Merge branch 'akpm' (incoming from Andrew)

Merge first batch of fixes from Andrew Morton:

 - A couple of kthread changes

 - A few minor audit patches

 - A number of fbdev patches.  Florian remains AWOL so I'm picking up
   some of these.

 - A few kbuild things

 - ocfs2 updates

 - Almost all of the MM queue

(And in the meantime, I already have the second big batch from Andrew
pending in my mailbox ;^)

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (149 commits)
  memcg: take reference before releasing rcu_read_lock
  mem hotunplug: fix kfree() of bootmem memory
  mmKconfig: add an option to disable bounce
  mm, nobootmem: do memset() after memblock_reserve()
  mm, nobootmem: clean-up of free_low_memory_core_early()
  fs/buffer.c: remove unnecessary init operation after allocating buffer_head.
  numa, cpu hotplug: change links of CPU and node when changing node number by onlining CPU
  mm: fix memory_hotplug.c printk format warning
  mm: swap: mark swap pages writeback before queueing for direct IO
  swap: redirty page if page write fails on swap file
  mm, memcg: give exiting processes access to memory reserves
  thp: fix huge zero page logic for page with pfn == 0
  memcg: avoid accessing memcg after releasing reference
  fs: fix fsync() error reporting
  memblock: fix missing comment of memblock_insert_region()
  mm: Remove unused parameter of pages_correctly_reserved()
  firmware, memmap: fix firmware_map_entry leak
  mm/vmstat: add note on safety of drain_zonestat
  mm: thp: add split tail pages to shrink page list in page reclaim
  mm: allow for outstanding swap writeback accounting
  ...

66 files changed, 371 insertions, 900 deletions

diff --git a/arch/alpha/kernel/sys_nautilus.c b/arch/alpha/kernel/sys_nautilus.c
index 1383f8601a9..1d4aabfcf9a 100644
--- a/arch/alpha/kernel/sys_nautilus.c
+++ b/arch/alpha/kernel/sys_nautilus.c
@@ -185,7 +185,6 @@ nautilus_machine_check(unsigned long vector, unsigned long la_ptr)
 	mb();
 }
 
-extern void free_reserved_mem(void *, void *);
 extern void pcibios_claim_one_bus(struct pci_bus *);
 
 static struct resource irongate_io = {
@@ -239,8 +238,8 @@ nautilus_init_pci(void)
 	if (pci_mem < memtop)
 		memtop = pci_mem;
 	if (memtop > alpha_mv.min_mem_address) {
-		free_reserved_mem(__va(alpha_mv.min_mem_address),
-				  __va(memtop));
+		free_reserved_area((unsigned long)__va(alpha_mv.min_mem_address),
+				   (unsigned long)__va(memtop), 0, NULL);
 		printk("nautilus_init_pci: %ldk freed\n",
 			(memtop - alpha_mv.min_mem_address) >> 10);
 	}
diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
index 1ad6ca74bed..0ba85ee4a46 100644
--- a/arch/alpha/mm/init.c
+++ b/arch/alpha/mm/init.c
@@ -31,6 +31,7 @@
 #include <asm/console.h>
 #include <asm/tlb.h>
 #include <asm/setup.h>
+#include <asm/sections.h>
 
 extern void die_if_kernel(char *,struct pt_regs *,long);
 
@@ -281,8 +282,6 @@ printk_memory_info(void)
 {
 	unsigned long codesize, reservedpages, datasize, initsize, tmp;
 	extern int page_is_ram(unsigned long) __init;
-	extern char _text, _etext, _data, _edata;
-	extern char __init_begin, __init_end;
 
 	/* printk all informations */
 	reservedpages = 0;
@@ -318,32 +317,15 @@ mem_init(void)
 #endif /* CONFIG_DISCONTIGMEM */
 
 void
-free_reserved_mem(void *start, void *end)
-{
-	void *__start = start;
-	for (; __start < end; __start += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(__start));
-		init_page_count(virt_to_page(__start));
-		free_page((long)__start);
-		totalram_pages++;
-	}
-}
-
-void
 free_initmem(void)
 {
-	extern char __init_begin, __init_end;
-
-	free_reserved_mem(&__init_begin, &__init_end);
-	printk ("Freeing unused kernel memory: %ldk freed\n",
-		(&__init_end - &__init_begin) >> 10);
+	free_initmem_default(0);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 void
 free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_reserved_mem((void *)start, (void *)end);
-	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
+	free_reserved_area(start, end, 0, "initrd");
 }
 #endif
diff --git a/arch/alpha/mm/numa.c b/arch/alpha/mm/numa.c
index 3973ae39577..33885048fa3 100644
--- a/arch/alpha/mm/numa.c
+++ b/arch/alpha/mm/numa.c
@@ -17,6 +17,7 @@
 
