3 files changed, 91 insertions, 7 deletions

diff --git a/init/Kconfig b/init/Kconfig
index dd43d8e22980..4f6cdbf523eb 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -130,13 +130,16 @@ config HAVE_KERNEL_BZIP2
 config HAVE_KERNEL_LZMA
         bool
 
+config HAVE_KERNEL_XZ
+        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 || HAVE_KERNEL_LZO
+        depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO
         help
           The linux kernel is a kind of self-extracting executable.
           Several compression algorithms are available, which differ
@@ -181,6 +184,21 @@ config KERNEL_LZMA
           two. Compression is slowest.  The kernel size is about 33%
           smaller with LZMA in comparison to gzip.
 
+config KERNEL_XZ
+        bool "XZ"
+        depends on HAVE_KERNEL_XZ
+        help
+          XZ uses the LZMA2 algorithm and instruction set specific
+          BCJ filters which can improve compression ratio of executable
+          code. The size of the kernel is about 30% smaller with XZ in
+          comparison to gzip. On architectures for which there is a BCJ
+          filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ
+          will create a few percent smaller kernel than plain LZMA.
+
+          The speed is about the same as with LZMA: The decompression
+          speed of XZ is better than that of bzip2 but worse than gzip
+          and LZO. Compression is slow.
+
 config KERNEL_LZO
         bool "LZO"
         depends on HAVE_KERNEL_LZO
@@ -393,7 +411,6 @@ config PREEMPT_RCU
 
 config RCU_TRACE
         bool "Enable tracing for RCU"
-        depends on TREE_RCU || TREE_PREEMPT_RCU
         help
           This option provides tracing in RCU which presents stats
           in debugfs for debugging RCU implementation.
@@ -459,6 +476,60 @@ config TREE_RCU_TRACE
           TREE_PREEMPT_RCU implementations, permitting Makefile to
           trivially select kernel/rcutree_trace.c.
 
+config RCU_BOOST
+        bool "Enable RCU priority boosting"
+        depends on RT_MUTEXES && TINY_PREEMPT_RCU
+        default n
+        help
+          This option boosts the priority of preempted RCU readers that
+          block the current preemptible RCU grace period for too long.
+          This option also prevents heavy loads from blocking RCU
+          callback invocation for all flavors of RCU.
+
+          Say Y here if you are working with real-time apps or heavy loads
+          Say N here if you are unsure.
+
+config RCU_BOOST_PRIO
+        int "Real-time priority to boost RCU readers to"
+        range 1 99
+        depends on RCU_BOOST
+        default 1
+        help
+          This option specifies the real-time priority to which preempted
+          RCU readers are to be boosted.  If you are working with CPU-bound
+          real-time applications, you should specify a priority higher then
+          the highest-priority CPU-bound application.
+
+          Specify the real-time priority, or take the default if unsure.
+
+config RCU_BOOST_DELAY
+        int "Milliseconds to delay boosting after RCU grace-period start"
+        range 0 3000
+        depends on RCU_BOOST
+        default 500
+        help
+          This option specifies the time to wait after the beginning of
+          a given grace period before priority-boosting preempted RCU
+          readers blocking that grace period.  Note that any RCU reader
+          blocking an expedited RCU grace period is boosted immediately.
+
+          Accept the default if unsure.
+
+config SRCU_SYNCHRONIZE_DELAY
+        int "Microseconds to delay before waiting for readers"
+        range 0 20
+        default 10
+        help
+          This option controls how long SRCU delays before entering its
+          loop waiting on SRCU readers.  The purpose of this loop is
+          to avoid the unconditional context-switch penalty that would
+          otherwise be incurred if there was an active SRCU reader,
+          in a manner similar to adaptive locking schemes.  This should
+          be set to be a bit longer than the common-case SRCU read-side
+          critical-section overhead.
+
+          Accept the default if unsure.
+
 endmenu # "RCU Subsystem"
 
 config IKCONFIG
@@ -741,6 +812,19 @@ config NET_NS
 
 endif # NAMESPACES
 
+config SCHED_AUTOGROUP
+        bool "Automatic process group scheduling"
+        select EVENTFD
+        select CGROUPS
+        select CGROUP_SCHED
+        select FAIR_GROUP_SCHED
+        help
+          This option optimizes the scheduler for common desktop workloads by
+          automatically creating and populating task groups.  This separation
+          of workloads isolates aggressive CPU burners (like build jobs) from
+          desktop applications.  Task group autogeneration is currently based
+          upon task session.
+
 config MM_OWNER
         bool
 
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 830aaec9c7d5..2b54bef33b55 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -93,7 +93,7 @@ no_match:
  *
  * Returns the matching dev_t on success or 0 on failure.
  */
-static dev_t __init devt_from_partuuid(char *uuid_str)
+static dev_t devt_from_partuuid(char *uuid_str)
 {
         dev_t res = 0;
         struct device *dev = NULL;
diff --git a/init/main.c b/init/main.c
index 8646401f7a0e..00799c1d4628 100644
--- a/init/main.c
+++ b/init/main.c
@@ -67,6 +67,7 @@
 #include <linux/sfi.h>
 #include <linux/shmem_fs.h>
 #include <linux/slab.h>
+#include <linux/perf_event.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -603,6 +604,8 @@ asmlinkage void __init start_kernel(void)
                                 "enabled *very* early, fixing it\n");
                 local_irq_disable();
         }
+        idr_init_cache();
+        perf_event_init();
         rcu_init();
         radix_tree_init();
         /* init some links before init_ISA_irqs() */
@@ -658,7 +661,6 @@ asmlinkage void __init start_kernel(void)
         enable_debug_pagealloc();
         kmemleak_init();
         debug_objects_mem_init();
-        idr_init_cache();
         setup_per_cpu_pageset();
         numa_policy_init();
         if (late_time_init)
@@ -775,9 +777,6 @@ static void __init do_initcalls(void)
 
         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();
 }
 
 /*
@@ -882,6 +881,7 @@ static int __init kernel_init(void * unused)
         smp_prepare_cpus(setup_max_cpus);
 
         do_pre_smp_initcalls();
+        lockup_detector_init();
 
         smp_init();
         sched_init_smp();