9 files changed, 174 insertions, 128 deletions

diff --git a/init/Kconfig b/init/Kconfig
index eb4b33725db1..eb77e8ccde1c 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -115,10 +115,13 @@ config HAVE_KERNEL_BZIP2
 config HAVE_KERNEL_LZMA
         bool
 
+config HAVE_KERNEL_LZO
+        bool
+
 choice
         prompt "Kernel compression mode"
         default KERNEL_GZIP
-        depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA
+        depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_LZO
         help
           The linux kernel is a kind of self-extracting executable.
           Several compression algorithms are available, which differ
@@ -141,9 +144,8 @@ config KERNEL_GZIP
         bool "Gzip"
         depends on HAVE_KERNEL_GZIP
         help
-          The old and tried gzip compression. Its compression ratio is
-          the poorest among the 3 choices; however its speed (both
-          compression and decompression) is the fastest.
+          The old and tried gzip compression. It provides a good balance
+          between compression ratio and decompression speed.
 
 config KERNEL_BZIP2
         bool "Bzip2"
@@ -164,6 +166,14 @@ config KERNEL_LZMA
           two. Compression is slowest.  The kernel size is about 33%
           smaller with LZMA in comparison to gzip.
 
+config KERNEL_LZO
+        bool "LZO"
+        depends on HAVE_KERNEL_LZO
+        help
+          Its compression ratio is the poorest among the 4. The kernel
+          size is about about 10% bigger than gzip; however its speed
+          (both compression and decompression) is the fastest.
+
 endchoice
 
 config SWAP
@@ -334,6 +344,15 @@ config TREE_PREEMPT_RCU
           is also required.  It also scales down nicely to
           smaller systems.
 
+config TINY_RCU
+        bool "UP-only small-memory-footprint RCU"
+        depends on !SMP
+        help
+          This option selects the RCU implementation that is
+          designed for UP systems from which real-time response
+          is not required.  This option greatly reduces the
+          memory footprint of RCU.
+
 endchoice
 
 config RCU_TRACE
@@ -377,6 +396,22 @@ config RCU_FANOUT_EXACT
 
           Say N if unsure.
 
+config RCU_FAST_NO_HZ
+        bool "Accelerate last non-dyntick-idle CPU's grace periods"
+        depends on TREE_RCU && NO_HZ && SMP
+        default n
+        help
+          This option causes RCU to attempt to accelerate grace periods
+          in order to allow the final CPU to enter dynticks-idle state
+          more quickly.  On the other hand, this option increases the
+          overhead of the dynticks-idle checking, particularly on systems
+          with large numbers of CPUs.
+
+          Say Y if energy efficiency is critically important, particularly
+                if you have relatively few CPUs.
+
+          Say N if you are unsure.
+
 config TREE_RCU_TRACE
         def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU )
         select DEBUG_FS
@@ -426,59 +461,9 @@ config LOG_BUF_SHIFT
 config HAVE_UNSTABLE_SCHED_CLOCK
         bool
 
-config GROUP_SCHED
-        bool "Group CPU scheduler"
-        depends on EXPERIMENTAL
-        default n
-        help
-          This feature lets CPU scheduler recognize task groups and control CPU
-          bandwidth allocation to such task groups.
-          In order to create a group from arbitrary set of processes, use
-          CONFIG_CGROUPS. (See Control Group support.)
-
-config FAIR_GROUP_SCHED
-        bool "Group scheduling for SCHED_OTHER"
-        depends on GROUP_SCHED
-        default GROUP_SCHED
-
-config RT_GROUP_SCHED
-        bool "Group scheduling for SCHED_RR/FIFO"
-        depends on EXPERIMENTAL
-        depends on GROUP_SCHED
-        default n
-        help
-          This feature lets you explicitly allocate real CPU bandwidth
-          to users or control groups (depending on the "Basis for grouping tasks"
-          setting below. If enabled, it will also make it impossible to
-          schedule realtime tasks for non-root users until you allocate
-          realtime bandwidth for them.
-          See Documentation/scheduler/sched-rt-group.txt for more information.
-
-choice
-        depends on GROUP_SCHED
-        prompt "Basis for grouping tasks"
-        default USER_SCHED
-
-config USER_SCHED
-        bool "user id"
-        help
-          This option will choose userid as the basis for grouping
-          tasks, thus providing equal CPU bandwidth to each user.
-
-config CGROUP_SCHED
-        bool "Control groups"
-        depends on CGROUPS
-        help
-          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/cgroups.txt for more
-          information on "cgroup" pseudo filesystem.
-
-endchoice
-
 menuconfig CGROUPS
         boolean "Control Group support"
+        depends on EVENTFD
         help
           This option adds support for grouping sets of processes together, for
           use with process control subsystems such as Cpusets, CFS, memory
@@ -597,6 +582,36 @@ config CGROUP_MEM_RES_CTLR_SWAP
           Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
           size is 4096bytes, 512k per 1Gbytes of swap.
 