 #include <asm/hwrpb.h>
 #include <asm/pgalloc.h>
+#include <asm/sections.h>
 
 pg_data_t node_data[MAX_NUMNODES];
 EXPORT_SYMBOL(node_data);
@@ -325,8 +326,6 @@ void __init mem_init(void)
 {
 	unsigned long codesize, reservedpages, datasize, initsize, pfn;
 	extern int page_is_ram(unsigned long) __init;
-	extern char _text, _etext, _data, _edata;
-	extern char __init_begin, __init_end;
 	unsigned long nid, i;
 	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index caf797de23f..727d4794ea0 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -144,37 +144,18 @@ void __init mem_init(void)
 		PAGES_TO_KB(reserved_pages));
 }
 
-static void __init free_init_pages(const char *what, unsigned long begin,
-				   unsigned long end)
-{
-	unsigned long addr;
-
-	pr_info("Freeing %s: %ldk [%lx] to [%lx]\n",
-		what, TO_KB(end - begin), begin, end);
-
-	/* need to check that the page we free is not a partial page */
-	for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(addr));
-		init_page_count(virt_to_page(addr));
-		free_page(addr);
-		totalram_pages++;
-	}
-}
-
 /*
  * free_initmem: Free all the __init memory.
  */
 void __init_refok free_initmem(void)
 {
-	free_init_pages("unused kernel memory",
-			(unsigned long)__init_begin,
-			(unsigned long)__init_end);
+	free_initmem_default(0);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_init_pages("initrd memory", start, end);
+	free_reserved_area(start, end, 0, "initrd");
 }
 #endif
 
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 80d6fc4dbe4..9bcd262a900 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -61,6 +61,15 @@ extern void __pgd_error(const char *file, int line, pgd_t);
 #define FIRST_USER_ADDRESS	PAGE_SIZE
 
 /*
+ * Use TASK_SIZE as the ceiling argument for free_pgtables() and
+ * free_pgd_range() to avoid freeing the modules pmd when LPAE is enabled (pmd
+ * page shared between user and kernel).
+ */
+#ifdef CONFIG_ARM_LPAE
+#define USER_PGTABLES_CEILING	TASK_SIZE
+#endif
+
+/*
  * The pgprot_* and protection_map entries will be fixed up in runtime
  * to include the cachable and bufferable bits based on memory policy,
  * as well as any architecture dependent bits like global/ASID and SMP
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index ad722f1208a..9a5cdc01fcd 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -99,6 +99,9 @@ void show_mem(unsigned int filter)
 	printk("Mem-info:\n");
 	show_free_areas(filter);
 
+	if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
+		return;
+
 	for_each_bank (i, mi) {
 		struct membank *bank = &mi->bank[i];
 		unsigned int pfn1, pfn2;
@@ -424,24 +427,6 @@ void __init bootmem_init(void)
 	max_pfn = max_high - PHYS_PFN_OFFSET;
 }
 
-static inline int free_area(unsigned long pfn, unsigned long end, char *s)
-{
-	unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
-
-	for (; pfn < end; pfn++) {
-		struct page *page = pfn_to_page(pfn);
-		ClearPageReserved(page);
-		init_page_count(page);
-		__free_page(page);
-		pages++;
-	}
-
-	if (size && s)
-		printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
-
-	return pages;
-}
-
 /*
  * Poison init memory with an undefined instruction (ARM) or a branch to an
  * undefined instruction (Thumb).
@@ -534,6 +519,14 @@ static void __init free_unused_memmap(struct meminfo *mi)
 #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
@@ -569,8 +562,7 @@ static void __init free_highpages(void)
 			if (res_end > end)
 				res_end = end;
 			if (res_start != start)
-				totalhigh_pages += free_area(start, res_start,
-							     NULL);
+				free_area_high(start, res_start);
 			start = res_end;
 			if (start == end)
 				break;
@@ -578,9 +570,8 @@ static void __init free_highpages(void)
 
 		/* And now free anything which remains */
 		if (start < end)
-			totalhigh_pages += free_area(start, end, NULL);
+			free_area_high(start, end);
 	}
-	totalram_pages += totalhigh_pages;
 #endif
 }
 
@@ -609,8 +600,7 @@ void __init mem_init(void)
 
