linux-kernel - Re: [PATCH v2] selftests: x86: skip the tests if prerequisites aren't fulfilled

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Date: Tue, 26 Mar 2024 14:20:16 -0700
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: Shuah Khan <skhan@...uxfoundation.org>, Muhammad Usama Anjum
	<usama.anjum@...labora.com>, Shuah Khan <shuah@...nel.org>, "Kirill A.
 Shutemov" <kirill.shutemov@...ux.intel.com>, Dave Hansen
	<dave.hansen@...ux.intel.com>, Binbin Wu <binbin.wu@...ux.intel.com>, "Peter
 Zijlstra (Intel)" <peterz@...radead.org>, Weihong Zhang
	<weihong.zhang@...el.com>, angquan yu <angquan21@...il.com>
CC: <kernel@...labora.com>, <linux-kselftest@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] selftests: x86: skip the tests if prerequisites aren't
 fulfilled

On 3/26/2024 1:51 PM, Shuah Khan wrote:
> 
> show that there are bo backwards compatibility issues
In older kernels lacking AMX support [1], arch_prctl() returns EINVAL. 
With AMX support, the kernel will properly set 'features'.

It is also worth noting that this simplification was previously 
acknowledged [2], albeit some time ago.

Thanks,
Chang

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=db8268df0983adc2bb1fb48c9e5f7bfbb5f617f3
[2] 
https://lore.kernel.org/lkml/de61ffdb-638a-ca84-31b5-55f6a8616597@linuxfoundation.org/