linux-kernel - [PATCH v6 03/18] mm: Introduce pte_advance_pfn() and use for pte_next

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Message-Id: <20240215103205.2607016-4-ryan.roberts@arm.com>
Date: Thu, 15 Feb 2024 10:31:50 +0000
From: Ryan Roberts <ryan.roberts@....com>
To: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Ard Biesheuvel <ardb@...nel.org>,
	Marc Zyngier <maz@...nel.org>,
	James Morse <james.morse@....com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Mark Rutland <mark.rutland@....com>,
	David Hildenbrand <david@...hat.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	John Hubbard <jhubbard@...dia.com>,
	Zi Yan <ziy@...dia.com>,
	Barry Song <21cnbao@...il.com>,
	Alistair Popple <apopple@...dia.com>,
	Yang Shi <shy828301@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc: Ryan Roberts <ryan.roberts@....com>,
	linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v6 03/18] mm: Introduce pte_advance_pfn() and use for pte_next_pfn()

The goal is to be able to advance a PTE by an arbitrary number of PFNs.
So introduce a new API that takes a nr param. Define the default
implementation here and allow for architectures to override.
pte_next_pfn() becomes a wrapper around pte_advance_pfn().

Follow up commits will convert each overriding architecture's
pte_next_pfn() to pte_advance_pfn().

Signed-off-by: Ryan Roberts <ryan.roberts@....com>
---
 include/linux/pgtable.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 231370e1b80f..b7ac8358f2aa 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -212,14 +212,17 @@ static inline int pmd_dirty(pmd_t pmd)
 #define arch_flush_lazy_mmu_mode()	do {} while (0)
 #endif
 
-
 #ifndef pte_next_pfn
-static inline pte_t pte_next_pfn(pte_t pte)
+#ifndef pte_advance_pfn
+static inline pte_t pte_advance_pfn(pte_t pte, unsigned long nr)
 {
-	return __pte(pte_val(pte) + (1UL << PFN_PTE_SHIFT));
+	return __pte(pte_val(pte) + (nr << PFN_PTE_SHIFT));
 }
 #endif
 
+#define pte_next_pfn(pte) pte_advance_pfn(pte, 1)
+#endif
+
 #ifndef set_ptes
 /**
  * set_ptes - Map consecutive pages to a contiguous range of addresses.
-- 
2.25.1