 #ifdef CONFIG_SA1111
 	/* now that our DMA memory is actually so designated, we can free it */
-	totalram_pages += free_area(PHYS_PFN_OFFSET,
-				    __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
+	free_reserved_area(__va(PHYS_PFN_OFFSET), swapper_pg_dir, 0, NULL);
 #endif
 
 	free_highpages();
@@ -738,16 +728,12 @@ void free_initmem(void)
 	extern char __tcm_start, __tcm_end;
 
 	poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
-	totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
-				    __phys_to_pfn(__pa(&__tcm_end)),
-				    "TCM link");
+	free_reserved_area(&__tcm_start, &__tcm_end, 0, "TCM link");
 #endif
 
 	poison_init_mem(__init_begin, __init_end - __init_begin);
 	if (!machine_is_integrator() && !machine_is_cintegrator())
-		totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
-					    __phys_to_pfn(__pa(__init_end)),
-					    "init");
+		free_initmem_default(0);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -758,9 +744,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (!keep_initrd) {
 		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
-		totalram_pages += free_area(__phys_to_pfn(__pa(start)),
-					    __phys_to_pfn(__pa(end)),
-					    "initrd");
+		free_reserved_area(start, end, 0, "initrd");
 	}
 }
 
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 800aac306a0..f497ca77925 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -197,24 +197,6 @@ void __init bootmem_init(void)
 	max_pfn = max_low_pfn = max;
 }
 
-static inline int free_area(unsigned long pfn, unsigned long end, char *s)
-{
-	unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
-
-	for (; pfn < end; pfn++) {
-		struct page *page = pfn_to_page(pfn);
-		ClearPageReserved(page);
-		init_page_count(page);
-		__free_page(page);
-		pages++;
-	}
-
-	if (size && s)
-		pr_info("Freeing %s memory: %dK\n", s, size);
-
-	return pages;
-}
-
 /*
  * Poison init memory with an undefined instruction (0x0).
  */
@@ -405,9 +387,7 @@ void __init mem_init(void)
 void free_initmem(void)
 {
 	poison_init_mem(__init_begin, __init_end - __init_begin);
-	totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
-				    __phys_to_pfn(__pa(__init_end)),
-				    "init");
+	free_initmem_default(0);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -418,9 +398,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 {
 	if (!keep_initrd) {
 		poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
-		totalram_pages += free_area(__phys_to_pfn(__pa(start)),
-					    __phys_to_pfn(__pa(end)),
-					    "initrd");
+		free_reserved_area(start, end, 0, "initrd");
 	}
 }
 
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 70b8cd4021c..eeecc9c8ed6 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -391,17 +391,14 @@ int kern_addr_valid(unsigned long addr)
 }
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 #ifdef CONFIG_ARM64_64K_PAGES
-int __meminit vmemmap_populate(struct page *start_page,
-			       unsigned long size, int node)
+int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
 {
-	return vmemmap_populate_basepages(start_page, size, node);
+	return vmemmap_populate_basepages(start, end, node);
 }
 #else	/* !CONFIG_ARM64_64K_PAGES */
-int __meminit vmemmap_populate(struct page *start_page,
-			       unsigned long size, int node)
+int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
 {
-	unsigned long addr = (unsigned long)start_page;
-	unsigned long end = (unsigned long)(start_page + size);
+	unsigned long addr = start;
 	unsigned long next;
 	pgd_t *pgd;
 	pud_t *pud;
@@ -434,7 +431,7 @@ int __meminit vmemmap_populate(struct page *start_page,
 	return 0;
 }
 #endif	/* CONFIG_ARM64_64K_PAGES */
-void vmemmap_free(struct page *memmap, unsigned long nr_pages)
+void vmemmap_free(unsigned long start, unsigned long end)
 {
 }
 #endif	/* CONFIG_SPARSEMEM_VMEMMAP */
diff --git a/arch/avr32/mm/init.c b/arch/avr32/mm/init.c
index 2798c2d4a1c..e66e8406f99 100644
--- a/arch/avr32/mm/init.c
+++ b/arch/avr32/mm/init.c
@@ -146,34 +146,14 @@ void __init mem_init(void)
 		initsize >> 10);
 }
 
