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CONFIG_EFI_DISABLE_RUNTIME: Disable EFI runtime services support by default

General informations

The Linux kernel configuration item CONFIG_EFI_DISABLE_RUNTIME:

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.

Hardware

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