Merge branch 'akpm' (patches from Andrew)

Merge misc updates from Andrew Morton:
 "181 patches.

  Subsystems affected by this patch series: kbuild, scripts, ntfs,
  ocfs2, vfs, mm (slab, slub, kmemleak, dax, debug, pagecache, fadvise,
  gup, swap, memremap, memcg, selftests, pagemap, mincore, hmm, dma,
  memory-failure, vmallo and migration)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (181 commits)
  mm/migrate: remove obsolete comment about device public
  mm/migrate: remove cpages-- in migrate_vma_finalize()
  mm, oom_adj: don't loop through tasks in __set_oom_adj when not necessary
  memblock: use separate iterators for memory and reserved regions
  memblock: implement for_each_reserved_mem_region() using __next_mem_region()
  memblock: remove unused memblock_mem_size()
  x86/setup: simplify reserve_crashkernel()
  x86/setup: simplify initrd relocation and reservation
  arch, drivers: replace for_each_membock() with for_each_mem_range()
  arch, mm: replace for_each_memblock() with for_each_mem_pfn_range()
  memblock: reduce number of parameters in for_each_mem_range()
  memblock: make memblock_debug and related functionality private
  memblock: make for_each_memblock_type() iterator private
  mircoblaze: drop unneeded NUMA and sparsemem initializations
  riscv: drop unneeded node initialization
  h8300, nds32, openrisc: simplify detection of memory extents
  arm64: numa: simplify dummy_numa_init()
  arm, xtensa: simplify initialization of high memory pages
  dma-contiguous: simplify cma_early_percent_memory()
  KVM: PPC: Book3S HV: simplify kvm_cma_reserve()
  ...

8 files changed, 62 insertions, 104 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 82d0b00bc7a5..3996b6572c3a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -85,7 +85,7 @@ config ARM
 	select HAVE_FAST_GUP if ARM_LPAE
 	select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
 	select HAVE_FUNCTION_GRAPH_TRACER if !THUMB2_KERNEL && !CC_IS_CLANG
-	select HAVE_FUNCTION_TRACER if !XIP_KERNEL && (CC_IS_GCC || CLANG_VERSION >= 100000)
+	select HAVE_FUNCTION_TRACER if !XIP_KERNEL
 	select HAVE_GCC_PLUGINS
 	select HAVE_HW_BREAKPOINT if PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7)
 	select HAVE_IDE if PCI || ISA || PCMCIA
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
index 9415222b49ad..b8cbe03ad260 100644
--- a/arch/arm/include/asm/tlb.h
+++ b/arch/arm/include/asm/tlb.h
@@ -59,6 +59,7 @@ __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
 #ifdef CONFIG_ARM_LPAE
 	struct page *page = virt_to_page(pmdp);
 
+	pgtable_pmd_page_dtor(page);
 	tlb_remove_table(tlb, page);
 #endif
 }
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index d8e18cdd96d3..3f65d0ac9f63 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -843,20 +843,26 @@ early_param("mem", early_mem);
 
 static void __init request_standard_resources(const struct machine_desc *mdesc)
 {
-	struct memblock_region *region;
+	phys_addr_t start, end, res_end;
 	struct resource *res;
+	u64 i;
 
 	kernel_code.start   = virt_to_phys(_text);
 	kernel_code.end     = virt_to_phys(__init_begin - 1);
 	kernel_data.start   = virt_to_phys(_sdata);
 	kernel_data.end     = virt_to_phys(_end - 1);
 
-	for_each_memblock(memory, region) {
-		phys_addr_t start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
-		phys_addr_t end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
+	for_each_mem_range(i, &start, &end) {
 		unsigned long boot_alias_start;
 