-static inline void free_area(unsigned long addr, unsigned long end, char *s)
-{
-	unsigned int size = (end - addr) >> 10;
-
-	for (; addr < end; addr += PAGE_SIZE) {
-		struct page *page = virt_to_page(addr);
-		ClearPageReserved(page);
-		init_page_count(page);
-		free_page(addr);
-		totalram_pages++;
-	}
-
-	if (size && s)
-		printk(KERN_INFO "Freeing %s memory: %dK (%lx - %lx)\n",
-		       s, size, end - (size << 10), end);
-}
-
 void free_initmem(void)
 {
-	free_area((unsigned long)__init_begin, (unsigned long)__init_end,
-		  "init");
+	free_initmem_default(0);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
-
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
-	free_area(start, end, "initrd");
+	free_reserved_area(start, end, 0, "initrd");
 }
-
 #endif
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
index 9cb85537bd2..82d01a71207 100644
--- a/arch/blackfin/mm/init.c
+++ b/arch/blackfin/mm/init.c
@@ -103,7 +103,7 @@ void __init mem_init(void)
 	max_mapnr = num_physpages = MAP_NR(high_memory);
 	printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);
 
-	/* This will put all memory onto the freelists. */
+	/* This will put all low memory onto the freelists. */
 	totalram_pages = free_all_bootmem();
 
 	reservedpages = 0;
@@ -129,24 +129,11 @@ void __init mem_init(void)
 		initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10)));
 }
 
-static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end)
-{
-	unsigned long addr;
-	/* next to check that the page we free is not a partial page */
-	for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(addr));
-		init_page_count(virt_to_page(addr));
-		free_page(addr);
-		totalram_pages++;
-	}
-	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
-}
-
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
 #ifndef CONFIG_MPU
-	free_init_pages("initrd memory", start, end);
+	free_reserved_area(start, end, 0, "initrd");
 #endif
 }
 #endif
@@ -154,10 +141,7 @@ void __init free_initrd_mem(unsigned long start, unsigned long end)
 void __init_refok free_initmem(void)
 {
 #if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
-	free_init_pages("unused kernel memory",
-			(unsigned long)(&__init_begin),
-			(unsigned long)(&__init_end));
-
+	free_initmem_default(0);
 	if (memory_start == (unsigned long)(&__init_end))
 		memory_start = (unsigned long)(&__init_begin);
 #endif
diff --git a/arch/c6x/mm/init.c b/arch/c6x/mm/init.c
index 89395f09648..a9fcd89b251 100644
--- a/arch/c6x/mm/init.c
+++ b/arch/c6x/mm/init.c
@@ -77,37 +77,11 @@ void __init mem_init(void)
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-	int pages = 0;
-	for (; start < end; start += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(start));
-		init_page_count(virt_to_page(start));
-		free_page(start);
-		totalram_pages++;
-		pages++;
-	}
-	printk(KERN_INFO "Freeing initrd memory: %luk freed\n",
-	       (pages * PAGE_SIZE) >> 10);
+	free_reserved_area(start, end, 0, "initrd");
 }
 #endif
 
 void __init free_initmem(void)
 {
-	unsigned long addr;
-
-	/*
-	 * The following code should be cool even if these sections
-	 * are not page aligned.
-	 */
-	addr = PAGE_ALIGN((unsigned long)(__init_begin));
-
-	/* next to check that the page we free is not a partial page */
-	for (; addr + PAGE_SIZE < (unsigned long)(__init_end);
-	     addr += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(addr));
-		init_page_count(virt_to_page(addr));
-		free_page(addr);
-		totalram_pages++;
-	}
-	printk(KERN_INFO "Freeing unused kernel memory: %dK freed\n",
-	       (int) ((addr - PAGE_ALIGN((long) &__init_begin)) >> 10));
+	free_initmem_default(0);
 }
diff --git a/arch/cris/mm/init.c b/arch/cris/mm/init.c
index d72ab58fd83..9ac80946dad 100644
--- a/arch/cris/mm/init.c
+++ b/arch/cris/mm/init.c
@@ -12,12 +12,10 @@
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <asm/tlb.h>
+#include <asm/sections.h>
 
 unsigned long empty_zero_page;
 
-extern char _stext, _edata, _etext; /* From linkerscript */
-extern char __init_begin, __init_end;
-
 void __init
 mem_init(void)
 {
@@ -67,15 +65,5 @@ mem_init(void)
 void 
 free_initmem(void)
 {
-        unsigned long addr;
-
-        addr = (unsigned long)(&__init_begin);
-        for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
-                ClearPageReserved(virt_to_page(addr));
-                init_page_count(virt_to_page(addr));
-                free_page(addr);
-                totalram_pages++;
-        }
-        printk (KERN_INFO "Freeing unused kernel memory: %luk freed\n",
-		(unsigned long)((&__init_end - &__init_begin) >> 10));
+	free_initmem_default(0);
 }
diff --git a/arch/frv/mm/init.c b/arch/frv/mm/init.c<