Re: [PATCH v2 01/23] x86/fpu: Extend fpu_xstate_prctl() with guest permissions

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

On Fri, Dec 17 2021 at 07:29, Jing Liu wrote:
>  
> -static int __xstate_request_perm(u64 permitted, u64 requested)
> +static int __xstate_request_perm(u64 permitted, u64 requested, bool guest)
>  {
>  	/*
>  	 * This deliberately does not exclude !XSAVES as we still might
> @@ -1605,6 +1605,7 @@ static int __xstate_request_perm(u64 permitted, u64 requested)
>  	 */
>  	bool compacted = cpu_feature_enabled(X86_FEATURE_XSAVES);
>  	struct fpu *fpu = &current->group_leader->thread.fpu;
> +	struct fpu_state_perm *perm;
>  	unsigned int ksize, usize;
>  	u64 mask;
>  	int ret;

needs to be

      int ret = 0;

Do not blindly copy code from that Gleixner dude...

Thanks,

        tglx