linux-kernel - Re: [PATCH v4 2/2] selftests/x86/amx: Update the ARCH_REQ_XCOMP

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Date:   Wed, 23 Mar 2022 14:27:56 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        <linux-kernel@...r.kernel.org>, <x86@...nel.org>, <bp@...en8.de>,
        <dave.hansen@...ux.intel.com>, <mingo@...hat.com>
CC:     <yang.zhong@...el.com>, <ravi.v.shankar@...el.com>,
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v4 2/2] selftests/x86/amx: Update the ARCH_REQ_XCOMP_PERM
 test

On 3/23/2022 9:44 AM, Thomas Gleixner wrote:
> 
> Running it on a machine which does not have AMX results in:
> 
>   amx_64: [FAIL]	xstate cpuid: invalid tile data size/offset: 0/0: Success
> 
> It's not a failure, really. Selftests are supposed to run on all
> machines and the proper thing to do if a hardware feature is not
> available is to SKIP the test and return 0.

Ah, right. The test should be just *skipped* on non-AMX or even 
non-XSAVE systems.

Will follow up with a separate patch.

Thanks,
Chang