2 files changed, 112 insertions, 18 deletions

diff --git a/init/Kconfig b/init/Kconfig
index f763762d544a..13627191a60d 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -588,6 +588,13 @@ config KALLSYMS_ALL
 
            Say N.
 
+config KALLSYMS_STRIP_GENERATED
+        bool "Strip machine generated symbols from kallsyms"
+        depends on KALLSYMS_ALL
+        default y
+        help
+          Say N if you want kallsyms to retain even machine generated symbols.
+
 config KALLSYMS_EXTRA_PASS
         bool "Do an extra kallsyms pass"
         depends on KALLSYMS
@@ -808,6 +815,7 @@ config TRACEPOINTS
 
 config MARKERS
         bool "Activate markers"
+        depends on TRACEPOINTS
         help
           Place an empty function call at each marker site. Can be
           dynamically changed for a probe function.
@@ -928,10 +936,90 @@ source "block/Kconfig"
 config PREEMPT_NOTIFIERS
         bool
 
+choice
+        prompt "RCU Implementation"
+        default CLASSIC_RCU
+
 config CLASSIC_RCU
-        def_bool !PREEMPT_RCU
+        bool "Classic RCU"
         help
           This option selects the classic RCU implementation that is
           designed for best read-side performance on non-realtime
-          systems.  Classic RCU is the default.  Note that the
-          PREEMPT_RCU symbol is used to select/deselect this option.
+          systems.
+
+          Select this option if you are unsure.
+
+config TREE_RCU
+        bool "Tree-based hierarchical RCU"
+        help
+          This option selects the RCU implementation that is
+          designed for very large SMP system with hundreds or
+          thousands of CPUs.
+
+config PREEMPT_RCU
+        bool "Preemptible RCU"
+        depends on PREEMPT
+        help
+          This option reduces the latency of the kernel by making certain
+          RCU sections preemptible. Normally RCU code is non-preemptible, if
+          this option is selected then read-only RCU sections become
+          preemptible. This helps latency, but may expose bugs due to
+          now-naive assumptions about each RCU read-side critical section
+          remaining on a given CPU through its execution.
+
+endchoice
+
+config RCU_TRACE
+        bool "Enable tracing for RCU"
+        depends on TREE_RCU || PREEMPT_RCU
+        help
+          This option provides tracing in RCU which presents stats
+          in debugfs for debugging RCU implementation.
+
+          Say Y here if you want to enable RCU tracing
+          Say N if you are unsure.
+
+config RCU_FANOUT
+        int "Tree-based hierarchical RCU fanout value"
+        range 2 64 if 64BIT
+        range 2 32 if !64BIT
+        depends on TREE_RCU
+        default 64 if 64BIT
+        default 32 if !64BIT
+        help
+          This option controls the fanout of hierarchical implementations
+          of RCU, allowing RCU to work efficiently on machines with
+          large numbers of CPUs.  This value must be at least the cube
+          root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit
+          systems and up to 262,144 for 64-bit systems.
+
+          Select a specific number if testing RCU itself.
+          Take the default if unsure.
+
+config RCU_FANOUT_EXACT
+        bool "Disable tree-based hierarchical RCU auto-balancing"
+        depends on TREE_RCU
+        default n
+        help
+          This option forces use of the exact RCU_FANOUT value specified,
+          regardless of imbalances in the hierarchy.  This is useful for
+          testing RCU itself, and might one day be useful on systems with
+          strong NUMA behavior.
+
+          Without RCU_FANOUT_EXACT, the code will balance the hierarchy.
+
+          Say N if unsure.
+
+config TREE_RCU_TRACE
+        def_bool RCU_TRACE && TREE_RCU
+        select DEBUG_FS
+        help
+          This option provides tracing for the TREE_RCU implementation,
+          permitting Makefile to trivially select kernel/rcutree_trace.c.
+
+config PREEMPT_RCU_TRACE
+        def_bool RCU_TRACE && PREEMPT_RCU
+        select DEBUG_FS
+        help
+          This option provides tracing for the PREEMPT_RCU implementation,
+          permitting Makefile to trivially select kernel/rcupreempt_trace.c.
diff --git a/init/main.c b/init/main.c
index 2c183abbf61c..f5e64f20d2b0 100644
--- a/init/main.c
+++ b/init/main.c
@@ -63,6 +63,7 @@
 #include <linux/signal.h>
 #include <linux/idr.h>
 #include <linux/ftrace.h>
+#include <trace/boot.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -671,6 +672,7 @@ asmlinkage void __init start_kernel(void)
                 efi_enter_virtual_mode();
 #endif
         thread_info_cache_init();
+        cred_init();
         fork_init(num_physpages);
         proc_caches_init();
         buffer_init();
@@ -705,31 +707,35 @@ core_param(initcall_debug, initcall_debug, bool, 0644);
 int do_one_initcall(initcall_t fn)
 {
         int count = preempt_count();
-        ktime_t delta;
+        ktime_t calltime, delta, rettime;
         char msgbuf[64];
-        struct boot_trace it;
+        struct boot_trace_call call;
+        struct boot_trace_ret ret;
 
         if (initcall_debug) {
-                it.caller = task_pid_nr(current);
-                printk("calling  %pF @ %i\n", fn, it.caller);
-                it.calltime = ktime_get();
+                call.caller = task_pid_nr(current);
+                printk("calling  %pF @ %i\n", fn, call.caller);
+                calltime = ktime_get();
+                trace_boot_call(&call, fn);
+                enable_boot_trace();
         }
 
-        it.result = fn();
+        ret.result = fn();
 
         if (initcall_debug) {
-                it.rettime = ktime_get();
-                delta = ktime_sub(it.rettime, it.calltime);
-                it.duration = (unsigned long long) delta.tv64 >> 10;
+                disable_boot_trace();
+                rettime = ktime_get();
+                delta = ktime_sub(rettime, calltime);
+                ret.duration = (unsigned long long) ktime_to_ns(delta) >> 10;
+                trace_boot_ret(&ret, fn);
                 printk("initcall %pF returned %d after %Ld usecs\n", fn,
-                        it.result, it.duration);
-                trace_boot(&it, fn);
+                        ret.result, ret.duration);
         }
 
         msgbuf[0] = 0;
 
-        if (it.result && it.result != -ENODEV && initcall_debug)
-                sprintf(msgbuf, "error code %d ", it.result);
+        if (ret.result && ret.result != -ENODEV && initcall_debug)
+                sprintf(msgbuf, "error code %d ", ret.result);
 
         if (preempt_count() != count) {
                 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
@@ -743,7 +749,7 @@ int do_one_initcall(initcall_t fn)
                 printk("initcall %pF returned with %s\n", fn, msgbuf);
         }
 
-        return it.result;
+        return ret.result;
 }
 
 
@@ -884,7 +890,7 @@ 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;
 }