linux-kernel - Re: [PATCH 4/6] x86/cpu: Add platform ID to CPU info structure

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Message-ID: <892113a8-d3ad-452c-8e4d-acbdacc31950@intel.com>
Date: Tue, 20 Jan 2026 12:48:24 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>, linux-kernel@...r.kernel.org,
 sohil.mehta@...el.com, Borislav Petkov <bp@...en8.de>,
 "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
 Jon Kohler <jon@...anix.com>, Pawan Gupta
 <pawan.kumar.gupta@...ux.intel.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Thomas Gleixner <tglx@...nel.org>, Tony Luck <tony.luck@...el.com>,
 x86@...nel.org
Subject: Re: [PATCH 4/6] x86/cpu: Add platform ID to CPU info structure

On 1/20/26 12:44, Andy Shevchenko wrote:
> On Tue, Jan 20, 2026 at 07:06:56AM -0800, Dave Hansen wrote:
>> On 1/20/26 00:27, Andy Shevchenko wrote:
>> ...
>>>> Note: This should not grow the size of 'struct cpuinfo_x86' in
>>>> practice since the u8 fits next to another u8 in the structure.
>>> Have you run `pahole` to confirm?
>> I have not. If you'd like to contribute to the series by compiling this
>> and running pahole on it, I'd very much appreciate it!
> Okay, here is the diff:
> 
> --- old	2026-01-20 21:40:39.170530703 +0100
> +++ new	2026-01-20 21:37:42.717138133 +0100
> @@ -19,8 +19,9 @@
>  	};
>  
>  	__u8                       x86_stepping;         /*     4     1 */
> +	__u8                       x86_platform_id;      /*     5     1 */

Thanks a lot for verifying that!

It appears that my built-in pahole is still working properly! Whew.