18 files changed, 84 insertions, 79 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 47ae4a751a59..3ed5ad92b029 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2068,6 +2068,7 @@ config OLPC
         bool "One Laptop Per Child support"
         select GPIOLIB
         select OLPC_OPENFIRMWARE
+        depends on !X86_64 && !X86_PAE
         ---help---
           Add support for detecting the unique features of the OLPC
           XO hardware.
diff --git a/arch/x86/kernel/apb_timer.c b/arch/x86/kernel/apb_timer.c
index 7c9ab59653e8..51ef31a89be9 100644
--- a/arch/x86/kernel/apb_timer.c
+++ b/arch/x86/kernel/apb_timer.c
@@ -313,14 +313,16 @@ static void apbt_setup_irq(struct apbt_dev *adev)
         if (adev->irq == 0)
                 return;
 
+        irq_modify_status(adev->irq, 0, IRQ_MOVE_PCNTXT);
+        irq_set_affinity(adev->irq, cpumask_of(adev->cpu));
+        /* APB timer irqs are set up as mp_irqs, timer is edge type */
+        __set_irq_handler(adev->irq, handle_edge_irq, 0, "edge");
+
         if (system_state == SYSTEM_BOOTING) {
-                irq_modify_status(adev->irq, 0, IRQ_MOVE_PCNTXT);
-                irq_set_affinity(adev->irq, cpumask_of(adev->cpu));
-                /* APB timer irqs are set up as mp_irqs, timer is edge type */
-                __set_irq_handler(adev->irq, handle_edge_irq, 0, "edge");
                 if (request_irq(adev->irq, apbt_interrupt_handler,
-                                IRQF_TIMER | IRQF_DISABLED | IRQF_NOBALANCING,
-                                adev->name, adev)) {
+                                        IRQF_TIMER | IRQF_DISABLED |
+                                        IRQF_NOBALANCING,
+                                        adev->name, adev)) {
                         printk(KERN_ERR "Failed request IRQ for APBT%d\n",
                                adev->num);
                 }
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 823f79a17ad1..ffe5755caa8b 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -464,7 +464,7 @@ unsigned long native_calibrate_tsc(void)
                 tsc_pit_min = min(tsc_pit_min, tsc_pit_khz);
 
                 /* hpet or pmtimer available ? */
-                if (!hpet && !ref1 && !ref2)
+                if (ref1 == ref2)
                         continue;
 
                 /* Check, whether the sampling was disturbed by an SMI */
@@ -935,7 +935,7 @@ static void tsc_refine_calibration_work(struct work_struct *work)
         tsc_stop = tsc_read_refs(&ref_stop, hpet);
 
         /* hpet or pmtimer available ? */
-        if (!hpet && !ref_start && !ref_stop)
+        if (ref_start == ref_stop)
                 goto out;
 
         /* Check, whether the sampling was disturbed by an SMI */
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index d9926afec110..5eb25eb3ea48 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -275,23 +275,19 @@ acpi_table_parse_srat(enum acpi_srat_type id,
 int __init acpi_numa_init(void)
 {
         int ret = 0;
-        int nr_cpu_entries = nr_cpu_ids;
 
-#ifdef CONFIG_X86
         /*
          * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
          * SRAT cpu entries could have different order with that in MADT.
          * So go over all cpu entries in SRAT to get apicid to node mapping.
          */
-        nr_cpu_entries = MAX_LOCAL_APIC;
-#endif
 
         /* SRAT: Static Resource Affinity Table */
         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
-                                     acpi_parse_x2apic_affinity, nr_cpu_entries);
+                                     acpi_parse_x2apic_affinity, 0);
                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
-                                     acpi_parse_processor_affinity, nr_cpu_entries);
+                                     acpi_parse_processor_affinity, 0);
                 ret = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
                                             acpi_parse_memory_affinity,
                                             NR_NODE_MEMBLKS);
diff --git a/include/trace/events/module.h b/include/trace/events/module.h
index c7bb2f0482fe..c6bae36547e5 100644
--- a/include/trace/events/module.h
+++ b/include/trace/events/module.h
@@ -1,5 +1,15 @@
+/*
+ * Because linux/module.h has tracepoints in the header, and ftrace.h
+ * eventually includes this file, define_trace.h includes linux/module.h
+ * But we do not want the module.h to override the TRACE_SYSTEM macro
+ * variable that define_trace.h is processing, so we only set it
+ * when module events are being processed, which would happen when
+ * CREATE_TRACE_POINTS is defined.
+ */
+#ifdef CREATE_TRACE_POINTS
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM module
+#endif
 
 #if !defined(_TRACE_MODULE_H) || defined(TRACE_HEADER_MULTI_READ)
 #define _TRACE_MODULE_H
diff --git a/init/Kconfig b/init/Kconfig
index 4f6cdbf523eb..4e337906016e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -515,21 +515,6 @@ config RCU_BOOST_DELAY
 
           Accept the default if unsure.
 
