Merge branch 'akpm' (patches from Andrew Morton)

Merge second patch-bomb from Andrew Morton:
 - a few hotfixes
 - drivers/dma updates
 - MAINTAINERS updates
 - Quite a lot of lib/ updates
 - checkpatch updates
 - binfmt updates
 - autofs4
 - drivers/rtc/
 - various small tweaks to less used filesystems
 - ipc/ updates
 - kernel/watchdog.c changes

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (135 commits)
  mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared
  kernel/param: consolidate __{start,stop}___param[] in <linux/moduleparam.h>
  ia64: remove duplicate declarations of __per_cpu_start[] and __per_cpu_end[]
  frv: remove unused declarations of __start___ex_table and __stop___ex_table
  kvm: ensure hard lockup detection is disabled by default
  kernel/watchdog.c: control hard lockup detection default
  staging: rtl8192u: use %*pEn to escape buffer
  staging: rtl8192e: use %*pEn to escape buffer
  staging: wlan-ng: use %*pEhp to print SN
  lib80211: remove unused print_ssid()
  wireless: hostap: proc: print properly escaped SSID
  wireless: ipw2x00: print SSID via %*pE
  wireless: libertas: print esaped string via %*pE
  lib/vsprintf: add %*pE[achnops] format specifier
  lib / string_helpers: introduce string_escape_mem()
  lib / string_helpers: refactoring the test suite
  lib / string_helpers: move documentation to c-file
  include/linux: remove strict_strto* definitions
  arch/x86/mm/numa.c: fix boot failure when all nodes are hotpluggable
  fs: check bh blocknr earlier when searching lru
  ...

7 files changed, 108 insertions, 48 deletions

diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
index 70a504601dc3..b20d544f20c2 100644
--- a/kernel/debug/kdb/kdb_bp.c
+++ b/kernel/debug/kdb/kdb_bp.c
@@ -52,11 +52,11 @@ static int kdb_parsebp(int argc, const char **argv, int *nextargp, kdb_bp_t *bp)
 
         bp->bph_length = 1;
         if ((argc + 1) != nextarg) {
-                if (strnicmp(argv[nextarg], "datar", sizeof("datar")) == 0)
+                if (strncasecmp(argv[nextarg], "datar", sizeof("datar")) == 0)
                         bp->bp_type = BP_ACCESS_WATCHPOINT;
-                else if (strnicmp(argv[nextarg], "dataw", sizeof("dataw")) == 0)
+                else if (strncasecmp(argv[nextarg], "dataw", sizeof("dataw")) == 0)
                         bp->bp_type = BP_WRITE_WATCHPOINT;
-                else if (strnicmp(argv[nextarg], "inst", sizeof("inst")) == 0)
+                else if (strncasecmp(argv[nextarg], "inst", sizeof("inst")) == 0)
                         bp->bp_type = BP_HARDWARE_BREAKPOINT;
                 else
                         return KDB_ARGCOUNT;
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index ae5167087845..5c5987f10819 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -565,19 +565,12 @@ static int kallsyms_open(struct inode *inode, struct file *file)
          * using get_symbol_offset for every symbol.
          */
         struct kallsym_iter *iter;
-        int ret;
-
-        iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+        iter = __seq_open_private(file, &kallsyms_op, sizeof(*iter));
         if (!iter)
                 return -ENOMEM;
         reset_iter(iter, 0);
 
-        ret = seq_open(file, &kallsyms_op);
-        if (ret == 0)
-                ((struct seq_file *)file->private_data)->private = iter;
-        else
-                kfree(iter);
-        return ret;
+        return 0;
 }
 