 		/*
+		 * In memblock, end points to the first byte after the
+		 * range while in resourses, end points to the last byte in
+		 * the range.
+		 */
+		res_end = end - 1;
+
+		/*
 		 * Some systems have a special memory alias which is only
 		 * used for booting.  We need to advertise this region to
 		 * kexec-tools so they know where bootable RAM is located.
@@ -869,7 +875,7 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 				      __func__, sizeof(*res));
 			res->name = "System RAM (boot alias)";
 			res->start = boot_alias_start;
-			res->end = phys_to_idmap(end);
+			res->end = phys_to_idmap(res_end);
 			res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 			request_resource(&iomem_resource, res);
 		}
@@ -880,7 +886,7 @@ static void __init request_standard_resources(const struct machine_desc *mdesc)
 			      sizeof(*res));
 		res->name  = "System RAM";
 		res->start = start;
-		res->end = end;
+		res->end = res_end;
 		res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 
 		request_resource(&iomem_resource, res);
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 000c1b48e973..45f9d5ec2360 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -299,16 +299,14 @@ free_memmap(unsigned long start_pfn, unsigned long end_pfn)
  */
 static void __init free_unused_memmap(void)
 {
-	unsigned long start, prev_end = 0;
-	struct memblock_region *reg;
+	unsigned long start, end, prev_end = 0;
+	int i;
 
 	/*
 	 * This relies on each bank being in address order.
 	 * The banks are sorted previously in bootmem_init().
 	 */
-	for_each_memblock(memory, reg) {
-		start = memblock_region_memory_base_pfn(reg);
-
+	for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
 #ifdef CONFIG_SPARSEMEM
 		/*
 		 * Take care not to free memmap entries that don't exist
@@ -336,8 +334,7 @@ static void __init free_unused_memmap(void)
 		 * memmap entries are valid from the bank end aligned to
 		 * MAX_ORDER_NR_PAGES.
 		 */
-		prev_end = ALIGN(memblock_region_memory_end_pfn(reg),
-				 MAX_ORDER_NR_PAGES);
+		prev_end = ALIGN(end, MAX_ORDER_NR_PAGES);
 	}
 
 #ifdef CONFIG_SPARSEMEM
@@ -347,61 +344,29 @@ static void __init free_unused_memmap(void)
 #endif
 }
 
-#ifdef CONFIG_HIGHMEM
-static inline void free_area_high(unsigned long pfn, unsigned long end)
-{
-	for (; pfn < end; pfn++)
-		free_highmem_page(pfn_to_page(pfn));
-}
-#endif
-
 static void __init free_highpages(void)
 {
 #ifdef CONFIG_HIGHMEM
 	unsigned long max_low = max_low_pfn;
-	struct memblock_region *mem, *res;
+	phys_addr_t range_start, range_end;
+	u64 i;
 
 	/* set highmem page free */
-	for_each_memblock(memory, mem) {
-		unsigned long start = memblock_region_memory_base_pfn(mem);
-		unsigned long end = memblock_region_memory_end_pfn(mem);
+	for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
+				&range_start, &range_end, NULL) {
+		unsigned long start = PHYS_PFN(range_start);
+		unsigned long end = PHYS_PFN(range_end);
 
 		/* Ignore complete lowmem entries */
 		if (end <= max_low)
 			continue;
 
-		if (memblock_is_nomap(mem))
-			continue;
-
 		/* Truncate partial highmem entries */
 		if (start < max_low)
 			start = max_low;
 
-		/* Find and exclude any reserved regions */
-		for_each_memblock(reserved, res) {
-			unsigned long res_start, res_end;
-
-			res_start = memblock_region_reserved_base_pfn(res);
-			res_end = memblock_region_reserved_end_pfn(res);
-
-			if (res_end < start)
-				continue;
-			if (res_start < start)
-				res_start = start;
-			if (res_start > end)
-				res_start = end;
-			if (res_end > end)
-				res_end = end;
-			if (res_start != start)
-				free_area_high(start, res_start);
-			start = res_end;
-			if (start == end)
-				break;
-		}
-
-		/* And now free anything which remains */
-		if (start < end)
-			free_area_high(start, end);
+		for (; start < end; start++)
+			free_highmem_page(pfn_to_page(start));
 	}
 #endif
 }
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index c36f977b2ccb..698cc740c6b8 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1154,9 +1154,8 @@ phys_addr_t arm_lowmem_limit __initdata = 0;
 
