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

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Message-Id: <20251014110633.304961-1-anshuman.khandual@arm.com>
Date: Tue, 14 Oct 2025 12:06:33 +0100
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: ryan.roberts@....com,
	Anshuman Khandual <anshuman.khandual@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64/mm: Add a fallback stub for pgd_page_paddr()

Add a fallback stub for pgd_page_paddr() when (PGTBALE_LEVELS <= 4) which
helps in intercepting any unintended usage and which is also in line with
existing stubs for similar [pud|p4d]_page_paddr() helpers.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/arm64/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index aa89c2e67ebc..fb34df92d159 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1212,6 +1212,8 @@ static inline p4d_t *p4d_offset_kimg(pgd_t *pgdp, u64 addr)
 
 static inline bool pgtable_l5_enabled(void) { return false; }
 
+#define pgd_page_paddr(pgd)	({ BUILD_BUG(); 0; })
+
 #define p4d_index(addr)		(((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
 
 /* Match p4d_offset folding in <asm/generic/pgtable-nop4d.h> */
-- 
2.30.2