[v6,09/38] arm: Implement the new page table range API

Message ID	20230802151406.3735276-10-willy@infradead.org (mailing list archive)
State	New
Headers	show Return-Path: <owner-linux-mm@kvack.org> From: "Matthew Wilcox (Oracle)" <willy@infradead.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Mike Rapoport <rppt@kernel.org>, Russell King <rmk+kernel@armlinux.org.uk>, linux-arm-kernel@lists.infradead.org Subject: [PATCH v6 09/38] arm: Implement the new page table range API Date: Wed, 2 Aug 2023 16:13:37 +0100 Message-Id: <20230802151406.3735276-10-willy@infradead.org> In-Reply-To: <20230802151406.3735276-1-willy@infradead.org> References: <20230802151406.3735276-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	New page table range API \| expand [v6,00/38] New page table range API [v6,01/38] minmax: Add in_range() macro [v6,02/38] mm: Convert page_table_check_pte_set() to page_table_check_ptes_set() [v6,03/38] mm: Add generic flush_icache_pages() and documentation [v6,04/38] mm: Add folio_flush_mapping() [v6,05/38] mm: Remove ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO [v6,06/38] mm: Add default definition of set_ptes() [v6,07/38] alpha: Implement the new page table range API [v6,08/38] arc: Implement the new page table range API [v6,09/38] arm: Implement the new page table range API [v6,10/38] arm64: Implement the new page table range API [v6,11/38] csky: Implement the new page table range API [v6,12/38] hexagon: Implement the new page table range API [v6,13/38] ia64: Implement the new page table range API [v6,14/38] loongarch: Implement the new page table range API [v6,15/38] m68k: Implement the new page table range API [v6,16/38] microblaze: Implement the new page table range API [v6,17/38] mips: Implement the new page table range API [v6,18/38] nios2: Implement the new page table range API [v6,19/38] openrisc: Implement the new page table range API [v6,20/38] parisc: Implement the new page table range API [v6,21/38] powerpc: Implement the new page table range API [v6,22/38] riscv: Implement the new page table range API [v6,23/38] s390: Implement the new page table range API [v6,24/38] sh: Implement the new page table range API [v6,25/38] sparc32: Implement the new page table range API [v6,26/38] sparc64: Implement the new page table range API [v6,27/38] um: Implement the new page table range API [v6,28/38] x86: Implement the new page table range API [v6,29/38] xtensa: Implement the new page table range API [v6,30/38] mm: Remove page_mapping_file() [v6,31/38] mm: Rationalise flush_icache_pages() and flush_icache_page() [v6,32/38] mm: Tidy up set_ptes definition [v6,33/38] mm: Use flush_icache_pages() in do_set_pmd() [v6,34/38] filemap: Add filemap_map_folio_range() [v6,35/38] rmap: add folio_add_file_rmap_range() [v6,36/38] mm: Convert do_set_pte() to set_pte_range() [v6,37/38] filemap: Batch PTE mappings [v6,38/38] mm: Call update_mmu_cache_range() in more page fault handling paths

diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h index a094f964c869..841e268d2374 100644 --- a/arch/arm/include/asm/cacheflush.h +++ b/arch/arm/include/asm/cacheflush.h @@ -231,14 +231,15 @@ vivt_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned vma->vm_flags); } -static inline void -vivt_flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn) +static inline void vivt_flush_cache_pages(struct vm_area_struct *vma, + unsigned long user_addr, unsigned long pfn, unsigned int nr) { struct mm_struct *mm = vma->vm_mm; if (!mm || cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm))) { unsigned long addr = user_addr & PAGE_MASK; - __cpuc_flush_user_range(addr, addr + PAGE_SIZE, vma->vm_flags); + __cpuc_flush_user_range(addr, addr + nr * PAGE_SIZE, + vma->vm_flags); } } @@ -247,15 +248,17 @@ vivt_flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsig vivt_flush_cache_mm(mm) #define flush_cache_range(vma,start,end) \ vivt_flush_cache_range(vma,start,end) -#define flush_cache_page(vma,addr,pfn) \ - vivt_flush_cache_page(vma,addr,pfn) +#define