CONFIG_EFI_DISABLE_RUNTIME: Disable EFI runtime services support by default

General informations

The Linux kernel configuration item CONFIG_EFI_DISABLE_RUNTIME:

• prompt: Disable EFI runtime services support by default
• type: bool
• depends on: CONFIG_PREEMPT_RT
• defined in drivers/firmware/efi/Kconfig
• found in Linux kernels: 5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

Allow to disable the EFI runtime services support by default. This can already be achieved by using the efi=noruntime option, but it could be useful to have this default without any kernel command line parameter.

The EFI runtime services are disabled by default when PREEMPT_RT is enabled, because measurements have shown that some EFI functions calls might take too much time to complete, causing large latencies which is an issue for Real-Time kernels.

This default can be overridden by using the efi=runtime option.

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This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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