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From: Shuah Khan <skhan@linuxfoundation.org>
To: Reinette Chatre <reinette.chatre@intel.com>,
	dave.hansen@linux.intel.com, jarkko@kernel.org,
	linux-sgx@vger.kernel.org, shuah@kernel.org
Cc: linux-kselftest@vger.kernel.org, Shuah Khan <skhan@linuxfoundation.org>
Subject: Re: [PATCH V2] selftests/sgx: Fix build error caused by missing dependency
Date: Tue, 14 Dec 2021 14:55:14 -0700	[thread overview]
Message-ID: <b64a7830-d21a-fc61-b5ef-8938a97ce878@linuxfoundation.org> (raw)
In-Reply-To: <4dc1dd00-320b-e625-83db-70184141e9c9@intel.com>

On 12/14/21 2:28 PM, Reinette Chatre wrote:
> Hi Shuah,
> 
> On 12/14/2021 12:10 PM, Shuah Khan wrote:
> 
>>
>> Let's not add one more __cpuid() define to the individual tests.
>> We so far have:
>>
>> tools/testing/selftests/vm/pkey-x86.h
>> selftests/x86/corrupt_xstate_header.c
>>
>> Let's move the defines to kselftest.h and remove all these duplicate
>> defines.
>>
>> For now you could include vm/pkey-x86.h just to fix the build error
>> and do the proper cleanup.
> 
> Thank you so much for taking a look. We actually do have an alternative fix that could be considered for the other users of __cpuid(). Instead of another clone of the kernel's __cpuid() the fix includes cpuid.h and uses the existing __cpuid_count() from it.
> 
> Please see:
> https://lore.kernel.org/linux-sgx/20211204202355.23005-1-jarkko@kernel.org/
> 

This looks good to me.

> We decided against the above fix using __cpuid_count() because we could not explain why all the existing users of __cpuid() implement their own and decided to follow the custom instead ...
> 

Most likely, copy and paste and taking the easy route. I looked at a couple of
defines and I dont't see a difference. If there are differences, that would be
a bigger concern. The whole idea of not having duplicates is that we don't have
bugs in these duplicates.

> Do you see any problem with including cpuid.h into a selftest? If not, then we can go back to our original fix of this issue and I could also submit a change to remove all the __cpuid() clones and replace them with the library's __cpuid_count().
> 

There are no problems including cpuid.h - where is this though. I couldn't find
it in my cscope search?

thanks,
-- Shuah


  reply	other threads:[~2021-12-14 21:55 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-14 19:26 [PATCH V2] selftests/sgx: Fix build error caused by missing dependency Reinette Chatre
2021-12-14 20:10 ` Shuah Khan
2021-12-14 21:28   ` Reinette Chatre
2021-12-14 21:55     ` Shuah Khan [this message]
2021-12-14 22:27       ` Reinette Chatre
2021-12-14 22:59         ` Shuah Khan

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