4 files changed, 161 insertions, 149 deletions

diff --git a/init/Kconfig b/init/Kconfig
index a3e3bf548046..38396ec7ee36 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -298,6 +298,98 @@ config AUDIT_TREE
         def_bool y
         depends on AUDITSYSCALL && INOTIFY
 
+menu "RCU Subsystem"
+
+choice
+        prompt "RCU Implementation"
+        default CLASSIC_RCU
+
+config CLASSIC_RCU
+        bool "Classic RCU"
+        help
+          This option selects the classic RCU implementation that is
+          designed for best read-side performance on non-realtime
+          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.
+
+endmenu # "RCU Subsystem"
+
 config IKCONFIG
         tristate "Kernel .config support"
         ---help---
@@ -383,26 +475,26 @@ config CGROUP_SCHED
           This option allows you to create arbitrary task groups
           using the "cgroup" pseudo filesystem and control
           the cpu bandwidth allocated to each such task group.
-          Refer to Documentation/cgroups.txt for more information
-          on "cgroup" pseudo filesystem.
+          Refer to Documentation/cgroups/cgroups.txt for more
+          information on "cgroup" pseudo filesystem.
 
 endchoice
 
-menu "Control Group support"
-config CGROUPS
-        bool "Control Group support"
+menuconfig CGROUPS
+        boolean "Control Group support"
         help
-          This option add support for grouping sets of processes together, for
+          This option adds support for grouping sets of processes together, for
           use with process control subsystems such as Cpusets, CFS, memory
           controls or device isolation.
           See
-                - Documentation/cpusets.txt     (Cpusets)
                 - Documentation/scheduler/sched-design-CFS.txt  (CFS)
-                - Documentation/cgroups/ (features for grouping, isolation)
-                - Documentation/controllers/ (features for resource control)
+                - Documentation/cgroups/ (features for grouping, isolation
+                                          and resource control)
 
           Say N if unsure.
 
+if CGROUPS
+
 config CGROUP_DEBUG
         bool "Example debug cgroup subsystem"
         depends on CGROUPS
@@ -410,24 +502,24 @@ config CGROUP_DEBUG
         help
           This option enables a simple cgroup subsystem that
           exports useful debugging information about the cgroups
-          framework
+          framework.
 
-          Say N if unsure
+          Say N if unsure.
 
 config CGROUP_NS
-        bool "Namespace cgroup subsystem"
-        depends on CGROUPS
-        help
-          Provides a simple namespace cgroup subsystem to
-          provide hierarchical naming of sets of namespaces,
-          for instance virtual servers and checkpoint/restart
-          jobs.
+        bool "Namespace cgroup subsystem"
+        depends on CGROUPS
+        help
+          Provides a simple namespace cgroup subsystem to
+          provide hierarchical naming of sets of namespaces,
+          for instance virtual servers and checkpoint/restart
+          jobs.
 
 config CGROUP_FREEZER
-        bool "control group freezer subsystem"
-        depends on CGROUPS
-        help
-          Provides a way to freeze and unfreeze all tasks in a
+        bool "Freezer cgroup subsystem"
+        depends on CGROUPS
+        help
+          Provides a way to freeze and unfreeze all tasks in a
           cgroup.
 
 config CGROUP_DEVICE
@@ -448,18 +540,23 @@ config CPUSETS
 
           Say N if unsure.
 
+config PROC_PID_CPUSET
+        bool "Include legacy /proc/<pid>/cpuset file"
+        depends on CPUSETS
+        default y
+
 config CGROUP_CPUACCT
         bool "Simple CPU accounting cgroup subsystem"
         depends on CGROUPS
         help
           Provides a simple Resource Controller for monitoring the
-          total CPU consumed by the tasks in a cgroup
+          total CPU consumed by the tasks in a cgroup.
 
 config RESOURCE_COUNTERS
         bool "Resource counters"
         help
           This option enables controller independent resource accounting
-          infrastructure that works with cgroups
+          infrastructure that works with cgroups.
         depends on CGROUPS
 
 config CGROUP_MEM_RES_CTLR
@@ -485,9 +582,6 @@ config CGROUP_MEM_RES_CTLR
           This config option also selects MM_OWNER config option, which
           could in turn add some fork/exit overhead.
 
-config MM_OWNER
-        bool
-
 config CGROUP_MEM_RES_CTLR_SWAP
         bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)"
         depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL
@@ -504,8 +598,10 @@ config CGROUP_MEM_RES_CTLR_SWAP
           there will be no overhead from this. Even when you set this config=y,
           if boot option "noswapaccount" is set, swap will not be accounted.
 
+endif # CGROUPS
 
-endmenu
+config MM_OWNER
+        bool
 
 config SYSFS_DEPRECATED
         bool
@@ -543,11 +639,6 @@ config SYSFS_DEPRECATED_V2
           if the original kernel, that came with your distribution, has
           this option set to N.
 
-config PROC_PID_CPUSET
-        bool "Include legacy /proc/<pid>/cpuset file"
-        depends on CPUSETS
-        default y
-
 config RELAY
         bool "Kernel->user space relay support (formerly relayfs)"
         help
@@ -602,6 +693,14 @@ config PID_NS
           Unless you want to work with an experimental feature
           say N here.
 
