:orphan:

.. title:: CONFIG_ISR_SUBSTACK_SIZE

.. kconfig:: CONFIG_ISR_SUBSTACK_SIZE

CONFIG_ISR_SUBSTACK_SIZE
########################

*Size of ISR substacks*

Type: ``int``

Help
====

.. code-block:: none

    Number of bytes from the ISR stack to reserve for each nested IRQ
    level. Must be a multiple of 16 to main stack alignment. Note that
    CONFIG_ISR_SUBSTACK_SIZE * CONFIG_ISR_DEPTH must be equal to
    CONFIG_ISR_STACK_SIZE.

Direct dependencies
===================

\ :kconfig:`X86_64 <CONFIG_X86_64>` && \ :kconfig:`X86 <CONFIG_X86>`

*(Includes any dependencies from ifs and menus.)*

Default
=======

- 4096

Kconfig definition
==================



At ``<Zephyr Architecture>/x86/core/Kconfig.intel64:63``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:39`` → ``<Zephyr Architecture>/Kconfig:12`` → ``<Zephyr Architecture>/x86/Kconfig:483``

Menu path: (Top) → X86 Architecture Options

.. code-block:: kconfig

    config ISR_SUBSTACK_SIZE
    	int "Size of ISR substacks"
    	default 4096
    	depends on X86_64 && X86
    	help
    	  Number of bytes from the ISR stack to reserve for each nested IRQ
    	  level. Must be a multiple of 16 to main stack alignment. Note that
    	  CONFIG_ISR_SUBSTACK_SIZE * CONFIG_ISR_DEPTH must be equal to
    	  CONFIG_ISR_STACK_SIZE.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*