-config SRCU_SYNCHRONIZE_DELAY
-        int "Microseconds to delay before waiting for readers"
-        range 0 20
-        default 10
-        help
-          This option controls how long SRCU delays before entering its
-          loop waiting on SRCU readers.  The purpose of this loop is
-          to avoid the unconditional context-switch penalty that would
-          otherwise be incurred if there was an active SRCU reader,
-          in a manner similar to adaptive locking schemes.  This should
-          be set to be a bit longer than the common-case SRCU read-side
-          critical-section overhead.
-
-          Accept the default if unsure.
-
 endmenu # "RCU Subsystem"
 
 config IKCONFIG
diff --git a/kernel/futex.c b/kernel/futex.c
index 52075633373f..b766d28accd6 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -826,10 +826,9 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
         new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);
 
         /*
-         * This happens when we have stolen the lock and the original
-         * pending owner did not enqueue itself back on the rt_mutex.
-         * Thats not a tragedy. We know that way, that a lock waiter
-         * is on the fly. We make the futex_q waiter the pending owner.
+         * It is possible that the next waiter (the one that brought
+         * this owner to the kernel) timed out and is no longer
+         * waiting on the lock.
          */
         if (!new_owner)
                 new_owner = this->task;
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 034493724749..0c343b9a46d5 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -189,7 +189,8 @@ static int rcu_kthread(void *arg)
         unsigned long flags;
 
         for (;;) {
-                wait_event(rcu_kthread_wq, have_rcu_kthread_work != 0);
+                wait_event_interruptible(rcu_kthread_wq,
+                                         have_rcu_kthread_work != 0);
                 morework = rcu_boost();
                 local_irq_save(flags);
                 work = have_rcu_kthread_work;
diff --git a/kernel/srcu.c b/kernel/srcu.c
index 98d8c1e80edb..73ce23feaea9 100644
--- a/kernel/srcu.c
+++ b/kernel/srcu.c
@@ -156,6 +156,16 @@ void __srcu_read_unlock(struct srcu_struct *sp, int idx)
 EXPORT_SYMBOL_GPL(__srcu_read_unlock);
 
 /*
+ * We use an adaptive strategy for synchronize_srcu() and especially for
+ * synchronize_srcu_expedited().  We spin for a fixed time period
+ * (defined below) to allow SRCU readers to exit their read-side critical
+ * sections.  If there are still some readers after 10 microseconds,
+ * we repeatedly block for 1-millisecond time periods.  This approach
+ * has done well in testing, so there is no need for a config parameter.
+ */
+#define SYNCHRONIZE_SRCU_READER_DELAY 10
+
+/*
  * Helper function for synchronize_srcu() and synchronize_srcu_expedited().
  */
 static void __synchronize_srcu(struct srcu_struct *sp, void (*sync_func)(void))
@@ -207,11 +217,12 @@ static void __synchronize_srcu(struct srcu_struct *sp, void (*sync_func)(void))
          * will have finished executing.  We initially give readers
          * an arbitrarily chosen 10 microseconds to get out of their
          * SRCU read-side critical sections, then loop waiting 1/HZ
-         * seconds per iteration.
+         * seconds per iteration.  The 10-microsecond value has done
+         * very well in testing.
          */
 
         if (srcu_readers_active_idx(sp, idx))
-                udelay(CONFIG_SRCU_SYNCHRONIZE_DELAY);
+                udelay(SYNCHRONIZE_SRCU_READER_DELAY);
         while (srcu_readers_active_idx(sp, idx))
                 schedule_timeout_interruptible(1);
 