+menuconfig CGROUP_SCHED
+        bool "Group CPU scheduler"
+        depends on EXPERIMENTAL && CGROUPS
+        default n
+        help
+          This feature lets CPU scheduler recognize task groups and control CPU
+          bandwidth allocation to such task groups. It uses cgroups to group
+          tasks.
+
+if CGROUP_SCHED
+config FAIR_GROUP_SCHED
+        bool "Group scheduling for SCHED_OTHER"
+        depends on CGROUP_SCHED
+        default CGROUP_SCHED
+
+config RT_GROUP_SCHED
+        bool "Group scheduling for SCHED_RR/FIFO"
+        depends on EXPERIMENTAL
+        depends on CGROUP_SCHED
+        default n
+        help
+          This feature lets you explicitly allocate real CPU bandwidth
+          to users or control groups (depending on the "Basis for grouping tasks"
+          setting below. If enabled, it will also make it impossible to
+          schedule realtime tasks for non-root users until you allocate
+          realtime bandwidth for them.
+          See Documentation/scheduler/sched-rt-group.txt for more information.
+
+endif #CGROUP_SCHED
+
 endif # CGROUPS
 
 config MM_OWNER
@@ -606,7 +621,7 @@ config SYSFS_DEPRECATED
         bool
 
 config SYSFS_DEPRECATED_V2
-        bool "enable deprecated sysfs features which may confuse old userspace tools"
+        bool "enable deprecated sysfs features to support old userspace tools"
         depends on SYSFS
         default n
         select SYSFS_DEPRECATED
@@ -754,6 +769,7 @@ config UID16
 
 config SYSCTL_SYSCALL
         bool "Sysctl syscall support" if EMBEDDED
+        depends on PROC_SYSCTL
         default y
         select SYSCTL
         ---help---
@@ -956,19 +972,6 @@ config PERF_EVENTS
 
           Say Y if unsure.
 
-config EVENT_PROFILE
-        bool "Tracepoint profiling sources"
-        depends on PERF_EVENTS && EVENT_TRACING
-        default y
-        help
-         Allow the use of tracepoints as software performance events.
-
-         When this is enabled, you can create perf events based on
-         tracepoints using PERF_TYPE_TRACEPOINT and the tracepoint ID
-         found in debugfs://tracing/events/*/*/id. (The -e/--events
-         option to the perf tool can parse and interpret symbolic
-         tracepoints, in the subsystem:tracepoint_name format.)
-
 config PERF_COUNTERS
         bool "Kernel performance counters (old config option)"
         depends on HAVE_PERF_EVENTS
@@ -1069,8 +1072,30 @@ config SLOB
 
 endchoice
 
+config MMAP_ALLOW_UNINITIALIZED
+        bool "Allow mmapped anonymous memory to be uninitialized"
+        depends on EMBEDDED && !MMU
+        default n
+        help
+          Normally, and according to the Linux spec, anonymous memory obtained
+          from mmap() has it's contents cleared before it is passed to
+          userspace.  Enabling this config option allows you to request that
+          mmap() skip that if it is given an MAP_UNINITIALIZED flag, thus
+          providing a huge performance boost.  If this option is not enabled,
+          then the flag will be ignored.
+
+          This is taken advantage of by uClibc's malloc(), and also by
+          ELF-FDPIC binfmt's brk and stack allocator.
+
+          Because of the obvious security issues, this option should only be
+          enabled on embedded devices where you control what is run in
+          userspace.  Since that isn't generally a problem on no-MMU systems,
+          it is normally safe to say Y here.
+
+          See Documentation/nommu-mmap.txt for more information.
+
 config PROFILING
-        bool "Profiling support (EXPERIMENTAL)"
+        bool "Profiling support"
         help
           Say Y here to enable the extended profiling support mechanisms used
           by profilers such as OProfile.
@@ -1220,3 +1245,8 @@ source "block/Kconfig"
 config PREEMPT_NOTIFIERS
         bool
 
+config PADATA
+        depends on SMP
+        bool
+
+source "kernel/Kconfig.locks"
diff --git a/init/Makefile b/init/Makefile
index 4a243df426f7..0bf677aa0872 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -15,12 +15,8 @@ mounts-$(CONFIG_BLK_DEV_RAM)	+= do_mounts_rd.o
 mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
 mounts-$(CONFIG_BLK_DEV_MD)     += do_mounts_md.o
 
