Merge branch 'akpm'

Quoth Andrew:
  "Random fixes.  And a simple new LED driver which I'm trying to sneak
   in while you're not looking."

Sneaking successful.

* akpm:
  score: fix off-by-one index into syscall table
  mm: fix rss count leakage during migration
  SHM_UNLOCK: fix Unevictable pages stranded after swap
  SHM_UNLOCK: fix long unpreemptible section
  kdump: define KEXEC_NOTE_BYTES arch specific for s390x
  mm/hugetlb.c: undo change to page mapcount in fault handler
  mm: memcg: update the correct soft limit tree during migration
  proc: clear_refs: do not clear reserved pages
  drivers/video/backlight/l4f00242t03.c: return proper error in l4f00242t03_probe if regulator_get() fails
  drivers/video/backlight/adp88x0_bl.c: fix bit testing logic
  kprobes: initialize before using a hlist
  ipc/mqueue: simplify reading msgqueue limit
  leds: add led driver for Bachmann's ot200
  mm: __count_immobile_pages(): make sure the node is online
  mm: fix NULL ptr dereference in __count_immobile_pages
  mm: fix warnings regarding enum migrate_mode

arch/s390/include/asm/kexec.h

@@ -42,6 +42,24 @@
 /* The native architecture */
 #define KEXEC_ARCH KEXEC_ARCH_S390
 
+/*
+ * Size for s390x ELF notes per CPU
+ *
+ * Seven notes plus zero note at the end: prstatus, fpregset, timer,
+ * tod_cmp, tod_reg, control regs, and prefix
+ */
+#define KEXEC_NOTE_BYTES \
+	(ALIGN(sizeof(struct elf_note), 4) * 8 + \
+	 ALIGN(sizeof("CORE"), 4) * 7 + \
+	 ALIGN(sizeof(struct elf_prstatus), 4) + \
+	 ALIGN(sizeof(elf_fpregset_t), 4) + \
+	 ALIGN(sizeof(u64), 4) + \
+	 ALIGN(sizeof(u64), 4) + \
+	 ALIGN(sizeof(u32), 4) + \
+	 ALIGN(sizeof(u64) * 16, 4) + \
+	 ALIGN(sizeof(u32), 4) \
+	)
+
 /* Provide a dummy definition to avoid build failures. */
 static inline void crash_setup_regs(struct pt_regs *newregs,
 					struct pt_regs *oldregs) { }

arch/score/kernel/entry.S

@@ -408,7 +408,7 @@ ENTRY(handle_sys)
 	sw	r9, [r0, PT_EPC]
 
 	cmpi.c	r27, __NR_syscalls 	# check syscall number
-	bgtu	illegal_syscall
+	bgeu	illegal_syscall
 
 	slli	r8, r27, 2		# get syscall routine
 	la	r11, sys_call_table

drivers/leds/Kconfig

@@ -403,6 +403,13 @@ config LEDS_MAX8997
 	  This option enables support for on-chip LED drivers on
 	  MAXIM MAX8997 PMIC.
 
+config LEDS_OT200
+	tristate "LED support for the Bachmann OT200"
+	depends on LEDS_CLASS && HAS_IOMEM
+	help
+	  This option enables support for the LEDs on the Bachmann OT200.
+	  Say Y to enable LEDs on the Bachmann OT200.
+
 config LEDS_TRIGGERS
 	bool "LED Trigger support"
 	depends on LEDS_CLASS

drivers/leds/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_LEDS_LP5523)		+= leds-lp5523.o
 obj-$(CONFIG_LEDS_TCA6507)		+= leds-tca6507.o
 obj-$(CONFIG_LEDS_CLEVO_MAIL)		+= leds-clevo-mail.o
 obj-$(CONFIG_LEDS_HP6XX)		+= leds-hp6xx.o
+obj-$(CONFIG_LEDS_OT200)		+= leds-ot200.o
 obj-$(CONFIG_LEDS_FSG)			+= leds-fsg.o
 obj-$(CONFIG_LEDS_PCA955X)		+= leds-pca955x.o
 obj-$(CONFIG_LEDS_DA903X)		+= leds-da903x.o