 #ifdef  CONFIG_KGDB_KDB
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 2bee072268d9..2abf9f6e9a61 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1759,7 +1759,6 @@ static __initdata char *suffix_tbl[] = {
  */
 static int __init parse_crashkernel_suffix(char *cmdline,
                                            unsigned long long   *crash_size,
-                                           unsigned long long   *crash_base,
                                            const char *suffix)
 {
         char *cur = cmdline;
@@ -1848,7 +1847,7 @@ static int __init __parse_crashkernel(char *cmdline,
 
         if (suffix)
                 return parse_crashkernel_suffix(ck_cmdline, crash_size,
-                                crash_base, suffix);
+                                suffix);
         /*
          * if the commandline contains a ':', then that's the extended
          * syntax -- if not, it must be the classic syntax
@@ -2016,22 +2015,6 @@ static int __init crash_save_vmcoreinfo_init(void)
 subsys_initcall(crash_save_vmcoreinfo_init);
 
 #ifdef CONFIG_KEXEC_FILE
-static int __kexec_add_segment(struct kimage *image, char *buf,
-                               unsigned long bufsz, unsigned long mem,
-                               unsigned long memsz)
-{
-        struct kexec_segment *ksegment;
-
-        ksegment = &image->segment[image->nr_segments];
-        ksegment->kbuf = buf;
-        ksegment->bufsz = bufsz;
-        ksegment->mem = mem;
-        ksegment->memsz = memsz;
-        image->nr_segments++;
-
-        return 0;
-}
-
 static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
                                     struct kexec_buf *kbuf)
 {
@@ -2064,8 +2047,7 @@ static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
         } while (1);
 
         /* If we are here, we found a suitable memory range */
-        __kexec_add_segment(image, kbuf->buffer, kbuf->bufsz, temp_start,
-                            kbuf->memsz);
+        kbuf->mem = temp_start;
 
         /* Success, stop navigating through remaining System RAM ranges */
         return 1;
@@ -2099,8 +2081,7 @@ static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end,
         } while (1);
 
         /* If we are here, we found a suitable memory range */
-        __kexec_add_segment(image, kbuf->buffer, kbuf->bufsz, temp_start,
-                            kbuf->memsz);
+        kbuf->mem = temp_start;
 
         /* Success, stop navigating through remaining System RAM ranges */
         return 1;
@@ -2187,7 +2168,12 @@ int kexec_add_buffer(struct kimage *image, char *buffer, unsigned long bufsz,
         }
 
         /* Found a suitable memory range */
-        ksegment = &image->segment[image->nr_segments - 1];
+        ksegment = &image->segment[image->nr_segments];
+        ksegment->kbuf = kbuf->buffer;
+        ksegment->bufsz = kbuf->bufsz;
+        ksegment->mem = kbuf->mem;
+        ksegment->memsz = kbuf->memsz;
+        image->nr_segments++;
         *load_addr = ksegment->mem;
         return 0;
 }
diff --git a/kernel/params.c b/kernel/params.c
index 041b5899d5e2..db97b791390f 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -19,6 +19,7 @@
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/module.h>
+#include <linux/moduleparam.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/slab.h>
@@ -513,8 +514,6 @@ EXPORT_SYMBOL(param_ops_string);
 #define to_module_attr(n) container_of(n, struct module_attribute, attr)
 #define to_module_kobject(n) container_of(n, struct module_kobject, kobj)
 
-extern struct kernel_param __start___param[], __stop___param[];
-
 struct param_attribute
 {
         struct module_attribute mattr;
@@ -774,7 +773,7 @@ static struct module_kobject * __init locate_module_kobject(const char *name)
 }
 
 static void __init kernel_add_sysfs_param(const char *name,
-                                          struct kernel_param *kparam,
+                                          const struct kernel_param *kparam,
                                           unsigned int name_skip)
 {
         struct module_kobject *mk;
@@ -809,7 +808,7 @@ static void __init kernel_add_sysfs_param(const char *name,
  */
 static void __init param_sysfs_builtin(void)
 {
-        struct kernel_param *kp;
+        const struct kernel_param *kp;
         unsigned int name_len;
         char modname[MODULE_NAME_LEN];
 