-# files to be removed upon make clean
-clean-files := ../include/linux/compile.h
-
 # dependencies on generated files need to be listed explicitly
-
-$(obj)/version.o: include/linux/compile.h
+$(obj)/version.o: include/generated/compile.h
 
 # compile.h changes depending on hostname, generation number, etc,
 # so we regenerate it always.
@@ -30,7 +26,7 @@ $(obj)/version.o: include/linux/compile.h
        chk_compile.h = :
  quiet_chk_compile.h = echo '  CHK     $@'
 silent_chk_compile.h = :
-include/linux/compile.h: FORCE
+include/generated/compile.h: FORCE
         @$($(quiet)chk_compile.h)
         $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
         "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"
diff --git a/init/calibrate.c b/init/calibrate.c
index a379c9061199..6eb48e53d61c 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -123,23 +123,26 @@ void __cpuinit calibrate_delay(void)
 {
         unsigned long ticks, loopbit;
         int lps_precision = LPS_PREC;
+        static bool printed;
 
         if (preset_lpj) {
                 loops_per_jiffy = preset_lpj;
-                printk(KERN_INFO
-                        "Calibrating delay loop (skipped) preset value.. ");
-        } else if ((smp_processor_id() == 0) && lpj_fine) {
+                if (!printed)
+                        pr_info("Calibrating delay loop (skipped) "
+                                "preset value.. ");
+        } else if ((!printed) && lpj_fine) {
                 loops_per_jiffy = lpj_fine;
-                printk(KERN_INFO
-                        "Calibrating delay loop (skipped), "
+                pr_info("Calibrating delay loop (skipped), "
                         "value calculated using timer frequency.. ");
         } else if ((loops_per_jiffy = calibrate_delay_direct()) != 0) {
-                printk(KERN_INFO
-                        "Calibrating delay using timer specific routine.. ");
+                if (!printed)
+                        pr_info("Calibrating delay using timer "
+                                "specific routine.. ");
         } else {
                 loops_per_jiffy = (1<<12);
 
-                printk(KERN_INFO "Calibrating delay loop... ");
+                if (!printed)
+                        pr_info("Calibrating delay loop... ");
                 while ((loops_per_jiffy <<= 1) != 0) {
                         /* wait for "start of" clock tick */
                         ticks = jiffies;
@@ -170,7 +173,10 @@ void __cpuinit calibrate_delay(void)
                                 loops_per_jiffy &= ~loopbit;
                 }
         }
-        printk(KERN_CONT "%lu.%02lu BogoMIPS (lpj=%lu)\n",
+        if (!printed)
+                pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
                         loops_per_jiffy/(500000/HZ),
                         (loops_per_jiffy/(5000/HZ)) % 100, loops_per_jiffy);
+
+        printed = true;
 }
diff --git a/init/do_mounts.c b/init/do_mounts.c
index bb008d064c1a..02e3ca4fc527 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -15,6 +15,7 @@
 #include <linux/initrd.h>
 #include <linux/async.h>
 #include <linux/fs_struct.h>
+#include <linux/slab.h>
 
 #include <linux/nfs_fs.h>
 #include <linux/nfs_fs_sb.h>
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index 614241b5200c..2b108538d0d9 100644
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -30,11 +30,7 @@ static int __init do_linuxrc(void * shell)
         extern char * envp_init[];
 
         sys_close(old_fd);sys_close(root_fd);
-        sys_close(0);sys_close(1);sys_close(2);
         sys_setsid();
-        (void) sys_open("/dev/console",O_RDWR,0);
-        (void) sys_dup(0);
-        (void) sys_dup(0);
         return kernel_execve(shell, argv, envp_init);
 }
 
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index 027a402708de..bf3ef667bf36 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -7,6 +7,7 @@
 #include <linux/cramfs_fs.h>
 #include <linux/initrd.h>
 #include <linux/string.h>
+#include <linux/slab.h>
 