 void __init adjust_lowmem_bounds(void)
 {
-	phys_addr_t memblock_limit = 0;
-	u64 vmalloc_limit;
-	struct memblock_region *reg;
+	phys_addr_t block_start, block_end, memblock_limit = 0;
+	u64 vmalloc_limit, i;
 	phys_addr_t lowmem_limit = 0;
 
 	/*
@@ -1172,26 +1171,18 @@ void __init adjust_lowmem_bounds(void)
 	 * The first usable region must be PMD aligned. Mark its start
 	 * as MEMBLOCK_NOMAP if it isn't
 	 */
-	for_each_memblock(memory, reg) {
-		if (!memblock_is_nomap(reg)) {
-			if (!IS_ALIGNED(reg->base, PMD_SIZE)) {
-				phys_addr_t len;
+	for_each_mem_range(i, &block_start, &block_end) {
+		if (!IS_ALIGNED(block_start, PMD_SIZE)) {
+			phys_addr_t len;
 
-				len = round_up(reg->base, PMD_SIZE) - reg->base;
-				memblock_mark_nomap(reg->base, len);
-			}
-			break;
+			len = round_up(block_start, PMD_SIZE) - block_start;
+			memblock_mark_nomap(block_start, len);
 		}
+		break;
 	}
 
-	for_each_memblock(memory, reg) {
-		phys_addr_t block_start = reg->base;
-		phys_addr_t block_end = reg->base + reg->size;
-
-		if (memblock_is_nomap(reg))
-			continue;
-
-		if (reg->base < vmalloc_limit) {
+	for_each_mem_range(i, &block_start, &block_end) {
+		if (block_start < vmalloc_limit) {
 			if (block_end > lowmem_limit)
 				/*
 				 * Compare as u64 to ensure vmalloc_limit does
@@ -1440,19 +1431,15 @@ static void __init kmap_init(void)
 
 static void __init map_lowmem(void)
 {
-	struct memblock_region *reg;
 	phys_addr_t kernel_x_start = round_down(__pa(KERNEL_START), SECTION_SIZE);
 	phys_addr_t kernel_x_end = round_up(__pa(__init_end), SECTION_SIZE);
+	phys_addr_t start, end;
+	u64 i;
 
 	/* Map all the lowmem memory banks. */
-	for_each_memblock(memory, reg) {
-		phys_addr_t start = reg->base;
-		phys_addr_t end = start + reg->size;
+	for_each_mem_range(i, &start, &end) {
 		struct map_desc map;
 
-		if (memblock_is_nomap(reg))
-			continue;
-
 		if (end > arm_lowmem_limit)
 			end = arm_lowmem_limit;
 		if (start >= end)
diff --git a/arch/arm/mm/pmsa-v7.c b/arch/arm/mm/pmsa-v7.c
index 699fa2e88725..88950e41a3a9 100644
--- a/arch/arm/mm/pmsa-v7.c
+++ b/arch/arm/mm/pmsa-v7.c
@@ -231,12 +231,12 @@ static int __init allocate_region(phys_addr_t base, phys_addr_t size,
 void __init pmsav7_adjust_lowmem_bounds(void)
 {
 	phys_addr_t  specified_mem_size = 0, total_mem_size = 0;
-	struct memblock_region *reg;
-	bool first = true;
 	phys_addr_t mem_start;
 	phys_addr_t mem_end;
+	phys_addr_t reg_start, reg_end;
 	unsigned int mem_max_regions;
-	int num, i;
+	int num;
+	u64 i;
 