flush_cache_pages(vma, addr, pfn, nr) \ + vivt_flush_cache_pages(vma, addr, pfn, nr) #else -extern void flush_cache_mm(struct mm_struct *mm); -extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); -extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn); +void flush_cache_mm(struct mm_struct *mm); +void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); +void flush_cache_pages(struct vm_area_struct *vma, unsigned long user_addr, + unsigned long pfn, unsigned int nr); #endif #define flush_cache_dup_mm(mm) flush_cache_mm(mm) +#define flush_cache_page(vma, addr, pfn) flush_cache_pages(vma, addr, pfn, 1) /* * flush_icache_user_range is used when we want to ensure that the @@ -289,7 +292,9 @@ extern void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr * See update_mmu_cache for the user space part. */ #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 -extern void flush_dcache_page(struct page *); +void flush_dcache_page(struct page *); +void flush_dcache_folio(struct folio *folio); +#define flush_dcache_folio flush_dcache_folio #define ARCH_IMPLEMENTS_FLUSH_KERNEL_VMAP_RANGE 1 static inline void flush_kernel_vmap_range(void *addr, int size) @@ -321,6 +326,7 @@ static inline void flush_anon_page(struct vm_area_struct *vma, * duplicate cache flushing elsewhere performed by flush_dcache_page(). */ #define flush_icache_page(vma,page) do { } while (0) +#define flush_icache_pages(vma, page, nr) do { } while (0) /* * flush_cache_vmap() is used when creating mappings (eg, via vmap, diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 34662a9d4cab..ba573f22d7cc 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -207,8 +207,9 @@ static inline void __sync_icache_dcache(pte_t pteval) extern void __sync_icache_dcache(pte_t pteval); #endif -void set_pte_at(struct mm_struct *mm, unsigned long addr, - pte_t *ptep, pte_t pteval); +void set_ptes(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pteval, unsigned int nr); +#define set_ptes set_ptes static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot) { diff --git a/arch/arm/include/asm/tlbflush.h b/arch/arm/include/asm/tlbflush.h index 0ccc985b90af..38c6e4a2a0b6 100644 --- a/arch/arm/include/asm/tlbflush.h +++ b/arch/arm/include/asm/tlbflush.h @@ -619,18 +619,22 @@ extern void flush_bp_all(void); * If PG_dcache_clean is not set for the page, we need to ensure that any * cache entries for the kernels virtual memory range are written * back to the page. On ARMv6 and later, the cache coherency is handled via - * the set_pte_at() function. + * the set_ptes() function. */ #if __LINUX_ARM_ARCH__ < 6 -extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, - pte_t *ptep); +void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr); #else -static inline void update_mmu_cache(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) +static inline void update_mmu_cache_range(struct vm_fault *vmf, + struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, + unsigned int nr) { } #endif +#define update_mmu_cache(vma, addr, ptep) \ + update_mmu_cache_range(NULL, vma, addr, ptep, 1) + #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) #endif diff --git a/arch/arm/mm/copypage-v4mc.c b/arch/arm/mm/copypage-v4mc.c index f1da3b439b96..7ddd82b9fe8b 100644 --- a/arch/arm/mm/copypage-v4mc.c +++ b/arch/arm/mm/copypage-v4mc.c @@ -64,10 +64,11 @@ static void mc_copy_user_page(void *from, void *to) void v4_mc_copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) { + struct folio *src = page_folio(from); void *kto = kmap_atomic(to); - if (!test_and_set_bit(PG_dcache_clean, &from->flags)) - __flush_dcache_page(page_mapping_file(from), from); + if (!test_and_set_bit(PG_dcache_clean, &src->flags)) + __flush_dcache_folio(folio_flush_mapping(src), src); raw_spin_lock(&minicache_lock); diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c index d8a115de5507..a1a71f36d850 100644 --- a/arch/arm/mm/copypage-v6.c +++ b/arch/arm/mm/copypage-v6.c @@ -69,11 +69,12 @@ static void discard_old_kernel_data(void *kto) static