Re: [PATCH v6 05/25] x86/fpu/xstate: Remove kernel dynamic xfeatures from kernel default_features

[Dave Hansen]

On 9/13/23 23:33, Yang Weijiang wrote:
> --- a/arch/x86/kernel/fpu/xstate.c
> +++ b/arch/x86/kernel/fpu/xstate.c
> @@ -845,6 +845,7 @@ void __init fpu__init_system_xstate(unsigned int legacy_size)
>  	/* Clean out dynamic features from default */
>  	fpu_kernel_cfg.default_features = fpu_kernel_cfg.max_features;
>  	fpu_kernel_cfg.default_features &= ~XFEATURE_MASK_USER_DYNAMIC;
> +	fpu_kernel_cfg.default_features &= ~fpu_kernel_dynamic_xfeatures;

I'd much rather that this be a closer analog to XFEATURE_MASK_USER_DYNAMIC.

Please define a XFEATURE_MASK_KERNEL_DYNAMIC value and use it here.
Don't use a dynamically generated one.