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-rw-r--r--init/Kconfig60
-rw-r--r--init/calibrate.c102
-rw-r--r--init/do_mounts.c5
-rw-r--r--init/do_mounts_rd.c2
-rw-r--r--init/main.c101
-rw-r--r--init/version.c1
6 files changed, 115 insertions, 156 deletions
diff --git a/init/Kconfig b/init/Kconfig
index be788c0957d4..4986ecc49e65 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -69,11 +69,6 @@ config BROKEN_ON_SMP
depends on BROKEN || !SMP
default y
-config LOCK_KERNEL
- bool
- depends on (SMP || PREEMPT) && BKL
- default y
-
config INIT_ENV_ARG_LIMIT
int
default 32 if !UML
@@ -287,6 +282,18 @@ config BSD_PROCESS_ACCT_V3
for processing it. A preliminary version of these tools is available
at <http://www.gnu.org/software/acct/>.
+config FHANDLE
+ bool "open by fhandle syscalls"
+ select EXPORTFS
+ help
+ If you say Y here, a user level program will be able to map
+ file names to handle and then later use the handle for
+ different file system operations. This is useful in implementing
+ userspace file servers, which now track files using handles instead
+ of names. The handle would remain the same even if file names
+ get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2)
+ syscalls.
+
config TASKSTATS
bool "Export task/process statistics through netlink (EXPERIMENTAL)"
depends on NET
@@ -478,7 +485,7 @@ config TREE_RCU_TRACE
config RCU_BOOST
bool "Enable RCU priority boosting"
- depends on RT_MUTEXES && TINY_PREEMPT_RCU
+ depends on RT_MUTEXES && PREEMPT_RCU
default n
help
This option boosts the priority of preempted RCU readers that
@@ -683,6 +690,16 @@ config CGROUP_MEM_RES_CTLR_SWAP_ENABLED
select this option (if, for some reason, they need to disable it
then noswapaccount does the trick).
+config CGROUP_PERF
+ bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
+ depends on PERF_EVENTS && CGROUPS
+ help
+ This option extends the per-cpu mode to restrict monitoring to
+ threads which belong to the cgroup specified and run on the
+ designated cpu.
+
+ Say N if unsure.
+
menuconfig CGROUP_SCHED
bool "Group CPU scheduler"
depends on EXPERIMENTAL
@@ -728,9 +745,9 @@ config BLK_CGROUP
This option only enables generic Block IO controller infrastructure.
One needs to also enable actual IO controlling logic/policy. For
- enabling proportional weight division of disk bandwidth in CFQ seti
- CONFIG_CFQ_GROUP_IOSCHED=y and for enabling throttling policy set
- CONFIG_BLK_THROTTLE=y.
+ enabling proportional weight division of disk bandwidth in CFQ, set
+ CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
+ CONFIG_BLK_DEV_THROTTLING=y.
See Documentation/cgroups/blkio-controller.txt for more information.
@@ -810,11 +827,16 @@ config SCHED_AUTOGROUP
desktop applications. Task group autogeneration is currently based
upon task session.
+config SCHED_TTWU_QUEUE
+ bool
+ depends on !SPARC32
+ default y
+
config MM_OWNER
bool
config SYSFS_DEPRECATED
- bool "enable deprecated sysfs features to support old userspace tools"
+ bool "Enable deprecated sysfs features to support old userspace tools"
depends on SYSFS
default n
help
@@ -837,7 +859,7 @@ config SYSFS_DEPRECATED
need to say Y here.
config SYSFS_DEPRECATED_V2
- bool "enabled deprecated sysfs features by default"
+ bool "Enable deprecated sysfs features by default"
default n
depends on SYSFS
depends on SYSFS_DEPRECATED
@@ -907,14 +929,6 @@ menuconfig EXPERT
environments which can tolerate a "non-standard" kernel.
Only use this if you really know what you are doing.
-config EMBEDDED
- bool "Embedded system"
- select EXPERT
- help
- This option should be enabled if compiling the kernel for
- an embedded system so certain expert options are available
- for configuration.
-
config UID16
bool "Enable 16-bit UID system calls" if EXPERT
depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
@@ -1087,6 +1101,14 @@ config AIO
by some high performance threaded applications. Disabling
this option saves about 7k.
+config EMBEDDED
+ bool "Embedded system"
+ select EXPERT
+ help
+ This option should be enabled if compiling the kernel for
+ an embedded system so certain expert options are available
+ for configuration.