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index c50a034de30f..6519cf62d9cd 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -113,7 +113,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
  * @shift:      pointer to shift variable
  * @from:       frequency to convert from
  * @to:         frequency to convert to
- * @minsec:     guaranteed runtime conversion range in seconds
+ * @maxsec:     guaranteed runtime conversion range in seconds
  *
  * The function evaluates the shift/mult pair for the scaled math
  * operations of clocksources and clockevents.
@@ -122,7 +122,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
  * NSEC_PER_SEC == 1GHz and @from is the counter frequency. For clock
  * event @to is the counter frequency and @from is NSEC_PER_SEC.
  *
- * The @minsec conversion range argument controls the time frame in
+ * The @maxsec conversion range argument controls the time frame in
  * seconds which must be covered by the runtime conversion with the
  * calculated mult and shift factors. This guarantees that no 64bit
  * overflow happens when the input value of the conversion is
@@ -131,7 +131,7 @@ EXPORT_SYMBOL_GPL(timecounter_cyc2time);
  * factors.
  */
 void
-clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec)
+clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 maxsec)
 {
         u64 tmp;
         u32 sft, sftacc= 32;
@@ -140,7 +140,7 @@ clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec)
          * Calculate the shift factor which is limiting the conversion
          * range:
          */
-        tmp = ((u64)minsec * from) >> 32;
+        tmp = ((u64)maxsec * from) >> 32;
         while (tmp) {
                 tmp >>=1;
                 sftacc--;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 5536aaf3ba36..d27c7562902c 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -49,7 +49,7 @@ struct timekeeper {
         u32     mult;
 };
 
-struct timekeeper timekeeper;
+static struct timekeeper timekeeper;
 
 /**
  * timekeeper_setup_internals - Set up internals to use clocksource clock.
@@ -164,7 +164,7 @@ static struct timespec total_sleep_time;
 /*
  * The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock.
  */
-struct timespec raw_time;
+static struct timespec raw_time;
 
 /* flag for if timekeeping is suspended */
 int __read_mostly timekeeping_suspended;
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index bac752f0cfb5..b706529b4fc7 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -23,9 +23,6 @@ static int syscall_exit_register(struct ftrace_event_call *event,
 static int syscall_enter_define_fields(struct ftrace_event_call *call);
 static int syscall_exit_define_fields(struct ftrace_event_call *call);
 
-/* All syscall exit events have the same fields */
-static LIST_HEAD(syscall_exit_fields);
-
 static struct list_head *
 syscall_get_enter_fields(struct ftrace_event_call *call)
 {
@@ -34,34 +31,28 @@ syscall_get_enter_fields(struct ftrace_event_call *call)
         return &entry->enter_fields;
 }
 
-static struct list_head *
-syscall_get_exit_fields(struct ftrace_event_call *call)
-{
-        return &syscall_exit_fields;
-}
-
 struct trace_event_functions enter_syscall_print_funcs = {
-        .trace                  = print_syscall_enter,
+        .trace          = print_syscall_enter,
 };
 
 struct trace_event_functions exit_syscall_print_funcs = {
-        .trace                  = print_syscall_exit,
+        .trace          = print_syscall_exit,
 };
 
 struct ftrace_event_class event_class_syscall_enter = {
-        .system                 = "syscalls",
-        .reg                    = syscall_enter_register,
-        .define_fields          = syscall_enter_define_fields,
-        .get_fields             = syscall_get_enter_fields,
-        .raw_init               = init_syscall_trace,
+        .system         = "syscalls",
+        .reg            = syscall_enter_register,
+        .define_fields  = syscall_enter_define_fields,
+        .get_fields     = syscall_get_enter_fields,
+        .raw_init       = init_syscall_trace,
 };
 
 struct ftrace_event_class event_class_syscall_exit = {
-        .system                 = "syscalls",
-        .reg                    = syscall_exit_register,
-        .define_fields          = syscall_exit_define_fields,
-        .get_fields             = syscall_get_exit_fields,
-        .raw_init               = init_syscall_trace,
+        .system         = "syscalls",
+        .reg            = syscall_exit_register,
+        .define_fields  = syscall_exit_define_fields,
+        .fields         = LIST_HEAD_INIT(event_class_syscall_exit.fields),
+        .raw_init       = init_syscall_trace,
 };
 
 extern unsigned long __start_syscalls_metadata[];
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 52462ae26455..e032716c839b 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -61,6 +61,9 @@ OPTIONS
 -r::
 --realtime=::
         Collect data with this RT SCHED_FIFO priority.
+-D::
+--no-delay::
+        Collect data without buffering.
 -A::
 --append::
         Append to the output file to do incremental profiling.
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 7069bd3e90b3..df6064ad9bf2 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -49,6 +49,7 @@ static int			pipe_output			=      0;
 static const char               *output_name                    = "perf.data";
 static int                      group                           =      0;
 static int                      realtime_prio                   =      0;
+static bool                     nodelay                         =  false;
 static bool                     raw_samples                     =  false;
 static bool                     sample_id_all_avail             =   true;
 static bool                     system_wide                     =  false;
@@ -307,6 +308,11 @@ static void create_counter(struct perf_evsel *evsel, int cpu)
                 attr->sample_type       |= PERF_SAMPLE_CPU;
         }
 
