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From: Rohan McLure <rmclure@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: x86@kernel.org, linux-mm@kvack.org,
	Rohan McLure <rmclure@linux.ibm.com>,
	linux-riscv@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v11 08/11] powerpc: mm: Add pud_pfn() stub
Date: Thu, 28 Mar 2024 15:55:28 +1100	[thread overview]
Message-ID: <20240328045535.194800-11-rmclure@linux.ibm.com> (raw)
In-Reply-To: <20240328045535.194800-3-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>
---
v11: pud_pfn() stub has been removed upstream as it has valid users now
in transparent hugepages. Create a BUG_ON() for other, non Book3S64
platforms.
---
 arch/powerpc/include/asm/pgtable.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 239709a2f68e..ee8c82c0528f 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -211,6 +211,14 @@ 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();
+}
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_PGTABLE_H */
-- 
2.44.0


  parent reply	other threads:[~2024-03-28  5:04 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-28  4:55 [PATCH v11 00/11] Support page table check PowerPC Rohan McLure
2024-03-28  4:55 ` [PATCH v11 01/11] Revert "mm/page_table_check: remove unused parameter in [__]page_table_check_pud_set" Rohan McLure
2024-03-28  4:55 ` [PATCH v11 02/11] Revert "mm/page_table_check: remove unused parameter in [__]page_table_check_pmd_set" Rohan McLure
2024-03-28  4:55 ` [PATCH v11 03/11] mm: Provide addr parameter to page_table_check_pte_set() Rohan McLure
2024-03-28  4:55 ` [PATCH v11 04/11] Revert "mm/page_table_check: remove unused parameter in [__]page_table_check_pud_clear" Rohan McLure
2024-03-28  4:55 ` [PATCH v11 05/11] Revert "mm/page_table_check: remove unused parameter in [__]page_table_check_pmd_clear" Rohan McLure
2024-03-28  4:55 ` [PATCH v11 06/11] Revert "mm/page_table_check: remove unused parameter in [__]page_table_check_pte_clear" Rohan McLure
2024-03-28  4:55 ` [PATCH v11 07/11] mm: Provide address parameter to p{te,md,ud}_user_accessible_page() Rohan McLure
2024-03-28  4:55 ` Rohan McLure [this message]
2024-03-28  5:33   ` [PATCH v11 08/11] powerpc: mm: Add pud_pfn() stub Christophe Leroy
2024-03-28  4:55 ` [PATCH v11 09/11] poweprc: mm: Implement *_user_accessible_page() for ptes Rohan McLure
2024-03-28  5:40   ` Christophe Leroy
2024-03-28  5:44     ` Rohan McLure
2024-03-28  4:55 ` [PATCH v11 10/11] powerpc: mm: Use set_pte_at_unchecked() for early-boot / internal usages Rohan McLure
2024-03-28  4:55 ` [PATCH v11 11/11] powerpc: mm: Support page table check Rohan McLure
2024-03-28  6:52 ` [PATCH v11 00/11] Support page table check PowerPC Christophe Leroy
2024-03-28  7:57   ` Christophe Leroy
2024-03-29  8:29     ` Christophe Leroy
2024-03-28  9:28 ` Ingo Molnar
2024-04-02  3:00   ` Rohan McLure

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