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From: Alexandre Ghiti <alexghiti@rivosinc.com>
To: Ryan Roberts <ryan.roberts@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
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Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: [PATCH 01/12] mm, arm64: Rename ARM64_CONTPTE to THP_CONTPTE
Date: Wed,  8 May 2024 21:19:20 +0200
Message-Id: <20240508191931.46060-2-alexghiti@rivosinc.com>
In-Reply-To: <20240508191931.46060-1-alexghiti@rivosinc.com>
References: <20240508191931.46060-1-alexghiti@rivosinc.com>
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The ARM64_CONTPTE config represents the capability to transparently use
contpte mappings for THP userspace mappings, which will be implemented
in the next commits for riscv, so make this config more generic and move
it to mm.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
---
 arch/arm64/Kconfig               | 9 ---------
 arch/arm64/include/asm/pgtable.h | 6 +++---
 arch/arm64/mm/Makefile           | 2 +-
 mm/Kconfig                       | 9 +++++++++
 4 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index ac2f6d906cc3..9d823015b4e5 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2227,15 +2227,6 @@ config UNWIND_PATCH_PAC_INTO_SCS
 	select UNWIND_TABLES
 	select DYNAMIC_SCS
 
-config ARM64_CONTPTE
-	bool "Contiguous PTE mappings for user memory" if EXPERT
-	depends on TRANSPARENT_HUGEPAGE
-	default y
-	help
-	  When enabled, user mappings are configured using the PTE contiguous
-	  bit, for any mappings that meet the size and alignment requirements.
-	  This reduces TLB pressure and improves performance.
-
 endmenu # "Kernel Features"
 
 menu "Boot options"
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 7c2938cb70b9..1758ce71fae9 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1369,7 +1369,7 @@ extern void ptep_modify_prot_commit(struct vm_area_struct *vma,
 				    unsigned long addr, pte_t *ptep,
 				    pte_t old_pte, pte_t new_pte);
 
-#ifdef CONFIG_ARM64_CONTPTE
+#ifdef CONFIG_THP_CONTPTE
 
 /*
  * The contpte APIs are used to transparently manage the contiguous bit in ptes
@@ -1622,7 +1622,7 @@ static inline int ptep_set_access_flags(struct vm_area_struct *vma,
 	return contpte_ptep_set_access_flags(vma, addr, ptep, entry, dirty);
 }
 
-#else /* CONFIG_ARM64_CONTPTE */
+#else /* CONFIG_THP_CONTPTE */
 
 #define ptep_get				__ptep_get
 #define set_pte					__set_pte
@@ -1642,7 +1642,7 @@ static inline int ptep_set_access_flags(struct vm_area_struct *vma,
 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 #define ptep_set_access_flags			__ptep_set_access_flags
 
-#endif /* CONFIG_ARM64_CONTPTE */
+#endif /* CONFIG_THP_CONTPTE */
 
 int find_num_contig(struct mm_struct *mm, unsigned long addr,
 		    pte_t *ptep, size_t *pgsize);
diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile
index 60454256945b..52a1b2082627 100644
--- a/arch/arm64/mm/Makefile
+++ b/arch/arm64/mm/Makefile
@@ -3,7 +3,7 @@ obj-y				:= dma-mapping.o extable.o fault.o init.o \
 				   cache.o copypage.o flush.o \
 				   ioremap.o mmap.o pgd.o mmu.o \
 				   context.o proc.o pageattr.o fixmap.o
-obj-$(CONFIG_ARM64_CONTPTE)	+= contpte.o
+obj-$(CONFIG_THP_CONTPTE)	+= contpte.o
 obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
 obj-$(CONFIG_PTDUMP_CORE)	+= ptdump.o
 obj-$(CONFIG_PTDUMP_DEBUGFS)	+= ptdump_debugfs.o
diff --git a/mm/Kconfig b/mm/Kconfig
index c325003d6552..fd4de221a1c6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -984,6 +984,15 @@ config ARCH_HAS_CACHE_LINE_SIZE
 config ARCH_HAS_CONTPTE
 	bool
 
+config THP_CONTPTE
+	bool "Contiguous PTE mappings for user memory" if EXPERT
+	depends on ARCH_HAS_CONTPTE && TRANSPARENT_HUGEPAGE
+	default y
+	help
+	  When enabled, user mappings are configured using the PTE contiguous
+	  bit, for any mappings that meet the size and alignment requirements.
+	  This reduces TLB pressure and improves performance.
+
 config ARCH_HAS_CURRENT_STACK_POINTER
 	bool
 	help
-- 
2.39.2