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 7a6e69441f75..e3962d63e368 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -267,7 +267,6 @@ static u32 clear_idx;
 #define LOG_ALIGN __alignof__(struct printk_log)
 #endif
 #define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
-#define __LOG_CPU_MAX_BUF_LEN (1 << CONFIG_LOG_CPU_MAX_BUF_SHIFT)
 static char __log_buf[__LOG_BUF_LEN] __aligned(LOG_ALIGN);
 static char *log_buf = __log_buf;
 static u32 log_buf_len = __LOG_BUF_LEN;
@@ -852,6 +851,9 @@ static int __init log_buf_len_setup(char *str)
 }
 early_param("log_buf_len", log_buf_len_setup);
 
+#ifdef CONFIG_SMP
+#define __LOG_CPU_MAX_BUF_LEN (1 << CONFIG_LOG_CPU_MAX_BUF_SHIFT)
+
 static void __init log_buf_add_cpu(void)
 {
         unsigned int cpu_extra;
@@ -878,6 +880,9 @@ static void __init log_buf_add_cpu(void)
 
         log_buf_len_update(cpu_extra + __LOG_BUF_LEN);
 }
+#else /* !CONFIG_SMP */
+static inline void log_buf_add_cpu(void) {}
+#endif /* CONFIG_SMP */
 
 void __init setup_log_buf(int early)
 {
@@ -1674,12 +1679,7 @@ asmlinkage int vprintk_emit(int facility, int level,
          * The printf needs to come first; we need the syslog
          * prefix which might be passed-in as a parameter.
          */
-        if (in_sched)
-                text_len = scnprintf(text, sizeof(textbuf),
-                                     KERN_WARNING "[sched_delayed] ");
-
-        text_len += vscnprintf(text + text_len,
-                               sizeof(textbuf) - text_len, fmt, args);
+        text_len = vscnprintf(text, sizeof(textbuf), fmt, args);
 
         /* mark and strip a trailing newline */
         if (text_len && text[text_len-1] == '\n') {
diff --git a/kernel/resource.c b/kernel/resource.c
index 46322019ab7d..0bcebffc4e77 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -491,6 +491,42 @@ int __weak page_is_ram(unsigned long pfn)
 }
 EXPORT_SYMBOL_GPL(page_is_ram);
 
+/*
+ * Search for a resouce entry that fully contains the specified region.
+ * If found, return 1 if it is RAM, 0 if not.
+ * If not found, or region is not fully contained, return -1
+ *
+ * Used by the ioremap functions to ensure the user is not remapping RAM and is
+ * a vast speed up over walking through the resource table page by page.
+ */
+int region_is_ram(resource_size_t start, unsigned long size)
+{
+        struct resource *p;
+        resource_size_t end = start + size - 1;
+        int flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+        const char *name = "System RAM";
+        int ret = -1;
+
+        read_lock(&resource_lock);
+        for (p = iomem_resource.child; p ; p = p->sibling) {
+                if (end < p->start)
+                        continue;
+
+                if (p->start <= start && end <= p->end) {
+                        /* resource fully contains region */
+                        if ((p->flags != flags) || strcmp(p->name, name))
+                                ret = 0;
+                        else
+                                ret = 1;
+                        break;
+                }
+                if (p->end < start)
+                        break;  /* not found */
+        }
+        read_unlock(&resource_lock);
+        return ret;
+}
+
 void __weak arch_remove_reservations(struct resource *avail)
 {
 }
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index ff7fd80bef99..49e9537f3673 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -59,6 +59,25 @@ static unsigned long soft_lockup_nmi_warn;
 static int hardlockup_panic =
                         CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE;
 
