linux-kernel - Re: [PATCH v2 01/15] x86/cpu: Move intel-family to arch-independent headers

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Date:   Mon, 11 Oct 2021 16:12:20 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Winiarska, Iwona" <iwona.winiarska@...el.com>,
        "bp@...en8.de" <bp@...en8.de>
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        "Lutomirski, Andy" <luto@...nel.org>,
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        "Williams, Dan J" <dan.j.williams@...el.com>,
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Subject: Re: [PATCH v2 01/15] x86/cpu: Move intel-family to arch-independent
 headers

On 10/11/21 1:53 PM, Winiarska, Iwona wrote:
>> If you're in include/linux/x86-hacks.h, what prevents you from doing
>>
>> #include "../../arch/x86/include/asm/intel-family.h"
>>
>> ?
>>
>> In the end, to the compiler, it's just a file in a weird location in the
>> tree.  I think I'd prefer one weird include to moving that file out of
>> arch/x86.
> Using relative includes in include/linux is uncommon (I can see just one usage
> in libfdt.h pulling stuff from scripts), so I thought I can't use it in this way
> (seems slightly hacky to pull stuff from outside include path).
> 
> But if that would be ok, it looks like a good alternative to avoid duplication
> in this case.

If you don't want to do it from a header, you can also do it directly
from a .c file that's outside of arch/x86.

I think that's a much better alternative than moving stuff elsewhere.