+        if (nodelay) {
+                attr->watermark = 0;
+                attr->wakeup_events = 1;
+        }
+
         attr->mmap              = track;
         attr->comm              = track;
         attr->inherit           = !no_inherit;
@@ -331,9 +337,6 @@ try_again:
                         else if (err ==  ENODEV && cpu_list) {
                                 die("No such device - did you specify"
                                         " an out-of-range profile CPU?\n");
-                        } else if (err == ENOENT) {
-                                die("%s event is not supported. ",
-                                     event_name(evsel));
                         } else if (err == EINVAL && sample_id_all_avail) {
                                 /*
                                  * Old kernel, no attr->sample_id_type_all field
@@ -480,6 +483,7 @@ static void atexit_header(void)
                         process_buildids();
                 perf_header__write(&session->header, output, true);
                 perf_session__delete(session);
+                perf_evsel_list__delete();
                 symbol__exit();
         }
 }
@@ -845,6 +849,8 @@ const struct option record_options[] = {
                     "record events on existing thread id"),
         OPT_INTEGER('r', "realtime", &realtime_prio,
                     "collect data with this RT SCHED_FIFO priority"),
+        OPT_BOOLEAN('D', "no-delay", &nodelay,
+                    "collect data without buffering"),
         OPT_BOOLEAN('R', "raw-samples", &raw_samples,
                     "collect raw sample records from all opened counters"),
         OPT_BOOLEAN('a', "all-cpus", &system_wide,
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index abd4b8497bc4..29e7ffd85690 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1843,15 +1843,15 @@ static const char *record_args[] = {
         "-f",
         "-m", "1024",
         "-c", "1",
-        "-e", "sched:sched_switch:r",
-        "-e", "sched:sched_stat_wait:r",
-        "-e", "sched:sched_stat_sleep:r",
-        "-e", "sched:sched_stat_iowait:r",
-        "-e", "sched:sched_stat_runtime:r",
-        "-e", "sched:sched_process_exit:r",
-        "-e", "sched:sched_process_fork:r",
-        "-e", "sched:sched_wakeup:r",
-        "-e", "sched:sched_migrate_task:r",
+        "-e", "sched:sched_switch",
+        "-e", "sched:sched_stat_wait",
+        "-e", "sched:sched_stat_sleep",
+        "-e", "sched:sched_stat_iowait",
+        "-e", "sched:sched_stat_runtime",
+        "-e", "sched:sched_process_exit",
+        "-e", "sched:sched_process_fork",
+        "-e", "sched:sched_wakeup",
+        "-e", "sched:sched_migrate_task",
 };
 
 static int __cmd_record(int argc, const char **argv)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index c385a63ebfd1..0ff11d9b13be 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -743,6 +743,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
 out_free_fd:
         list_for_each_entry(pos, &evsel_list, node)
                 perf_evsel__free_stat_priv(pos);
+        perf_evsel_list__delete();
 out:
         thread_map__delete(threads);
         threads = NULL;
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 6ce4042421bd..05344c6210ac 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1247,8 +1247,6 @@ try_again:
                                 die("Permission error - are you root?\n"
                                         "\t Consider tweaking"
                                         " /proc/sys/kernel/perf_event_paranoid.\n");
-                        if (err == ENOENT)
-                                die("%s event is not supported. ", event_name(evsel));
                         /*
                          * If it's cycles then fall back to hrtimer
                          * based cpu-clock-tick sw counter, which
@@ -1473,6 +1471,8 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
                 pos->attr.sample_period = default_interval;
         }
 
+        sym_evsel = list_entry(evsel_list.next, struct perf_evsel, node);
+
         symbol_conf.priv_size = (sizeof(struct sym_entry) +
                                  (nr_counters + 1) * sizeof(unsigned long));
 
@@ -1490,6 +1490,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
 out_free_fd:
         list_for_each_entry(pos, &evsel_list, node)
                 perf_evsel__free_mmap(pos);
+        perf_evsel_list__delete();
 
         return status;
 }
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 5b1ecd66bb36..595d0f4a7103 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -286,8 +286,6 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
         status = p->fn(argc, argv, prefix);
         exit_browser(status);
 
-        perf_evsel_list__delete();
-
         if (status)
                 return status & 0xff;