[PATCH v14 08/11] powerpc: mm: Add pud_pfn() stub

* [PATCH v14 08/11] powerpc: mm: Add pud_pfn() stub
  2025-04-11  5:43 [PATCH v14 00/11] Support page table check on PowerPC Andrew Donnellan
@ 2025-04-11  5:43   ` Andrew Donnellan
  0 siblings, 0 replies; 3+ messages in thread
From: Andrew Donnellan @ 2025-04-11  5:43 UTC (permalink / raw)
  To: linuxppc-dev
  Cc: x86, linux-mm, linux-riscv, linux-arm-kernel, linux-kernel,
	pasha.tatashin, sweettea-kernel, christophe.leroy

From: Rohan McLure <rmclure@linux.ibm.com>

The page table check feature requires that pud_pfn() be defined
on each consuming architecture. Since only 64-bit, Book3S platforms
allow for hugepages at this upper level, and since the calling code is
gated by a call to pud_user_accessible_page(), which will return zero,
include this stub as a BUILD_BUG().

Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Andrew Donnellan <ajd@linux.ibm.com>
---
 arch/powerpc/include/asm/pgtable.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 2f72ad885332..bb43e4f46367 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -215,6 +215,15 @@ static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size)
 
 #endif /* CONFIG_PPC64 */
 
+#ifndef pud_pfn
+#define pud_pfn pud_pfn
+static inline int pud_pfn(pud_t pud)
+{
+	BUILD_BUG();
+	return 0;
+}
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_PGTABLE_H */
-- 
2.49.0



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