linux-kernel - RE: [RFC 03/10] platform/x86/intel/ifs: Add driver for In-Field Scan

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Message-ID: <2002880f24ca430ab51e9ca8bb07097d@intel.com>
Date:   Thu, 3 Mar 2022 00:02:45 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Williams, Dan J" <dan.j.williams@...el.com>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "markgross@...nel.org" <markgross@...nel.org>,
        "Joseph, Jithu" <jithu.joseph@...el.com>
CC:     "corbet@....net" <corbet@....net>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "patches@...ts.linux.dev" <patches@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "hpa@...or.com" <hpa@...or.com>, "bp@...en8.de" <bp@...en8.de>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: RE: [RFC 03/10] platform/x86/intel/ifs: Add driver for In-Field Scan

>> +config INTEL_IFS
>> +       tristate "Intel In Field Scan"
>> +       depends on X86 && 64BIT && SMP
>
> Are there actual CONFIG_SMP and CONFIG_64BIT compilation dependencies
> in this driver? It looks like this could compile without those config
> dependencies.

Maybe CONFIG_SMP is there as a kindness to kernel building robots :-)

Yes, you can build this for a UP kernel (I just did, and there were no build
errors). But why? Nobody is going to take their dual socket server with over
a hundred logical processors and run a UP kernel on it.

Probably ditto for 64BIT. I didn't try the build without that. But minimum
memory on these systems is larger than supported by 32-bit kernels.

-Tony