Merge branch 'tracing-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'tracing-v28-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (131 commits)
  tracing/fastboot: improve help text
  tracing/stacktrace: improve help text
  tracing/fastboot: fix initcalls disposition in bootgraph.pl
  tracing/fastboot: fix bootgraph.pl initcall name regexp
  tracing/fastboot: fix issues and improve output of bootgraph.pl
  tracepoints: synchronize unregister static inline
  tracepoints: tracepoint_synchronize_unregister()
  ftrace: make ftrace_test_p6nop disassembler-friendly
  markers: fix synchronize marker unregister static inline
  tracing/fastboot: add better resolution to initcall debug/tracing
  trace: add build-time check to avoid overrunning hex buffer
  ftrace: fix hex output mode of ftrace
  tracing/fastboot: fix initcalls disposition in bootgraph.pl
  tracing/fastboot: fix printk format typo in boot tracer
  ftrace: return an error when setting a nonexistent tracer
  ftrace: make some tracers reentrant
  ring-buffer: make reentrant
  ring-buffer: move page indexes into page headers
  tracing/fastboot: only trace non-module initcalls
  ftrace: move pc counter in irqtrace
  ...

Manually fix conflicts:
 - init/main.c: initcall tracing
 - kernel/module.c: verbose level vs tracepoints
 - scripts/bootgraph.pl: fallout from cherry-picking commits.

2 files changed, 27 insertions, 14 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 8828ed0b2051..c6b70313bf0b 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -786,6 +786,13 @@ config PROFILING
           Say Y here to enable the extended profiling support mechanisms used
           by profilers such as OProfile.
 
+#
+# Place an empty function call at each tracepoint site. Can be
+# dynamically changed for a probe function.
+#
+config TRACEPOINTS
+        bool
+
 config MARKERS
         bool "Activate markers"
         help
diff --git a/init/main.c b/init/main.c
index 4371d11721f6..3e17a3bafe60 100644
--- a/init/main.c
+++ b/init/main.c
@@ -61,6 +61,7 @@
 #include <linux/sched.h>
 #include <linux/signal.h>
 #include <linux/idr.h>
+#include <linux/ftrace.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -689,6 +690,8 @@ asmlinkage void __init start_kernel(void)
 
         acpi_early_init(); /* before LAPIC and SMP init */
 
+        ftrace_init();
+
         /* Do the rest non-__init'ed, we're now alive */
         rest_init();
 }
@@ -705,30 +708,31 @@ __setup("initcall_debug", initcall_debug_setup);
 int do_one_initcall(initcall_t fn)
 {
         int count = preempt_count();
-        ktime_t t0, t1, delta;
+        ktime_t delta;
         char msgbuf[64];
-        int result;
+        struct boot_trace it;
 
         if (initcall_debug) {
-                printk("calling  %pF @ %i\n", fn, task_pid_nr(current));
-                t0 = ktime_get();
+                it.caller = task_pid_nr(current);
+                printk("calling  %pF @ %i\n", fn, it.caller);
+                it.calltime = ktime_get();
         }
 
-        result = fn();
+        it.result = fn();
 
         if (initcall_debug) {
-                t1 = ktime_get();
-                delta = ktime_sub(t1, t0);
-
-                printk("initcall %pF returned %d after %Ld msecs\n",
-                        fn, result,
-                        (unsigned long long) delta.tv64 >> 20);
+                it.rettime = ktime_get();
+                delta = ktime_sub(it.rettime, it.calltime);
+                it.duration = (unsigned long long) delta.tv64 >> 10;
+                printk("initcall %pF returned %d after %Ld usecs\n", fn,
+                        it.result, it.duration);
+                trace_boot(&it, fn);
         }
 
         msgbuf[0] = 0;
 
-        if (result && result != -ENODEV && initcall_debug)
-                sprintf(msgbuf, "error code %d ", result);
+        if (it.result && it.result != -ENODEV && initcall_debug)
+                sprintf(msgbuf, "error code %d ", it.result);
 
         if (preempt_count() != count) {
                 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
@@ -742,7 +746,7 @@ int do_one_initcall(initcall_t fn)
                 printk("initcall %pF returned with %s\n", fn, msgbuf);
         }
 
-        return result;
+        return it.result;
 }
 
 
@@ -857,6 +861,7 @@ static int __init kernel_init(void * unused)
         smp_prepare_cpus(setup_max_cpus);
 
         do_pre_smp_initcalls();
+        start_boot_trace();
 
         smp_init();
         sched_init_smp();
@@ -883,6 +888,7 @@ static int __init kernel_init(void * unused)
          * we're essentially up and running. Get rid of the
          * initmem segments and start the user-mode stuff..
          */
+        stop_boot_trace();
         init_post();
         return 0;
 }