Re: [PATCH v4 2/8] x86/fpu: Drop @perm from guest pseudo FPU container

[Chang S. Bae]

On 3/18/2025 8:31 AM, Chao Gao wrote:
>   
> -static void fpu_init_guest_permissions(struct fpu_guest *gfpu)
> +static void fpu_lock_guest_permissions(struct fpu_guest *gfpu)
>   {
>   	struct fpu_state_perm *fpuperm;
>   	u64 perm;
> @@ -218,8 +218,6 @@ static void fpu_init_guest_permissions(struct fpu_guest *gfpu)
>   	WRITE_ONCE(fpuperm->__state_perm, perm | FPU_GUEST_PERM_LOCKED);
>   
>   	spin_unlock_irq(&current->sighand->siglock);
> -
> -	gfpu->perm = perm & ~FPU_GUEST_PERM_LOCKED;
>   }

With the removal, the function no longer requires a struct fpu_guest 
argument as it now operates solely on the group leader's FPU state.

Thanks,
Chang