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

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Message-ID: <aRYE_Z-x_RUKkqUS@arm.com>
Date: Thu, 13 Nov 2025 16:19:09 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Anshuman Khandual <anshuman.khandual@....com>
Cc: Will Deacon <will@...nel.org>, linux-arm-kernel@...ts.infradead.org,
	ryan.roberts@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64/mm: Add a fallback stub for pgd_page_paddr()

On Thu, Nov 06, 2025 at 07:29:55AM +0530, Anshuman Khandual wrote:
> On 05/11/25 10:33 PM, Will Deacon wrote:
> > So my question is, would such a user compile today? If not, then your
> > patch is pointless.
> 
> The point is this macro is not visible outside #ifdef PGTBALE_LEVELS > 4
> where as similar ones such as p4d_page_paddr() and pud_page_paddr() are
> always visible via their respective fallback stubs, when PGTABLE_LEVELS
> are lower.

Yes but we needed the p4d/pud fallbacks to be able to use them in
functions like early_fixmap_init_pud() without #ifdefs. We don't have
such a case for pgd_page_paddr(), so I don't think this patch makes
sense on its own.

-- 
Catalin