 #include "do_mounts.h"
 #include "../fs/squashfs/squashfs_fs.h"
diff --git a/init/initramfs.c b/init/initramfs.c
index 4c00edc59689..4b9c20205092 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -413,7 +413,7 @@ static unsigned my_inptr;   /* index of next byte to be processed in inbuf */
 
 static char * __init unpack_to_rootfs(char *buf, unsigned len)
 {
-        int written;
+        int written, res;
         decompress_fn decompress;
         const char *compress_name;
         static __initdata char msg_buf[64];
@@ -445,17 +445,20 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len)
                 }
                 this_header = 0;
                 decompress = decompress_method(buf, len, &compress_name);
-                if (decompress)
-                        decompress(buf, len, NULL, flush_buffer, NULL,
+                if (decompress) {
+                        res = decompress(buf, len, NULL, flush_buffer, NULL,
                                    &my_inptr, error);
-                else if (compress_name) {
+                        if (res)
+                                error("decompressor failed");
+                } else if (compress_name) {
                         if (!message) {
                                 snprintf(msg_buf, sizeof msg_buf,
                                          "compression method %s not configured",
                                          compress_name);
                                 message = msg_buf;
                         }
-                }
+                } else
+                        error("junk in compressed archive");
                 if (state != Reset)
                         error("junk in compressed archive");
                 this_header = saved_offset + my_inptr;
@@ -523,7 +526,7 @@ static void __init clean_rootfs(void)
         int fd;
         void *buf;
         struct linux_dirent64 *dirp;
-        int count;
+        int num;
 
         fd = sys_open("/", O_RDONLY, 0);
         WARN_ON(fd < 0);
@@ -537,9 +540,9 @@ static void __init clean_rootfs(void)
         }
 
         dirp = buf;
-        count = sys_getdents64(fd, dirp, BUF_SIZE);
-        while (count > 0) {
-                while (count > 0) {
+        num = sys_getdents64(fd, dirp, BUF_SIZE);
+        while (num > 0) {
+                while (num > 0) {
                         struct stat st;
                         int ret;
 
@@ -552,12 +555,12 @@ static void __init clean_rootfs(void)
                                         sys_unlink(dirp->d_name);
                         }
 
-                        count -= dirp->d_reclen;
+                        num -= dirp->d_reclen;
                         dirp = (void *)dirp + dirp->d_reclen;
                 }
                 dirp = buf;
                 memset(buf, 0, BUF_SIZE);
-                count = sys_getdents64(fd, dirp, BUF_SIZE);
+                num = sys_getdents64(fd, dirp, BUF_SIZE);
         }
 
         sys_close(fd);
diff --git a/init/main.c b/init/main.c
index 4051d75dd2d6..5c8540271529 100644
--- a/init/main.c
+++ b/init/main.c
@@ -25,7 +25,6 @@
 #include <linux/bootmem.h>
 #include <linux/acpi.h>
 #include <linux/tty.h>
-#include <linux/gfp.h>
 #include <linux/percpu.h>
 #include <linux/kmod.h>
 #include <linux/vmalloc.h>
@@ -69,6 +68,7 @@
 #include <linux/kmemtrace.h>
 #include <linux/sfi.h>
 #include <linux/shmem_fs.h>
+#include <linux/slab.h>
 #include <trace/boot.h>
 
 #include <asm/io.h>
@@ -149,6 +149,20 @@ static int __init nosmp(char *str)
 
 early_param("nosmp", nosmp);
 
+/* this is hard limit */
+static int __init nrcpus(char *str)
+{
+        int nr_cpus;
+
+        get_option(&str, &nr_cpus);
+        if (nr_cpus > 0 && nr_cpus < nr_cpu_ids)
+                nr_cpu_ids = nr_cpus;
+
+        return 0;
+}
+
+early_param("nr_cpus", nrcpus);
+
 static int __init maxcpus(char *str)
 {
         get_option(&str, &setup_max_cpus);
@@ -160,7 +174,7 @@ static int __init maxcpus(char *str)
 
 early_param("maxcpus", maxcpus);
 #else
-const unsigned int setup_max_cpus = NR_CPUS;
+static const unsigned int setup_max_cpus = NR_CPUS;
 #endif
 
 /*
@@ -369,12 +383,6 @@ static void __init smp_init(void)
 {
         unsigned int cpu;
 
-        /*
-         * Set up the current CPU as possible to migrate to.
-         * The other ones will be done by cpu_up/cpu_down()
-         */
-        set_cpu_active(smp_processor_id(), true);
-
         /* FIXME: This should be done in userspace --RR */
         for_each_present_cpu(cpu) {
                 if (num_online_cpus() >= setup_max_cpus)
@@ -422,7 +430,9 @@ static noinline void __init_refok rest_init(void)
         kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
         numa_default_policy();
         pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
+        rcu_read_lock();
         kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
+        rcu_read_unlock();
         unlock_kernel();
 
