linux-kernel - Re: [PATCH v13 1/3] x86/tdx: Add TDX Guest attestation interface driver

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Date:   Tue, 13 Sep 2022 08:21:22 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        "Huang, Kai" <kai.huang@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>, "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "wander@...hat.com" <wander@...hat.com>,
        "tim.gardner@...onical.com" <tim.gardner@...onical.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "khalid.elmously@...onical.com" <khalid.elmously@...onical.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "Cox, Philip" <philip.cox@...onical.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v13 1/3] x86/tdx: Add TDX Guest attestation interface
 driver

Hi,

On 9/13/22 2:01 AM, Dave Hansen wrote:
> On 9/12/22 19:44, Sathyanarayanan Kuppuswamy wrote:
>>> and include the header (<linux/string.h> ?) for memchr_inv()?
>> One of the previous headers includes linux/string.h (I am not sure which one).
>> So why include it explicitly?
> Because it's a best practice.  What happens is that you ride along on
> the coat tails of another #include, someone sees that include is no
> longer used and removes it.  Then, your code is busted on some weird
> .config.
> 
> *OR*, the header itself changes and doesn't #include the dependency you
> need.
> 
> I guess you can go add this advice to Documentation/ if it's not there
> already somewhere.

Ok. I will include it explicitly.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer