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

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Message-ID: <02e2bdf6-0b55-e944-532b-d93c89e5a822@intel.com>
Date:   Wed, 12 Oct 2022 18:47:31 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>,
        <linux-kernel@...r.kernel.org>
CC:     <x86@...nel.org>, Yuan Yao <yuan.yao@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/fpu: Remove dynamic features from xcomp_bv for
 init_fpstate

On 10/11/2022 3:24 PM, Dave Hansen wrote:
> 
> Please let me know if this looks OK.  I'd also especially
> appreciate some testing from folks that have AMX hardware
> handy.

The issue looks to be reproducible at boot time with 
CONFIG_DEBUG_PAGEALLOC=y and CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT=y. 
Folks found this.

With the patch, I don't see the splat anymore.

Tested-by Chang S. Bae <chang.seok.bae@...el.com>

Thanks,
Chang