+config NET_NS
+        bool "Network namespace"
+        default n
+        depends on NAMESPACES && EXPERIMENTAL && NET
+        help
+          Allow user space to create what appear to be multiple instances
+          of the network stack.
+
 config BLK_DEV_INITRD
         bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
         depends on BROKEN || !FRV
@@ -636,6 +735,9 @@ config CC_OPTIMIZE_FOR_SIZE
 config SYSCTL
         bool
 
+config ANON_INODES
+        bool
+
 menuconfig EMBEDDED
         bool "Configure standard kernel features (for small systems)"
         help
@@ -686,13 +788,6 @@ 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
@@ -748,18 +843,6 @@ config PCSPKR_PLATFORM
           This option allows to disable the internal PC-Speaker
           support, saving some memory.
 
-config COMPAT_BRK
-        bool "Disable heap randomization"
-        default y
-        help
-          Randomizing heap placement makes heap exploits harder, but it
-          also breaks ancient binaries (including anything libc5 based).
-          This option changes the bootup default to heap randomization
-          disabled, and can be overriden runtime by setting
-          /proc/sys/kernel/randomize_va_space to 2.
-
-          On non-ancient distros (post-2000 ones) N is usually a safe choice.
-
 config BASE_FULL
         default y
         bool "Enable full-sized data structures for core" if EMBEDDED
@@ -777,9 +860,6 @@ config FUTEX
           support for "fast userspace mutexes".  The resulting kernel may not
           run glibc-based applications correctly.
 
-config ANON_INODES
-        bool
-
 config EPOLL
         bool "Enable eventpoll support" if EMBEDDED
         default y
@@ -865,6 +945,18 @@ config SLUB_DEBUG
           SLUB sysfs support. /sys/slab will not exist and there will be
           no support for cache validation etc.
 
+config COMPAT_BRK
+        bool "Disable heap randomization"
+        default y
+        help
+          Randomizing heap placement makes heap exploits harder, but it
+          also breaks ancient binaries (including anything libc5 based).
+          This option changes the bootup default to heap randomization
+          disabled, and can be overriden runtime by setting
+          /proc/sys/kernel/randomize_va_space to 2.
+
+          On non-ancient distros (post-2000 ones) N is usually a safe choice.
+
 choice
         prompt "Choose SLAB allocator"
         default SLUB
@@ -1033,90 +1125,3 @@ source "block/Kconfig"
 config PREEMPT_NOTIFIERS
         bool
 
-choice
-        prompt "RCU Implementation"
-        default CLASSIC_RCU
-
-config CLASSIC_RCU
-        bool "Classic RCU"
-        help
-          This option selects the classic RCU implementation that is
-          designed for best read-side performance on non-realtime
-          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/do_mounts.c b/init/do_mounts.c
index 708105e163df..8d4ff5afc1d8 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -370,10 +370,14 @@ void __init prepare_namespace(void)
                 ssleep(root_delay);
         }
 
-        /* wait for the known devices to complete their probing */
-        while (driver_probe_done() != 0)
-                msleep(100);
-        async_synchronize_full();
+        /*
+         * wait for the known devices to complete their probing
+         *
+         * Note: this is a potential source of long boot delays.
+         * For example, it is not atypical to wait 5 seconds here
+         * for the touchpad of a laptop to initialize.
+         */
+        wait_for_device_probe();
 
         md_run_setup();
 
@@ -399,6 +403,7 @@ void __init prepare_namespace(void)
                 while (driver_probe_done() != 0 ||
                         (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0)
                         msleep(100);
+                async_synchronize_full();
         }
 
         is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR;
diff --git a/init/do_mounts_md.c b/init/do_mounts_md.c
index ff95e3192884..9bdddbcb3d6a 100644
--- a/init/do_mounts_md.c
+++ b/init/do_mounts_md.c
@@ -281,8 +281,9 @@ static void __init autodetect_raid(void)
          */
         printk(KERN_INFO "md: Waiting for all devices to be available before autodetect\n");
         printk(KERN_INFO "md: If you don't use raid, use raid=noautodetect\n");
-        while (driver_probe_done() < 0)
-                msleep(100);
+
+        wait_for_device_probe();
+
         fd = sys_open("/dev/md0", 0, 0);
         if (fd >= 0) {
                 sys_ioctl(fd, RAID_AUTORUN, raid_autopart);
diff --git a/init/main.c b/init/main.c
index 844209453c02..83697e160b3a 100644
--- a/init/main.c
+++ b/init/main.c
@@ -97,7 +97,7 @@ static inline void mark_rodata_ro(void) { }
 extern void tc_init(void);
 #endif
 
-enum system_states system_state;
+enum system_states system_state __read_mostly;
 EXPORT_SYMBOL(system_state);
 
 /*
@@ -463,6 +463,7 @@ static noinline void __init_refok rest_init(void)
          * at least once to get things moving:
          */
         init_idle_bootup_task(current);
+        rcu_scheduler_starting();
         preempt_enable_no_resched();
         schedule();
         preempt_disable();