Re: [PATCH] efi: Allow to enable EFI runtime services with PREEMPT_RT

[Sebastian Andrzej Siewior]

On 2022-03-31 16:10:38 [+0200], Javier Martinez Canillas wrote:
> Commit d9f283ae71af ("efi: Disable runtime services on RT") disabled EFI
> runtime services when the CONFIG_PREEMPT_RT option is enabled.
> 
> The rationale for the change is that some EFI calls could take too much
> time, leading to large latencies which are an issue for RT kernels.
> 
> But a side effect of that commit is that now is not possible anymore to
> enable the EFI runtime services by default when CONFIG_PREEMPT_RT is set
> to y, even for platforms that could guarantee bounded time for EFI calls.
> 
> Instead, let's add a new EFI_DISABLE_RUNTIME boolean Kconfig option, that
> would be set to n by default but to y if CONFIG_PREEMPT_RT is enabled.
> 
> That way, the current behaviour is preserved but gives users a mechanism
> to enable the EFI runtimes services in their kernels if that is required.

Is the command line switch
	efi=runtime

not working?

Sebastian