3 files changed, 117 insertions, 33 deletions

diff --git a/init/Kconfig b/init/Kconfig
index 7be4d3836745..1ce05a4cb5f6 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -16,6 +16,11 @@ config DEFCONFIG_LIST
         default "$ARCH_DEFCONFIG"
         default "arch/$ARCH/defconfig"
 
+config CONSTRUCTORS
+        bool
+        depends on !UML
+        default y
+
 menu "General setup"
 
 config EXPERIMENTAL
@@ -302,13 +307,14 @@ config AUDITSYSCALL
 
 config AUDIT_TREE
         def_bool y
-        depends on AUDITSYSCALL && INOTIFY
+        depends on AUDITSYSCALL
+        select INOTIFY
 
 menu "RCU Subsystem"
 
 choice
         prompt "RCU Implementation"
-        default CLASSIC_RCU
+        default TREE_RCU
 
 config CLASSIC_RCU
         bool "Classic RCU"
@@ -615,13 +621,13 @@ config SYSFS_DEPRECATED
         bool
 
 config SYSFS_DEPRECATED_V2
-        bool "Create deprecated sysfs layout for older userspace tools"
+        bool "remove sysfs features which may confuse old userspace tools"
         depends on SYSFS
-        default y
+        default n
         select SYSFS_DEPRECATED
         help
           This option switches the layout of sysfs to the deprecated
-          version.
+          version. Do not use it on recent distributions.
 
           The current sysfs layout features a unified device tree at
           /sys/devices/, which is able to express a hierarchy between
@@ -808,14 +814,6 @@ config KALLSYMS_EXTRA_PASS
            you wait for kallsyms to be fixed.
 
 
-config STRIP_ASM_SYMS
-        bool "Strip assembler-generated symbols during link"
-        default n
-        help
-          Strip internal assembler-generated symbols during a link (symbols
-          that look like '.Lxxx') so they don't pollute the output of
-          get_wchan() and suchlike.
-
 config HOTPLUG
         bool "Support for hot-pluggable devices" if EMBEDDED
         default y
@@ -933,6 +931,42 @@ config AIO
           by some high performance threaded applications. Disabling
           this option saves about 7k.
 
+config HAVE_PERF_COUNTERS
+        bool
+        help
+          See tools/perf/design.txt for details.
+
+menu "Performance Counters"
+
+config PERF_COUNTERS
+        bool "Kernel Performance Counters"
+        depends on HAVE_PERF_COUNTERS
+        select ANON_INODES
+        help
+          Enable kernel support for performance counter hardware.
+
+          Performance counters are special hardware registers available
+          on most modern CPUs. These registers count the number of certain
+          types of hw events: such as instructions executed, cachemisses
+          suffered, or branches mis-predicted - without slowing down the
+          kernel or applications. These registers can also trigger interrupts
+          when a threshold number of events have passed - and can thus be
+          used to profile the code that runs on that CPU.
+
+          The Linux Performance Counter subsystem provides an abstraction of
+          these hardware capabilities, available via a system call. It
+          provides per task and per CPU counters, and it provides event
+          capabilities on top of those.
+
+          Say Y if unsure.
+
+config EVENT_PROFILE
+        bool "Tracepoint profile sources"
+        depends on PERF_COUNTERS && EVENT_TRACER
+        default y
+
+endmenu
+
 config VM_EVENT_COUNTERS
         default y
         bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
@@ -961,6 +995,14 @@ config SLUB_DEBUG
           SLUB sysfs support. /sys/slab will not exist and there will be
           no support for cache validation etc.
 
+config STRIP_ASM_SYMS
+        bool "Strip assembler-generated symbols during link"
+        default n
+        help
+          Strip internal assembler-generated symbols during a link (symbols
+          that look like '.Lxxx') so they don't pollute the output of
+          get_wchan() and suchlike.
+
 config COMPAT_BRK
         bool "Disable heap randomization"
         default y
diff --git a/init/do_mounts.c b/init/do_mounts.c
index dd7ee5f203f3..093f65915501 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -231,7 +231,8 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
 
 void __init mount_block_root(char *name, int flags)
 {
-        char *fs_names = __getname();
+        char *fs_names = __getname_gfp(GFP_KERNEL
+                | __GFP_NOTRACK_FALSE_POSITIVE);
         char *p;
 #ifdef CONFIG_BLOCK
         char b[BDEVNAME_SIZE];
diff --git a/init/main.c b/init/main.c
index f1b9f0fdb1b4..2c5ade79eb81 100644
--- a/init/main.c
+++ b/init/main.c
@@ -57,6 +57,7 @@
 #include <linux/debug_locks.h>
 #include <linux/debugobjects.h>
 #include <linux/lockdep.h>
+#include <linux/kmemleak.h>
 #include <linux/pid_namespace.h>
 #include <linux/device.h>
 #include <linux/kthread.h>
@@ -65,6 +66,8 @@
 #include <linux/idr.h>
 #include <linux/ftrace.h>
 #include <linux/async.h>
+#include <linux/kmemcheck.h>
+#include <linux/kmemtrace.h>
 #include <trace/boot.h>
 
