linux-kernel - Re: [PATCH 03/21] x86/mm: factor out phys_pgd

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Message-ID: <DD6ZFZGBMSLA.7BSBIIJN0SLP@google.com>
Date: Wed, 01 Oct 2025 12:26:00 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: kernel test robot <lkp@...el.com>, Brendan Jackman <jackmanb@...gle.com>, 
	Andy Lutomirski <luto@...nel.org>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Suren Baghdasaryan <surenb@...gle.com>, 
	Michal Hocko <mhocko@...e.com>, Johannes Weiner <hannes@...xchg.org>, Zi Yan <ziy@...dia.com>, 
	Axel Rasmussen <axelrasmussen@...gle.com>, Yuanchu Xie <yuanchu@...gle.com>, 
	Roman Gushchin <roman.gushchin@...ux.dev>
Cc: <llvm@...ts.linux.dev>, <oe-kbuild-all@...ts.linux.dev>, <bp@...en8.de>, 
	<dave.hansen@...ux.intel.com>, <mingo@...hat.com>, <tglx@...utronix.de>, 
	<akpm@...ux-foundation.org>, <david@...hat.com>, <derkling@...gle.com>, 
	<junaids@...gle.com>, <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>, 
	<reijiw@...gle.com>, <rientjes@...gle.com>, <rppt@...nel.org>, 
	<vbabka@...e.cz>, <x86@...nel.org>, <yosry.ahmed@...ux.dev>
Subject: Re: [PATCH 03/21] x86/mm: factor out phys_pgd_init()

On Sat Sep 27, 2025 at 7:29 PM UTC, kernel test robot wrote:
> Hi Brendan,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on bf2602a3cb2381fb1a04bf1c39a290518d2538d1]

I've fixed this and the others in my WIP branch but I will wait a bit
longer before sending a v2..

They're all real issues - one of them confirms I have not exercised the
CMA with this code (by demonstrating that I did not even compile with
CONFIG_CMA=y). This one is just a benign bug that only shows up with
W=1.