+static bool hardlockup_detector_enabled = true;
+/*
+ * We may not want to enable hard lockup detection by default in all cases,
+ * for example when running the kernel as a guest on a hypervisor. In these
+ * cases this function can be called to disable hard lockup detection. This
+ * function should only be executed once by the boot processor before the
+ * kernel command line parameters are parsed, because otherwise it is not
+ * possible to override this in hardlockup_panic_setup().
+ */
+void watchdog_enable_hardlockup_detector(bool val)
+{
+        hardlockup_detector_enabled = val;
+}
+
+bool watchdog_hardlockup_detector_is_enabled(void)
+{
+        return hardlockup_detector_enabled;
+}
+
 static int __init hardlockup_panic_setup(char *str)
 {
         if (!strncmp(str, "panic", 5))
@@ -67,6 +86,14 @@ static int __init hardlockup_panic_setup(char *str)
                 hardlockup_panic = 0;
         else if (!strncmp(str, "0", 1))
                 watchdog_user_enabled = 0;
+        else if (!strncmp(str, "1", 1) || !strncmp(str, "2", 1)) {
+                /*
+                 * Setting 'nmi_watchdog=1' or 'nmi_watchdog=2' (legacy option)
+                 * has the same effect.
+                 */
+                watchdog_user_enabled = 1;
+                watchdog_enable_hardlockup_detector(true);
+        }
         return 1;
 }
 __setup("nmi_watchdog=", hardlockup_panic_setup);
@@ -465,6 +492,15 @@ static int watchdog_nmi_enable(unsigned int cpu)
         struct perf_event_attr *wd_attr;
         struct perf_event *event = per_cpu(watchdog_ev, cpu);
 
+        /*
+         * Some kernels need to default hard lockup detection to
+         * 'disabled', for example a guest on a hypervisor.
+         */
+        if (!watchdog_hardlockup_detector_is_enabled()) {
+                event = ERR_PTR(-ENOENT);
+                goto handle_err;
+        }
+
         /* is it already setup and enabled? */
         if (event && event->state > PERF_EVENT_STATE_OFF)
                 goto out;
@@ -479,6 +515,7 @@ static int watchdog_nmi_enable(unsigned int cpu)
         /* Try to register using hardware perf events */
         event = perf_event_create_kernel_counter(wd_attr, cpu, NULL, watchdog_overflow_callback, NULL);
 
+handle_err:
         /* save cpu0 error for future comparision */
         if (cpu == 0 && IS_ERR(event))
                 cpu0_err = PTR_ERR(event);
@@ -624,11 +661,13 @@ int proc_dowatchdog(struct ctl_table *table, int write,
                     void __user *buffer, size_t *lenp, loff_t *ppos)
 {
         int err, old_thresh, old_enabled;
+        bool old_hardlockup;
         static DEFINE_MUTEX(watchdog_proc_mutex);
 
         mutex_lock(&watchdog_proc_mutex);
         old_thresh = ACCESS_ONCE(watchdog_thresh);
         old_enabled = ACCESS_ONCE(watchdog_user_enabled);
+        old_hardlockup = watchdog_hardlockup_detector_is_enabled();
 
         err = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
         if (err || !write)
@@ -640,15 +679,22 @@ int proc_dowatchdog(struct ctl_table *table, int write,
          * disabled. The 'watchdog_running' variable check in
          * watchdog_*_all_cpus() function takes care of this.
          */
-        if (watchdog_user_enabled && watchdog_thresh)
+        if (watchdog_user_enabled && watchdog_thresh) {
+                /*
+                 * Prevent a change in watchdog_thresh accidentally overriding
+                 * the enablement of the hardlockup detector.
+                 */
+                if (watchdog_user_enabled != old_enabled)
+                        watchdog_enable_hardlockup_detector(true);
                 err = watchdog_enable_all_cpus(old_thresh != watchdog_thresh);
-        else
+        } else
                 watchdog_disable_all_cpus();
 
         /* Restore old values on failure */
         if (err) {
                 watchdog_thresh = old_thresh;
                 watchdog_user_enabled = old_enabled;
+                watchdog_enable_hardlockup_detector(old_hardlockup);
         }
 out:
         mutex_unlock(&watchdog_proc_mutex);