void v6_copy_user_highpage_aliasing(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) { + struct folio *src = page_folio(from); unsigned int offset = CACHE_COLOUR(vaddr); unsigned long kfrom, kto; - if (!test_and_set_bit(PG_dcache_clean, &from->flags)) - __flush_dcache_page(page_mapping_file(from), from); + if (!test_and_set_bit(PG_dcache_clean, &src->flags)) + __flush_dcache_folio(folio_flush_mapping(src), src); /* FIXME: not highmem safe */ discard_old_kernel_data(page_address(to)); diff --git a/arch/arm/mm/copypage-xscale.c b/arch/arm/mm/copypage-xscale.c index bcb485620a05..f1e29d3e8193 100644 --- a/arch/arm/mm/copypage-xscale.c +++ b/arch/arm/mm/copypage-xscale.c @@ -84,10 +84,11 @@ static void mc_copy_user_page(void *from, void *to) void xscale_mc_copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) { + struct folio *src = page_folio(from); void *kto = kmap_atomic(to); - if (!test_and_set_bit(PG_dcache_clean, &from->flags)) - __flush_dcache_page(page_mapping_file(from), from); + if (!test_and_set_bit(PG_dcache_clean, &src->flags)) + __flush_dcache_folio(folio_flush_mapping(src), src); raw_spin_lock(&minicache_lock); diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 033a1bce2b17..70cb7e63a9a5 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -695,6 +695,7 @@ static void __dma_page_cpu_to_dev(struct page *page, unsigned long off, static void __dma_page_dev_to_cpu(struct page *page, unsigned long off, size_t size, enum dma_data_direction dir) { + struct folio *folio = page_folio(page); phys_addr_t paddr = page_to_phys(page) + off; /* FIXME: non-speculating: not required */ @@ -709,19 +710,18 @@ static void __dma_page_dev_to_cpu(struct page *page, unsigned long off, * Mark the D-cache clean for these pages to avoid extra flushing. */ if (dir != DMA_TO_DEVICE && size >= PAGE_SIZE) { - unsigned long pfn; - size_t left = size; - - pfn = page_to_pfn(page) + off / PAGE_SIZE; - off %= PAGE_SIZE; - if (off) { - pfn++; - left -= PAGE_SIZE - off; + ssize_t left = size; + size_t offset = offset_in_folio(folio, paddr); + + if (offset) { + left -= folio_size(folio) - offset; + folio = folio_next(folio); } - while (left >= PAGE_SIZE) { - page = pfn_to_page(pfn++); - set_bit(PG_dcache_clean, &page->flags); - left -= PAGE_SIZE; + + while (left >= (ssize_t)folio_size(folio)) { + set_bit(PG_dcache_clean, &folio->flags); + left -= folio_size(folio); + folio = folio_next(folio); } } } diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c index 7cb125497976..2286c2ea60ec 100644 --- a/arch/arm/mm/fault-armv.c +++ b/arch/arm/mm/fault-armv.c @@ -180,12 +180,12 @@ make_coherent(struct address_space *mapping, struct vm_area_struct *vma, * * Note that the pte lock will be held. */ -void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, - pte_t *ptep) +void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr) { unsigned long pfn = pte_pfn(*ptep); struct address_space *mapping; - struct page *page; + struct folio *folio; if (!pfn_valid(pfn)) return; @@ -194,13 +194,13 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, * The zero page is never written to, so never has any dirty * cache lines, and therefore never needs to be flushed. */ - page = pfn_to_page(pfn); - if (page == ZERO_PAGE(0)) + if (is_zero_pfn(pfn)) return; - mapping = page_mapping_file(page); - if (!test_and_set_bit(PG_dcache_clean, &page->flags)) - __flush_dcache_page(mapping, page); + folio = page_folio(pfn_to_page(pfn)); + mapping = folio_flush_mapping(folio); + if (!test_and_set_bit(PG_dcache_clean, &folio->flags)) + __flush_dcache_folio(mapping, folio); if (mapping) { if (cache_is_vivt()) make_coherent(mapping, vma, addr, ptep, pfn); diff --git a/arch/arm/mm/flush.c b/arch/arm/mm/flush.c index 2508be91b7a0..d19d140a10c7 100644 --- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -95,10 +95,10 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned __flush_icache_all(); } -void flush_cache_page(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn) +void flush_cache_pages(struct