+
config HAVE_PERF_EVENTS
bool
help
diff --git a/init/calibrate.c b/init/calibrate.c
index 24fe022c55f9..76ac9194cbc4 100644
--- a/init/calibrate.c
+++ b/init/calibrate.c
@@ -110,8 +110,8 @@ static unsigned long __cpuinit calibrate_delay_direct(void) {return 0;}
/*
* This is the number of bits of precision for the loops_per_jiffy. Each
- * bit takes on average 1.5/HZ seconds. This (like the original) is a little
- * better than 1%
+ * time we refine our estimate after the first takes 1.5/HZ seconds, so try
+ * to start with a good estimate.
* For the boot cpu we can skip the delay calibration and assign it a value
* calculated based on the timer frequency.
* For the rest of the CPUs we cannot assume that the timer frequency is same as
@@ -119,10 +119,72 @@ static unsigned long __cpuinit calibrate_delay_direct(void) {return 0;}
*/
#define LPS_PREC 8
+static unsigned long __cpuinit calibrate_delay_converge(void)
+{
+ /* First stage - slowly accelerate to find initial bounds */
+ unsigned long lpj, lpj_base, ticks, loopadd, loopadd_base, chop_limit;
+ int trials = 0, band = 0, trial_in_band = 0;
+
+ lpj = (1<<12);
+
+ /* wait for "start of" clock tick */
+ ticks = jiffies;
+ while (ticks == jiffies)
+ ; /* nothing */
+ /* Go .. */
+ ticks = jiffies;
+ do {
+ if (++trial_in_band == (1<<band)) {
+ ++band;
+ trial_in_band = 0;
+ }
+ __delay(lpj * band);
+ trials += band;
+ } while (ticks == jiffies);
+ /*
+ * We overshot, so retreat to a clear underestimate. Then estimate
+ * the largest likely undershoot. This defines our chop bounds.
+ */
+ trials -= band;
+ loopadd_base = lpj * band;
+ lpj_base = lpj * trials;
+
+recalibrate:
+ lpj = lpj_base;
+ loopadd = loopadd_base;
+
+ /*
+ * Do a binary approximation to get lpj set to
+ * equal one clock (up to LPS_PREC bits)
+ */
+ chop_limit = lpj >> LPS_PREC;
+ while (loopadd > chop_limit) {
+ lpj += loopadd;
+ ticks = jiffies;
+ while (ticks == jiffies)
+ ; /* nothing */
+ ticks = jiffies;
+ __delay(lpj);
+ if (jiffies != ticks) /* longer than 1 tick */
+ lpj -= loopadd;
+ loopadd >>= 1;
+ }
+ /*
+ * If we incremented every single time possible, presume we've
+ * massively underestimated initially, and retry with a higher
+ * start, and larger range. (Only seen on x86_64, due to SMIs)
+ */
+ if (lpj + loopadd * 2 == lpj_base + loopadd_base * 2) {
+ lpj_base = lpj;
+ loopadd_base <<= 2;
+ goto recalibrate;
+ }
+
+ return lpj;
+}
+
void __cpuinit calibrate_delay(void)
{
- unsigned long ticks, loopbit;
- int lps_precision = LPS_PREC;
static bool printed;
if (preset_lpj) {
@@ -139,39 +201,9 @@ void __cpuinit calibrate_delay(void)
pr_info("Calibrating delay using timer "
"specific routine.. ");
} else {
- loops_per_jiffy = (1<<12);
-
if (!printed)
pr_info("Calibrating delay loop... ");
- while ((loops_per_jiffy <<= 1) != 0) {
- /* wait for "start of" clock tick */
- ticks = jiffies;
- while (ticks == jiffies)
- /* nothing */;
- /* Go .. */
- ticks = jiffies;
- __delay(loops_per_jiffy);
- ticks = jiffies - ticks;
- if (ticks)
- break;
- }
-
- /*
- * Do a binary approximation to get loops_per_jiffy set to
- * equal one clock (up to lps_precision bits)
- */
- loops_per_jiffy >>= 1;
- loopbit = loops_per_jiffy;
- while (lps_precision-- && (loopbit >>= 1)) {
- loops_per_jiffy |= loopbit;
- ticks = jiffies;
- while (ticks == jiffies)
- /* nothing */;
- ticks = jiffies;
- __delay(loops_per_jiffy);
- if (jiffies != ticks) /* longer than 1 tick */
- loops_per_jiffy &= ~loopbit;
- }
+ loops_per_jiffy = calibrate_delay_converge();
}
if (!printed)
pr_cont("%lu.%02lu BogoMIPS (lpj=%lu)\n",
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 2b54bef33b55..c0851a8e030c 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -186,7 +186,7 @@ dev_t name_to_dev_t(char *name)
goto done;
/*
- * try non-existant, but valid partition, which may only exist
+ * try non-existent, but valid partition, which may only exist
* after revalidating the disk, like partitioned md devices
*/
while (p > s && isdigit(p[-1]))
@@ -293,7 +293,8 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
sys_chdir((const char __user __force *)"/root");
ROOT_DEV = current->fs->pwd.mnt->mnt_sb->s_dev;
- printk("VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
+ printk(KERN_INFO
+ "VFS: Mounted root (%s filesystem)%s on device %u:%u.\n",
current->fs->pwd.mnt->mnt_sb->s_type->name,
current->fs->pwd.mnt->mnt_sb->s_flags & MS_RDONLY ?