 #include <asm/io.h>
@@ -72,7 +75,6 @@
 #include <asm/setup.h>
 #include <asm/sections.h>
 #include <asm/cacheflush.h>
-#include <trace/kmemtrace.h>
 
 #ifdef CONFIG_X86_LOCAL_APIC
 #include <asm/smp.h>
@@ -529,6 +531,22 @@ void __init __weak thread_info_cache_init(void)
 {
 }
 
+/*
+ * Set up kernel memory allocators
+ */
+static void __init mm_init(void)
+{
+        /*
+         * page_cgroup requires countinous pages as memmap
+         * and it's bigger than MAX_ORDER unless SPARSEMEM.
+         */
+        page_cgroup_init_flatmem();
+        mem_init();
+        kmem_cache_init();
+        pgtable_cache_init();
+        vmalloc_init();
+}
+
 asmlinkage void __init start_kernel(void)
 {
         char * command_line;
@@ -570,6 +588,23 @@ asmlinkage void __init start_kernel(void)
         setup_nr_cpu_ids();
         smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
 
+        build_all_zonelists();
+        page_alloc_init();
+
+        printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
+        parse_early_param();
+        parse_args("Booting kernel", static_command_line, __start___param,
+                   __stop___param - __start___param,
+                   &unknown_bootoption);
+        /*
+         * These use large bootmem allocations and must precede
+         * kmem_cache_init()
+         */
+        pidhash_init();
+        vfs_caches_init_early();
+        sort_main_extable();
+        trap_init();
+        mm_init();
         /*
          * Set up the scheduler prior starting any interrupts (such as the
          * timer interrupt). Full topology setup happens at smp_init()
@@ -581,25 +616,16 @@ asmlinkage void __init start_kernel(void)
          * fragile until we cpu_idle() for the first time.
          */
         preempt_disable();
-        build_all_zonelists();
-        page_alloc_init();
-        printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
-        parse_early_param();
-        parse_args("Booting kernel", static_command_line, __start___param,
-                   __stop___param - __start___param,
-                   &unknown_bootoption);
         if (!irqs_disabled()) {
                 printk(KERN_WARNING "start_kernel(): bug: interrupts were "
                                 "enabled *very* early, fixing it\n");
                 local_irq_disable();
         }
-        sort_main_extable();
-        trap_init();
         rcu_init();
         /* init some links before init_ISA_irqs() */
         early_irq_init();
         init_IRQ();
-        pidhash_init();
+        prio_tree_init();
         init_timers();
         hrtimers_init();
         softirq_init();
@@ -613,6 +639,11 @@ asmlinkage void __init start_kernel(void)
         early_boot_irqs_on();
         local_irq_enable();
 
+        /* Interrupts are enabled now so all GFP allocations are safe. */
+        set_gfp_allowed_mask(__GFP_BITS_MASK);
+
+        kmem_cache_init_late();
+
         /*
          * HACK ALERT! This is early. We're enabling the console before
          * we've done PCI setups etc, and console_init() must be aware of
@@ -641,15 +672,10 @@ asmlinkage void __init start_kernel(void)
                 initrd_start = 0;
         }
 #endif
-        vmalloc_init();
-        vfs_caches_init_early();
-        cpuset_init_early();
         page_cgroup_init();
-        mem_init();
         enable_debug_pagealloc();
-        cpu_hotplug_init();
-        kmem_cache_init();
         kmemtrace_init();
+        kmemleak_init();
         debug_objects_mem_init();
         idr_init_cache();
         setup_per_cpu_pageset();
@@ -658,8 +684,6 @@ asmlinkage void __init start_kernel(void)
                 late_time_init();
         calibrate_delay();
         pidmap_init();
-        pgtable_cache_init();
-        prio_tree_init();
         anon_vma_init();
 #ifdef CONFIG_X86
         if (efi_enabled)
@@ -695,6 +719,17 @@ asmlinkage void __init start_kernel(void)
         rest_init();
 }
 
+/* Call all constructor functions linked into the kernel. */
+static void __init do_ctors(void)
+{
+#ifdef CONFIG_CONSTRUCTORS
+        ctor_fn_t *call = (ctor_fn_t *) __ctors_start;
+
+        for (; call < (ctor_fn_t *) __ctors_end; call++)
+                (*call)();
+#endif
+}
+
 int initcall_debug;
 core_param(initcall_debug, initcall_debug, bool, 0644);
 
@@ -775,6 +810,7 @@ static void __init do_basic_setup(void)
         usermodehelper_init();
         driver_init();
         init_irq_proc();
+        do_ctors();
         do_initcalls();
 }
 
@@ -842,6 +878,11 @@ static noinline int init_post(void)
 static int __init kernel_init(void * unused)
 {
         lock_kernel();
+
+        /*
+         * init can allocate pages on any node
+         */
+        set_mems_allowed(node_possible_map);
         /*
          * init can run on any cpu.
          */