vm_area_struct *vma, unsigned long user_addr, unsigned long pfn, unsigned int nr) { if (cache_is_vivt()) { - vivt_flush_cache_page(vma, user_addr, pfn); + vivt_flush_cache_pages(vma, user_addr, pfn, nr); return; } @@ -196,29 +196,31 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page, #endif } -void __flush_dcache_page(struct address_space *mapping, struct page *page) +void __flush_dcache_folio(struct address_space *mapping, struct folio *folio) { /* * Writeback any data associated with the kernel mapping of this * page. This ensures that data in the physical page is mutually * coherent with the kernels mapping. */ - if (!PageHighMem(page)) { - __cpuc_flush_dcache_area(page_address(page), page_size(page)); + if (!folio_test_highmem(folio)) { + __cpuc_flush_dcache_area(folio_address(folio), + folio_size(folio)); } else { unsigned long i; if (cache_is_vipt_nonaliasing()) { - for (i = 0; i < compound_nr(page); i++) { - void *addr = kmap_atomic(page + i); + for (i = 0; i < folio_nr_pages(folio); i++) { + void *addr = kmap_local_folio(folio, + i * PAGE_SIZE); __cpuc_flush_dcache_area(addr, PAGE_SIZE); - kunmap_atomic(addr); + kunmap_local(addr); } } else { - for (i = 0; i < compound_nr(page); i++) { - void *addr = kmap_high_get(page + i); + for (i = 0; i < folio_nr_pages(folio); i++) { + void *addr = kmap_high_get(folio_page(folio, i)); if (addr) { __cpuc_flush_dcache_area(addr, PAGE_SIZE); - kunmap_high(page + i); + kunmap_high(folio_page(folio, i)); } } } @@ -230,15 +232,14 @@ void __flush_dcache_page(struct address_space *mapping, struct page *page) * userspace colour, which is congruent with page->index. */ if (mapping && cache_is_vipt_aliasing()) - flush_pfn_alias(page_to_pfn(page), - page->index << PAGE_SHIFT); + flush_pfn_alias(folio_pfn(folio), folio_pos(folio)); } -static void __flush_dcache_aliases(struct address_space *mapping, struct page *page) +static void __flush_dcache_aliases(struct address_space *mapping, struct folio *folio) { struct mm_struct *mm = current->active_mm; - struct vm_area_struct *mpnt; - pgoff_t pgoff; + struct vm_area_struct *vma; + pgoff_t pgoff, pgoff_end; /* * There are possible user space mappings of this page: @@ -246,21 +247,36 @@ static void __flush_dcache_aliases(struct address_space *mapping, struct page *p * data in the current VM view associated with this page. * - aliasing VIPT: we only need to find one mapping of this page. */ - pgoff = page->index; + pgoff = folio->index; + pgoff_end = pgoff + folio_nr_pages(folio) - 1; flush_dcache_mmap_lock(mapping); - vma_interval_tree_foreach(mpnt, &mapping->i_mmap, pgoff, pgoff) { - unsigned long offset; + vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff_end) { + unsigned long start, offset, pfn; + unsigned int nr; /* * If this VMA is not in our MM, we can ignore it. */ - if (mpnt->vm_mm != mm) + if (vma->vm_mm != mm) continue; - if (!(mpnt->vm_flags & VM_MAYSHARE)) + if (!(vma->vm_flags & VM_MAYSHARE)) continue; - offset = (pgoff - mpnt->vm_pgoff) << PAGE_SHIFT; - flush_cache_page(mpnt, mpnt->vm_start + offset, page_to_pfn(page)); + + start = vma->vm_start; + pfn = folio_pfn(folio); + nr = folio_nr_pages(folio); + offset = pgoff - vma->vm_pgoff; + if (offset > -nr) { + pfn -= offset; + nr += offset; + } else { + start += offset * PAGE_SIZE; + } + if (start + nr * PAGE_SIZE > vma->vm_end) + nr = (vma->vm_end - start) / PAGE_SIZE; + + flush_cache_pages(vma, start, pfn, nr); } flush_dcache_mmap_unlock(mapping); } @@ -269,7 +285,7 @@ static void __flush_dcache_aliases(struct address_space *mapping, struct page *p void __sync_icache_dcache(pte_t pteval) { unsigned long pfn; - struct page *page; + struct folio *folio; struct address_space *mapping; if (cache_is_vipt_nonaliasing() && !pte_exec(pteval)) @@ -279,14 +295,14 @@ void __sync_icache_dcache(pte_t pteval) if (!pfn_valid(pfn)) return; - page = pfn_to_page(pfn); + folio = page_folio(pfn_to_page(pfn)); if (cache_is_vipt_aliasing()) - mapping = page_mapping_file(page); + mapping = folio_flush_mapping(folio); else