linux-kernel - Re: [PATCH] x86/fpu: Remove dynamic features from xcomp_bv for init

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Message-ID: <2b596039-578e-be9a-792d-5f706ca9c238@intel.com>
Date:   Thu, 13 Oct 2022 21:26:07 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     "Yao, Yuan" <yuan.yao@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/fpu: Remove dynamic features from xcomp_bv for
 init_fpstate

On 10/13/2022 9:10 PM, Yao, Yuan wrote:
> 
> Does init_fpstate saves the "init" state for all non-dynamic components in its buffer ? 

For legacy states :)

	 * ... But doing so is a pointless exercise because most
	 * components have an all zeros init state except for the legacy
	 * ones (FP and SSE).

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/kernel/fpu/xstate.c#n379

Thanks,
Chang