linux-kernel - Re: [PATCH] arm64/mm: Add a fallback stub for pgd_page

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Message-ID: <e660e033-6300-4deb-b034-4d26746d8d01@arm.com>
Date: Wed, 5 Nov 2025 08:24:40 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, ryan.roberts@....com,
 Catalin Marinas <catalin.marinas@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/mm: Add a fallback stub for pgd_page_paddr()

On 04/11/25 8:01 PM, Will Deacon wrote:
> On Tue, Oct 14, 2025 at 12:06:33PM +0100, Anshuman Khandual wrote:
>> Add a fallback stub for pgd_page_paddr() when (PGTBALE_LEVELS <= 4) which
> 
> typo

Sure will change - s/Add/Adds
> 
>> helps in intercepting any unintended usage and which is also in line with
>> existing stubs for similar [pud|p4d]_page_paddr() helpers.
> 
> Are you saying the kernel compiles in this case without your patch? Which
> definition of pgd_page_paddr() does it end up using?

Kernel compiles for PGTBALE_LEVELS <= 4 just fine without this patch as both
its current users p4d_offset_phys() and p4d_offset_lockless() are wrapped in
with PGTBALE_LEVELS > 4.