mapping = NULL; - if (!test_and_set_bit(PG_dcache_clean, &page->flags)) - __flush_dcache_page(mapping, page); + if (!test_and_set_bit(PG_dcache_clean, &folio->flags)) + __flush_dcache_folio(mapping, folio); if (pte_exec(pteval)) __flush_icache_all(); @@ -312,7 +328,7 @@ void __sync_icache_dcache(pte_t pteval) * Note that we disable the lazy flush for SMP configurations where * the cache maintenance operations are not automatically broadcasted. */ -void flush_dcache_page(struct page *page) +void flush_dcache_folio(struct folio *folio) { struct address_space *mapping; @@ -320,31 +336,36 @@ void flush_dcache_page(struct page *page) * The zero page is never written to, so never has any dirty * cache lines, and therefore never needs to be flushed. */ - if (page == ZERO_PAGE(0)) + if (is_zero_pfn(folio_pfn(folio))) return; if (!cache_ops_need_broadcast() && cache_is_vipt_nonaliasing()) { - if (test_bit(PG_dcache_clean, &page->flags)) - clear_bit(PG_dcache_clean, &page->flags); + if (test_bit(PG_dcache_clean, &folio->flags)) + clear_bit(PG_dcache_clean, &folio->flags); return; } - mapping = page_mapping_file(page); + mapping = folio_flush_mapping(folio); if (!cache_ops_need_broadcast() && - mapping && !page_mapcount(page)) - clear_bit(PG_dcache_clean, &page->flags); + mapping && !folio_mapped(folio)) + clear_bit(PG_dcache_clean, &folio->flags); else { - __flush_dcache_page(mapping, page); + __flush_dcache_folio(mapping, folio); if (mapping && cache_is_vivt()) - __flush_dcache_aliases(mapping, page); + __flush_dcache_aliases(mapping, folio); else if (mapping) __flush_icache_all(); - set_bit(PG_dcache_clean, &page->flags); + set_bit(PG_dcache_clean, &folio->flags); } } -EXPORT_SYMBOL(flush_dcache_page); +EXPORT_SYMBOL(flush_dcache_folio); +void flush_dcache_page(struct page *page) +{ + flush_dcache_folio(page_folio(page)); +} +EXPORT_SYMBOL(flush_dcache_page); /* * Flush an anonymous page so that users of get_user_pages() * can safely access the data. The expected sequence is: diff --git a/arch/arm/mm/mm.h b/arch/arm/mm/mm.h index d7ffccb7fea7..419316316711 100644 --- a/arch/arm/mm/mm.h +++ b/arch/arm/mm/mm.h @@ -45,7 +45,7 @@ struct mem_type { const struct mem_type *get_mem_type(unsigned int type); -extern void __flush_dcache_page(struct address_space *mapping, struct page *page); +void __flush_dcache_folio(struct address_space *mapping, struct folio *folio); /* * ARM specific vm_struct->flags bits. diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 13fc4bb5f792..c9981c23e8e9 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -1788,7 +1788,7 @@ void __init paging_init(const struct machine_desc *mdesc) bootmem_init(); empty_zero_page = virt_to_page(zero_page); - __flush_dcache_page(NULL, empty_zero_page); + __flush_dcache_folio(NULL, page_folio(empty_zero_page)); } void __init early_mm_init(const struct machine_desc *mdesc) @@ -1797,8 +1797,8 @@ void __init early_mm_init(const struct machine_desc *mdesc) early_paging_init(mdesc); } -void set_pte_at(struct mm_struct *mm, unsigned long addr, - pte_t *ptep, pte_t pteval) +void set_ptes(struct mm_struct *mm, unsigned long addr, + pte_t *ptep, pte_t pteval, unsigned int nr) { unsigned long ext = 0; @@ -1808,5 +1808,11 @@ void set_pte_at(struct mm_struct *mm, unsigned long addr, ext |= PTE_EXT_NG; } - set_pte_ext(ptep, pteval, ext); + for (;;) { + set_pte_ext(ptep, pteval, ext); + if (--nr == 0) + break; + ptep++; + pte_val(pteval) += PAGE_SIZE; + } } diff --git a/arch/arm/mm/nommu.c b/arch/arm/mm/nommu.c index 43cfd06bbeba..c415f3859b20 100644 --- a/arch/arm/mm/nommu.c +++ b/arch/arm/mm/nommu.c @@ -180,6 +180,12 @@ void setup_mm_for_reboot(void) { } +void flush_dcache_folio(struct folio *folio) +{ + __cpuc_flush_dcache_area(folio_address(folio), folio_size(folio)); +} +EXPORT_SYMBOL(flush_dcache_folio); + void flush_dcache_page(struct page *page) { __cpuc_flush_dcache_area(page_address(page), PAGE_SIZE);

[v6,09/38] arm: Implement the new page table range API

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