drivers/leds/leds-ot200.c

@@ -0,0 +1,171 @@
+/*
+ * Bachmann ot200 leds driver.
+ *
+ * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ *         Christian Gmeiner <christian.gmeiner@gmail.com>
+ *
+ * License: GPL as published by the FSF.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+
+struct ot200_led {
+	struct led_classdev cdev;
+	const char *name;
+	unsigned long port;
+	u8 mask;
+};
+
+/*
+ * The device has three leds on the back panel (led_err, led_init and led_run)
+ * and can handle up to seven leds on the front panel.
+ */
+
+static struct ot200_led leds[] = {
+	{
+		.name = "led_run",
+		.port = 0x5a,
+		.mask = BIT(0),
+	},
+	{
+		.name = "led_init",
+		.port = 0x5a,
+		.mask = BIT(1),
+	},
+	{
+		.name = "led_err",
+		.port = 0x5a,
+		.mask = BIT(2),
+	},
+	{
+		.name = "led_1",
+		.port = 0x49,
+		.mask = BIT(7),
+	},
+	{
+		.name = "led_2",
+		.port = 0x49,
+		.mask = BIT(6),
+	},
+	{
+		.name = "led_3",
+		.port = 0x49,
+		.mask = BIT(5),
+	},
+	{
+		.name = "led_4",
+		.port = 0x49,
+		.mask = BIT(4),
+	},
+	{
+		.name = "led_5",
+		.port = 0x49,
+		.mask = BIT(3),
+	},
+	{
+		.name = "led_6",
+		.port = 0x49,
+		.mask = BIT(2),
+	},
+	{
+		.name = "led_7",
+		.port = 0x49,
+		.mask = BIT(1),
+	}
+};
+
+static DEFINE_SPINLOCK(value_lock);
+
+/*
+ * we need to store the current led states, as it is not
+ * possible to read the current led state via inb().
+ */
+static u8 leds_back;
+static u8 leds_front;
+
+static void ot200_led_brightness_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev);
+	u8 *val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&value_lock, flags);
+
+	if (led->port == 0x49)
+		val = &leds_front;
+	else if (led->port == 0x5a)
+		val = &leds_back;
+	else
+		BUG();
+
+	if (value == LED_OFF)
+		*val &= ~led->mask;
+	else
+		*val |= led->mask;
+
+	outb(*val, led->port);
+	spin_unlock_irqrestore(&value_lock, flags);
+}
+
+static int __devinit ot200_led_probe(struct platform_device *pdev)
+{
+	int i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(leds); i++) {
+
+		leds[i].cdev.name = leds[i].name;
+		leds[i].cdev.brightness_set = ot200_led_brightness_set;
+
+		ret = led_classdev_register(&pdev->dev, &leds[i].cdev);
+		if (ret < 0)
+			goto err;
+	}
+
+	leds_front = 0;		/* turn off all front leds */
+	leds_back = BIT(1);	/* turn on init led */
+	outb(leds_front, 0x49);
+	outb(leds_back, 0x5a);
+
+	return 0;
+
+err:
+	for (i = i - 1; i >= 0; i--)
+		led_classdev_unregister(&leds[i].cdev);
+
+	return ret;
+}
+
+static int __devexit ot200_led_remove(struct platform_device *pdev)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(leds); i++)
+		led_classdev_unregister(&leds[i].cdev);
+
+	return 0;
+}
+
+static struct platform_driver ot200_led_driver = {
+	.probe		= ot200_led_probe,
+	.remove		= __devexit_p(ot200_led_remove),
+	.driver		= {
+		.name	= "leds-ot200",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(ot200_led_driver);
+
+MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@linutronix.de>");
+MODULE_DESCRIPTION("ot200 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-ot200");

drivers/video/backlight/adp8860_bl.c

@@ -146,7 +146,7 @@ static int adp8860_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask
 
 	ret = adp8860_read(client, reg, &reg_val);
 
-	if (!ret && ((reg_val & bit_mask) == 0)) {
+	if (!ret && ((reg_val & bit_mask) != bit_mask)) {
 		reg_val |= bit_mask;
 		ret = adp8860_write(client, reg, reg_val);
 	}

drivers/video/backlight/adp8870_bl.c

@@ -160,7 +160,7 @@ static int adp8870_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask
 
 	ret = adp8870_read(client, reg, &reg_val);
 
-	if (!ret && ((reg_val & bit_mask) == 0)) {
+	if (!ret && ((reg_val & bit_mask) != bit_mask)) {
 		reg_val |= bit_mask;
 		ret = adp8870_write(client, reg, reg_val);
 	}

drivers/video/backlight/l4f00242t03.c

@@ -190,13 +190,15 @@ static int __devinit l4f00242t03_probe(struct spi_device *spi)
 
 	priv->io_reg = regulator_get(&spi->dev, "vdd");
 	if (IS_ERR(priv->io_reg)) {
+		ret = PTR_ERR(priv->io_reg);
 		dev_err(&spi->dev, "%s: Unable to get the IO regulator\n",
 		       __func__);
 		goto err3;
 	}
 
 	priv->core_reg = regulator_get(&spi->dev, "vcore");
 	if (IS_ERR(priv->core_reg)) {
+		ret = PTR_ERR(priv->core_reg);
 		dev_err(&spi->dev, "%s: Unable to get the core regulator\n",
 		       __func__);
 		goto err4;

fs/proc/task_mmu.c

@@ -518,6 +518,9 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
 		if (!page)
 			continue;
 
