linux-kernel - Re: [PATCH v8 06/26] x86/fpu/xstate: Create guest fpstate with guest specific config

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Date: Wed, 3 Jan 2024 18:16:48 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "Yang, Weijiang"
	<weijiang.yang@...el.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>,
	"seanjc@...gle.com" <seanjc@...gle.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "Hansen, Dave" <dave.hansen@...el.com>
CC: "john.allen@....com" <john.allen@....com>, "peterz@...radead.org"
	<peterz@...radead.org>, "Gao, Chao" <chao.gao@...el.com>,
	"mlevitsk@...hat.com" <mlevitsk@...hat.com>
Subject: Re: [PATCH v8 06/26] x86/fpu/xstate: Create guest fpstate with guest
 specific config

On Thu, 2023-12-21 at 09:02 -0500, Yang Weijiang wrote:
>  #if IS_ENABLED(CONFIG_KVM)
> -static void __fpstate_reset(struct fpstate *fpstate, u64 xfd);
> -
>  static void fpu_init_guest_permissions(struct fpu_guest *gfpu)
>  {
>         struct fpu_state_perm *fpuperm;
> @@ -272,25 +270,54 @@ static void fpu_init_guest_permissions(struct
> fpu_guest *gfpu)
>         gfpu->perm = perm & ~FPU_GUEST_PERM_LOCKED;
>  }
>  
> -bool fpu_alloc_guest_fpstate(struct fpu_guest *gfpu)
> +static struct fpstate *__fpu_alloc_init_guest_fpstate(struct
> fpu_guest *gfpu)
>  {
> +       bool compacted = cpu_feature_enabled(X86_FEATURE_XCOMPACTED);

With CONFIG_WERROR I get:
arch/x86/kernel/fpu/core.c: In function
‘__fpu_alloc_init_guest_fpstate’:
arch/x86/kernel/fpu/core.c:275:14: error: unused variable ‘compacted’
[-Werror=unused-variable]
275 |         bool compacted =
cpu_feature_enabled(X86_FEATURE_XCOMPACTED);