Subject: [PATCH V2 33/68] powerpc/mm: Abstraction for vmemmap and map_kernel_page

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Sat, 9 Apr 2016 11:43:29 +0530

Signed-off-by: Aneesh Kumar K.V <[email-masked]>
---
 arch/powerpc/include/asm/book3s/64/hash.h    |  8 ++++++++
 arch/powerpc/include/asm/book3s/64/pgtable.h | 20 ++++++++++++++++++++
 arch/powerpc/include/asm/nohash/64/pgtable.h |  7 +++++++
 arch/powerpc/mm/init_64.c                    |  5 -----
 arch/powerpc/mm/mmu_decl.h                   |  5 -----
 arch/powerpc/mm/pgtable-hash64.c             | 12 ++++++------
 6 files changed, 41 insertions(+), 16 deletions(-)

diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h
index 958491f59c2a..43bd7d15f41e 100644
--- a/arch/powerpc/include/asm/book3s/64/hash.h
+++ b/arch/powerpc/include/asm/book3s/64/hash.h
@@ -197,6 +197,14 @@ static inline void hpte_do_hugepage_flush(struct mm_struct *mm,
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
+
+extern int hlmap_kernel_page(unsigned long ea, unsigned long pa,
+			     unsigned long flags);
+extern int __meminit hlvmemmap_create_mapping(unsigned long start,
+					      unsigned long page_size,
+					      unsigned long phys);
+extern void hlvmemmap_remove_mapping(unsigned long start,
+				     unsigned long page_size);
 #endif /* !__ASSEMBLY__ */
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_H */
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 5bd2ab4fbbc8..623911ed64e9 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -722,6 +722,26 @@ extern struct page *pgd_page(pgd_t pgd);
 void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
 void pgtable_cache_init(void);
 
+static inline int map_kernel_page(unsigned long ea, unsigned long pa,
+				  unsigned long flags)
+{
+	return hlmap_kernel_page(ea, pa, flags);
+}
+
+static inline int __meminit vmemmap_create_mapping(unsigned long start,
+						   unsigned long page_size,
+						   unsigned long phys)
+{
+	return hlvmemmap_create_mapping(start, page_size, phys);
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static inline void vmemmap_remove_mapping(unsigned long start,
+					  unsigned long page_size)
+{
+	return hlvmemmap_remove_mapping(start, page_size);
+}
+#endif
 struct page *realmode_pfn_to_page(unsigned long pfn);
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h
index 10debb93c4a4..f143d6fb3576 100644
--- a/arch/powerpc/include/asm/nohash/64/pgtable.h
+++ b/arch/powerpc/include/asm/nohash/64/pgtable.h
@@ -362,6 +362,13 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry)
 
 void pgtable_cache_add(unsigned shift, void (*ctor)(void *));
 void pgtable_cache_init(void);
+extern int map_kernel_page(unsigned long ea, unsigned long pa,
+			   unsigned long flags);
+extern int __meminit vmemmap_create_mapping(unsigned long start,
+					    unsigned long page_size,
+					    unsigned long phys);
+extern void vmemmap_remove_mapping(unsigned long start,
+				   unsigned long page_size);
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 09ca65e55b58..33709bdb0419 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -240,9 +240,6 @@ static __meminit void vmemmap_list_populate(unsigned long phys,
 	vmemmap_list = vmem_back;
 }
 
-extern int __meminit vmemmap_create_mapping(unsigned long start,
-					    unsigned long page_size,
-					    unsigned long phys);
 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
 {
 	unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
@@ -281,8 +278,6 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG
-extern void vmemmap_remove_mapping(unsigned long start,
-				   unsigned long page_size);
 static unsigned long vmemmap_list_free(unsigned long start)
 {
 	struct vmemmap_backing *vmem_back, *vmem_back_prev;
diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h
index bfb7c0bcabd5..6af65327c993 100644
--- a/arch/powerpc/mm/mmu_decl.h
+++ b/arch/powerpc/mm/mmu_decl.h
@@ -108,11 +108,6 @@ extern unsigned long Hash_size, Hash_mask;
 
 #endif /* CONFIG_PPC32 */
 
-#ifdef CONFIG_PPC64
-extern int map_kernel_page(unsigned long ea, unsigned long pa,
-			   unsigned long flags);
-#endif /* CONFIG_PPC64 */
-
 extern unsigned long ioremap_bot;
 extern unsigned long __max_low_memory;
 extern phys_addr_t __initial_memory_limit_addr;
diff --git a/arch/powerpc/mm/pgtable-hash64.c b/arch/powerpc/mm/pgtable-hash64.c
index 183f80a528ba..b926b0a4ae0c 100644
--- a/arch/powerpc/mm/pgtable-hash64.c
+++ b/arch/powerpc/mm/pgtable-hash64.c
@@ -26,9 +26,9 @@
  * On hash-based CPUs, the vmemmap is bolted in the hash table.
  *
  */
-int __meminit vmemmap_create_mapping(unsigned long start,
-				     unsigned long page_size,
-				     unsigned long phys)
+int __meminit hlvmemmap_create_mapping(unsigned long start,
+				       unsigned long page_size,
+				       unsigned long phys)
 {
 	int rc = htab_bolt_mapping(start, start + page_size, phys,
 				   pgprot_val(PAGE_KERNEL),
@@ -43,8 +43,8 @@ int __meminit vmemmap_create_mapping(unsigned long start,
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG
-void vmemmap_remove_mapping(unsigned long start,
-			    unsigned long page_size)
+void hlvmemmap_remove_mapping(unsigned long start,
+			      unsigned long page_size)
 {
 	int rc = htab_remove_mapping(start, start + page_size,
 				     mmu_vmemmap_psize,
@@ -60,7 +60,7 @@ void vmemmap_remove_mapping(unsigned long start,
  * map_kernel_page adds an entry to the ioremap page table
  * and adds an entry to the HPT, possibly bolting it
  */
-int map_kernel_page(unsigned long ea, unsigned long pa, unsigned long flags)
+int hlmap_kernel_page(unsigned long ea, unsigned long pa, unsigned long flags)
 {
 	pgd_t *pgdp;
 	pud_t *pudp;
-- 
2.5.0