+		if (PageReserved(page))
+			continue;
+
 		/* Clear accessed and referenced bits. */
 		ptep_test_and_clear_young(vma, addr, pte);
 		ClearPageReferenced(page);

include/linux/fs.h

@@ -10,6 +10,7 @@
 #include <linux/ioctl.h>
 #include <linux/blk_types.h>
 #include <linux/types.h>
+#include <linux/migrate_mode.h>
 
 /*
  * It's silly to have NR_OPEN bigger than NR_FILE, but you can change
@@ -526,7 +527,6 @@ enum positive_aop_returns {
 struct page;
 struct address_space;
 struct writeback_control;
-enum migrate_mode;
 
 struct iov_iter {
 	const struct iovec *iov;

include/linux/kexec.h

@@ -50,9 +50,11 @@
  * note header.  For kdump, the code in vmcore.c runs in the context
  * of the second kernel to combine them into one note.
  */
+#ifndef KEXEC_NOTE_BYTES
 #define KEXEC_NOTE_BYTES ( (KEXEC_NOTE_HEAD_BYTES * 2) +		\
 			    KEXEC_CORE_NOTE_NAME_BYTES +		\
 			    KEXEC_CORE_NOTE_DESC_BYTES )
+#endif
 
 /*
  * This structure is used to hold the arguments that are used when loading

include/linux/migrate.h

@@ -3,22 +3,10 @@
 
 #include <linux/mm.h>
 #include <linux/mempolicy.h>
+#include <linux/migrate_mode.h>
 
 typedef struct page *new_page_t(struct page *, unsigned long private, int **);
 
-/*
- * MIGRATE_ASYNC means never block
- * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
- *	on most operations but not ->writepage as the potential stall time
- *	is too significant
- * MIGRATE_SYNC will block when migrating pages
- */
-enum migrate_mode {
-	MIGRATE_ASYNC,
-	MIGRATE_SYNC_LIGHT,
-	MIGRATE_SYNC,
-};
-
 #ifdef CONFIG_MIGRATION
 #define PAGE_MIGRATION 1
 

include/linux/migrate_mode.h

@@ -0,0 +1,16 @@
+#ifndef MIGRATE_MODE_H_INCLUDED
+#define MIGRATE_MODE_H_INCLUDED
+/*
+ * MIGRATE_ASYNC means never block
+ * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
+ *	on most operations but not ->writepage as the potential stall time
+ *	is too significant
+ * MIGRATE_SYNC will block when migrating pages
+ */
+enum migrate_mode {
+	MIGRATE_ASYNC,
+	MIGRATE_SYNC_LIGHT,
+	MIGRATE_SYNC,
+};
+
+#endif		/* MIGRATE_MODE_H_INCLUDED */

include/linux/shmem_fs.h

@@ -48,6 +48,7 @@ extern struct file *shmem_file_setup(const char *name,
 					loff_t size, unsigned long flags);
 extern int shmem_zero_setup(struct vm_area_struct *);
 extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
+extern void shmem_unlock_mapping(struct address_space *mapping);
 extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
 					pgoff_t index, gfp_t gfp_mask);
 extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);

include/linux/swap.h

@@ -273,7 +273,7 @@ static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
 #endif
 
 extern int page_evictable(struct page *page, struct vm_area_struct *vma);
-extern void scan_mapping_unevictable_pages(struct address_space *);
+extern void check_move_unevictable_pages(struct page **, int nr_pages);
 
 extern unsigned long scan_unevictable_pages;
 extern int scan_unevictable_handler(struct ctl_table *, int,

ipc/mqueue.c

@@ -128,7 +128,6 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
 
 	if (S_ISREG(mode)) {
 		struct mqueue_inode_info *info;
-		struct task_struct *p = current;
 		unsigned long mq_bytes, mq_msg_tblsz;
 
 		inode->i_fop = &mqueue_file_operations;
@@ -159,7 +158,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
 
 		spin_lock(&mq_lock);
 		if (u->mq_bytes + mq_bytes < u->mq_bytes ||
-		    u->mq_bytes + mq_bytes > task_rlimit(p, RLIMIT_MSGQUEUE)) {
+		    u->mq_bytes + mq_bytes > rlimit(RLIMIT_MSGQUEUE)) {
 			spin_unlock(&mq_lock);
 			/* mqueue_evict_inode() releases info->messages */
 			ret = -EMFILE;