linux-kernel - Re: [PATCH v9 08/26] x86/fpu/xstate: Introduce helpers to manage the XSTATE buffer dynamically

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Date:   Mon, 16 Aug 2021 18:33:37 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     "Lutomirski, Andy" <luto@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "Brown, Len" <len.brown@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Macieira, Thiago" <thiago.macieira@...el.com>,
        "Liu, Jing2" <jing2.liu@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 08/26] x86/fpu/xstate: Introduce helpers to manage the
 XSTATE buffer dynamically

On Aug 12, 2021, at 12:44, Borislav Petkov <bp@...en8.de> wrote:
> On Fri, Jul 30, 2021 at 07:59:39AM -0700, Chang S. Bae wrote:
>> 
>> +	if (boot_cpu_has(X86_FEATURE_XSAVES))
> 
> cpu_feature_enabled

Without DISABLE_XSAVES or something under ifdef CONFIG_X86_XX in
$arch/x86/include/asm/disable-features.h, I don’t see the difference with this
macro. Am I missing anything here? Or, boot_cpu_has() is going to be
deprecated everywhere?

Thanks,
Chang