 	/* Free-up PMSAv7_PROBE_REGION */
 	mpu_min_region_order = __mpu_min_region_order();
@@ -262,20 +262,19 @@ void __init pmsav7_adjust_lowmem_bounds(void)
 	mem_max_regions -= num;
 #endif
 
-	for_each_memblock(memory, reg) {
-		if (first) {
+	for_each_mem_range(i, &reg_start, &reg_end) {
+		if (i == 0) {
 			phys_addr_t phys_offset = PHYS_OFFSET;
 
 			/*
 			 * Initially only use memory continuous from
 			 * PHYS_OFFSET */
-			if (reg->base != phys_offset)
+			if (reg_start != phys_offset)
 				panic("First memory bank must be contiguous from PHYS_OFFSET");
 
-			mem_start = reg->base;
-			mem_end = reg->base + reg->size;
-			specified_mem_size = reg->size;
-			first = false;
+			mem_start = reg_start;
+			mem_end = reg_end;
+			specified_mem_size = mem_end - mem_start;
 		} else {
 			/*
 			 * memblock auto merges contiguous blocks, remove
@@ -283,8 +282,8 @@ void __init pmsav7_adjust_lowmem_bounds(void)
 			 * blocks separately while iterating)
 			 */
 			pr_notice("Ignoring RAM after %pa, memory at %pa ignored\n",
-				  &mem_end, &reg->base);
-			memblock_remove(reg->base, 0 - reg->base);
+				  &mem_end, &reg_start);
+			memblock_remove(reg_start, 0 - reg_start);
 			break;
 		}
 	}
diff --git a/arch/arm/mm/pmsa-v8.c b/arch/arm/mm/pmsa-v8.c
index 0d7d5fb59247..2de019f7503e 100644
--- a/arch/arm/mm/pmsa-v8.c
+++ b/arch/arm/mm/pmsa-v8.c
@@ -94,20 +94,19 @@ static __init bool is_region_fixed(int number)
 void __init pmsav8_adjust_lowmem_bounds(void)
 {
 	phys_addr_t mem_end;
-	struct memblock_region *reg;
-	bool first = true;
+	phys_addr_t reg_start, reg_end;
+	u64 i;
 
-	for_each_memblock(memory, reg) {
-		if (first) {
+	for_each_mem_range(i, &reg_start, &reg_end) {
+		if (i == 0) {
 			phys_addr_t phys_offset = PHYS_OFFSET;
 
 			/*
 			 * Initially only use memory continuous from
 			 * PHYS_OFFSET */
-			if (reg->base != phys_offset)
+			if (reg_start != phys_offset)
 				panic("First memory bank must be contiguous from PHYS_OFFSET");
-			mem_end = reg->base + reg->size;
-			first = false;
+			mem_end = reg_end;
 		} else {
 			/*
 			 * memblock auto merges contiguous blocks, remove
@@ -115,8 +114,8 @@ void __init pmsav8_adjust_lowmem_bounds(void)
 			 * blocks separately while iterating)
 			 */
 			pr_notice("Ignoring RAM after %pa, memory at %pa ignored\n",
-				  &mem_end, &reg->base);
-			memblock_remove(reg->base, 0 - reg->base);
+				  &mem_end, &reg_start);
+			memblock_remove(reg_start, 0 - reg_start);
 			break;
 		}
 	}
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 396797ffe2b1..d3ef975a0965 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -25,11 +25,12 @@
 
 unsigned long xen_get_swiotlb_free_pages(unsigned int order)
 {
-	struct memblock_region *reg;
+	phys_addr_t base;
 	gfp_t flags = __GFP_NOWARN|__GFP_KSWAPD_RECLAIM;
+	u64 i;
 
-	for_each_memblock(memory, reg) {
-		if (reg->base < (phys_addr_t)0xffffffff) {
+	for_each_mem_range(i, &base, NULL) {
+		if (base < (phys_addr_t)0xffffffff) {
 			if (IS_ENABLED(CONFIG_ZONE_DMA32))
 				flags |= __GFP_DMA32;
 			else