         /*
@@ -486,6 +496,7 @@ static void __init boot_cpu_init(void)
         int cpu = smp_processor_id();
         /* Mark the boot cpu "present", "online" etc for SMP and UP case */
         set_cpu_online(cpu, true);
+        set_cpu_active(cpu, true);
         set_cpu_present(cpu, true);
         set_cpu_possible(cpu, true);
 }
@@ -589,6 +600,7 @@ asmlinkage void __init start_kernel(void)
                 local_irq_disable();
         }
         rcu_init();
+        radix_tree_init();
         /* init some links before init_ISA_irqs() */
         early_irq_init();
         init_IRQ();
@@ -606,7 +618,7 @@ asmlinkage void __init start_kernel(void)
         local_irq_enable();
 
         /* Interrupts are enabled now so all GFP allocations are safe. */
-        set_gfp_allowed_mask(__GFP_BITS_MASK);
+        gfp_allowed_mask = __GFP_BITS_MASK;
 
         kmem_cache_init_late();
 
@@ -664,7 +676,6 @@ asmlinkage void __init start_kernel(void)
         key_init();
         security_init();
         vfs_caches_init(totalram_pages);
-        radix_tree_init();
         signals_init();
         /* rootfs populating might need page-writeback */
         page_writeback_init();
@@ -691,10 +702,10 @@ asmlinkage void __init start_kernel(void)
 static void __init do_ctors(void)
 {
 #ifdef CONFIG_CONSTRUCTORS
-        ctor_fn_t *call = (ctor_fn_t *) __ctors_start;
+        ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
 
-        for (; call < (ctor_fn_t *) __ctors_end; call++)
-                (*call)();
+        for (; fn < (ctor_fn_t *) __ctors_end; fn++)
+                (*fn)();
 #endif
 }
 
@@ -755,10 +766,10 @@ extern initcall_t __initcall_start[], __initcall_end[], __early_initcall_end[];
 
 static void __init do_initcalls(void)
 {
-        initcall_t *call;
+        initcall_t *fn;
 
-        for (call = __early_initcall_end; call < __initcall_end; call++)
-                do_one_initcall(*call);
+        for (fn = __early_initcall_end; fn < __initcall_end; fn++)
+                do_one_initcall(*fn);
 
         /* Make sure there is no pending stuff from the initcall sequence */
         flush_scheduled_work();
@@ -785,10 +796,10 @@ static void __init do_basic_setup(void)
 
 static void __init do_pre_smp_initcalls(void)
 {
-        initcall_t *call;
+        initcall_t *fn;
 
-        for (call = __initcall_start; call < __early_initcall_end; call++)
-                do_one_initcall(*call);
+        for (fn = __initcall_start; fn < __early_initcall_end; fn++)
+                do_one_initcall(*fn);
 }
 
 static void run_init_process(char *init_filename)
@@ -811,11 +822,6 @@ static noinline int init_post(void)
         system_state = SYSTEM_RUNNING;
         numa_default_policy();
 
-        if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
-                printk(KERN_WARNING "Warning: unable to open an initial console.\n");
-
-        (void) sys_dup(0);
-        (void) sys_dup(0);
 
         current->signal->flags |= SIGNAL_UNKILLABLE;
 
@@ -841,7 +847,8 @@ static noinline int init_post(void)
         run_init_process("/bin/init");
         run_init_process("/bin/sh");
 
-        panic("No init found.  Try passing init= option to kernel.");
+        panic("No init found.  Try passing init= option to kernel. "
+              "See Linux Documentation/init.txt for guidance.");
 }
 
 static int __init kernel_init(void * unused)
@@ -851,7 +858,7 @@ static int __init kernel_init(void * unused)
         /*
          * init can allocate pages on any node
          */
-        set_mems_allowed(node_possible_map);
+        set_mems_allowed(node_states[N_HIGH_MEMORY]);
         /*
          * init can run on any cpu.
          */
@@ -878,6 +885,12 @@ static int __init kernel_init(void * unused)
 
         do_basic_setup();
 
+        /* Open the /dev/console on the rootfs, this should never fail */
+        if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
+                printk(KERN_WARNING "Warning: unable to open an initial console.\n");
+
+        (void) sys_dup(0);
+        (void) sys_dup(0);
         /*
          * check if there is an early userspace init.  If yes, let it do all
          * the work
diff --git a/init/version.c b/init/version.c
index 52a8b98642b8..adff586401a5 100644
--- a/init/version.c
+++ b/init/version.c
@@ -6,11 +6,11 @@
  *  May be freely distributed as part of Linux.
  */
 
-#include <linux/compile.h>
+#include <generated/compile.h>
 #include <linux/module.h>
 #include <linux/uts.h>
 #include <linux/utsname.h>
-#include <linux/utsrelease.h>
+#include <generated/utsrelease.h>
 #include <linux/version.h>
 
 #ifndef CONFIG_KALLSYMS