > 1

Kconfig definition¶

At <Zephyr>/lib/os/Kconfig:54

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:33 → <Zephyr>/lib/Kconfig:10

Menu path: (Top) → Additional libraries → OS Support Library

config PRINTK_SYNC
    bool "Serialize printk() calls"
    default y if SMP && MP_NUM_CPUS > 1
    help
      When true, a spinlock will be taken around the output from a
      single printk() call, preventing the output data from
      interleaving with concurrent usage from another CPU or an
      preempting interrupt.

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)