" readonly" : "", MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index 6e1ee6987c78..fe9acb0ae480 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -64,7 +64,7 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
buf = kmalloc(size, GFP_KERNEL);
if (!buf)
- return -1;
+ return -ENOMEM;
minixsb = (struct minix_super_block *) buf;
ext2sb = (struct ext2_super_block *) buf;
diff --git a/init/main.c b/init/main.c
index 33c37c379e96..48df882d51d2 100644
--- a/init/main.c
+++ b/init/main.c
@@ -129,63 +129,6 @@ static char *static_command_line;
static char *execute_command;
static char *ramdisk_execute_command;
-#ifdef CONFIG_SMP
-/* Setup configured maximum number of CPUs to activate */
-unsigned int setup_max_cpus = NR_CPUS;
-EXPORT_SYMBOL(setup_max_cpus);
-
-
-/*
- * Setup routine for controlling SMP activation
- *
- * Command-line option of "nosmp" or "maxcpus=0" will disable SMP
- * activation entirely (the MPS table probe still happens, though).
- *
- * Command-line option of "maxcpus=<NUM>", where <NUM> is an integer
- * greater than 0, limits the maximum number of CPUs activated in
- * SMP mode to <NUM>.
- */
-
-void __weak arch_disable_smp_support(void) { }
-
-static int __init nosmp(char *str)
-{
- setup_max_cpus = 0;
- arch_disable_smp_support();
-
- return 0;
-}
-
-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);
- if (setup_max_cpus == 0)
- arch_disable_smp_support();
-
- return 0;
-}
-
-early_param("maxcpus", maxcpus);
-#else
-static const unsigned int setup_max_cpus = NR_CPUS;
-#endif
-
/*
* If set, this is an indication to the drivers that reset the underlying
* device before going ahead with the initialization otherwise driver might
@@ -362,7 +305,7 @@ static int __init rdinit_setup(char *str)
__setup("rdinit=", rdinit_setup);
#ifndef CONFIG_SMP
-
+static const unsigned int setup_max_cpus = NR_CPUS;
#ifdef CONFIG_X86_LOCAL_APIC
static void __init smp_init(void)
{
@@ -374,37 +317,6 @@ static void __init smp_init(void)
static inline void setup_nr_cpu_ids(void) { }
static inline void smp_prepare_cpus(unsigned int maxcpus) { }
-
-#else
-
-/* Setup number of possible processor ids */
-int nr_cpu_ids __read_mostly = NR_CPUS;
-EXPORT_SYMBOL(nr_cpu_ids);
-
-/* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */
-static void __init setup_nr_cpu_ids(void)
-{
- nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
-}
-
-/* Called by boot processor to activate the rest. */
-static void __init smp_init(void)
-{
- unsigned int cpu;
-
- /* FIXME: This should be done in userspace --RR */
- for_each_present_cpu(cpu) {
- if (num_online_cpus() >= setup_max_cpus)
- break;
- if (!cpu_online(cpu))
- cpu_up(cpu);
- }
-
- /* Any cleanup work */
- printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
- smp_cpus_done(setup_max_cpus);
-}
-
#endif
/*
@@ -668,8 +580,8 @@ asmlinkage void __init start_kernel(void)
#endif
page_cgroup_init();
enable_debug_pagealloc();
- kmemleak_init();
debug_objects_mem_init();
+ kmemleak_init();
setup_per_cpu_pageset();
numa_policy_init();
if (late_time_init)
@@ -875,15 +787,6 @@ static int __init kernel_init(void * unused)
* init can run on any cpu.
*/
set_cpus_allowed_ptr(current, cpu_all_mask);
- /*
- * Tell the world that we're going to be the grim
- * reaper of innocent orphaned children.
- *
- * We don't want people to have to make incorrect
- * assumptions about where in the task array this
- * can be found.
- */
- init_pid_ns.child_reaper = current;
cad_pid = task_pid(current);
diff --git a/init/version.c b/init/version.c
index adff586401a5..86fe0ccb997a 100644
--- a/init/version.c
+++ b/init/version.c
@@ -33,6 +33,7 @@ struct uts_namespace init_uts_ns = {
.machine = UTS_MACHINE,
.domainname = UTS_DOMAINNAME,
},
+ .user_ns = &init_user_ns,
};
EXPORT_SYMBOL_GPL(init_uts_ns);