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-rw-r--r--kernel/audit.c6
-rw-r--r--kernel/auditfilter.c3
-rw-r--r--kernel/capability.c132
-rw-r--r--kernel/cpuset.c20
-rw-r--r--kernel/futex.c93
-rw-r--r--kernel/hrtimer.c8
-rw-r--r--kernel/kgdb.c19
-rw-r--r--kernel/kprobes.c15
-rw-r--r--kernel/rcuclassic.c16
-rw-r--r--kernel/rcupreempt.c2
-rw-r--r--kernel/sched.c74
-rw-r--r--kernel/sched_rt.c66
-rw-r--r--kernel/sched_stats.h6
-rw-r--r--kernel/softlockup.c16
-rw-r--r--kernel/workqueue.c2
15 files changed, 338 insertions, 140 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index e8692a5748c..e092f1c0ce3 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -738,7 +738,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (!audit_enabled && msg_type != AUDIT_USER_AVC)
return 0;
- err = audit_filter_user(&NETLINK_CB(skb), msg_type);
+ err = audit_filter_user(&NETLINK_CB(skb));
if (err == 1) {
err = 0;
if (msg_type == AUDIT_USER_TTY) {
@@ -779,7 +779,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
/* fallthrough */
case AUDIT_LIST:
- err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid,
+ err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
uid, seq, data, nlmsg_len(nlh),
loginuid, sessionid, sid);
break;
@@ -798,7 +798,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
}
/* fallthrough */
case AUDIT_LIST_RULES:
- err = audit_receive_filter(nlh->nlmsg_type, NETLINK_CB(skb).pid,
+ err = audit_receive_filter(msg_type, NETLINK_CB(skb).pid,
uid, seq, data, nlmsg_len(nlh),
loginuid, sessionid, sid);
break;
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 0e0bd27e651..98c50cc671b 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1544,6 +1544,7 @@ static void audit_log_rule_change(uid_t loginuid, u32 sessionid, u32 sid,
* @data: payload data
* @datasz: size of payload data
* @loginuid: loginuid of sender
+ * @sessionid: sessionid for netlink audit message
* @sid: SE Linux Security ID of sender
*/
int audit_receive_filter(int type, int pid, int uid, int seq, void *data,
@@ -1720,7 +1721,7 @@ static int audit_filter_user_rules(struct netlink_skb_parms *cb,
return 1;
}
-int audit_filter_user(struct netlink_skb_parms *cb, int type)
+int audit_filter_user(struct netlink_skb_parms *cb)
{
enum audit_state state = AUDIT_DISABLED;
struct audit_entry *e;
diff --git a/kernel/capability.c b/kernel/capability.c
index 39e8193b41e..901e0fdc3ff 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -53,11 +53,95 @@ static void warn_legacy_capability_use(void)
}
/*
+ * Version 2 capabilities worked fine, but the linux/capability.h file
+ * that accompanied their introduction encouraged their use without
+ * the necessary user-space source code changes. As such, we have
+ * created a version 3 with equivalent functionality to version 2, but
+ * with a header change to protect legacy source code from using
+ * version 2 when it wanted to use version 1. If your system has code
+ * that trips the following warning, it is using version 2 specific
+ * capabilities and may be doing so insecurely.
+ *
+ * The remedy is to either upgrade your version of libcap (to 2.10+,
+ * if the application is linked against it), or recompile your
+ * application with modern kernel headers and this warning will go
+ * away.
+ */
+
+static void warn_deprecated_v2(void)
+{
+ static int warned;
+
+ if (!warned) {
+ char name[sizeof(current->comm)];
+
+ printk(KERN_INFO "warning: `%s' uses deprecated v2"
+ " capabilities in a way that may be insecure.\n",
+ get_task_comm(name, current));
+ warned = 1;
+ }
+}
+
+/*
+ * Version check. Return the number of u32s in each capability flag
+ * array, or a negative value on error.
+ */
+static int cap_validate_magic(cap_user_header_t header, unsigned *tocopy)
+{
+ __u32 version;
+
+ if (get_user(version, &header->version))
+ return -EFAULT;
+
+ switch (version) {
+ case _LINUX_CAPABILITY_VERSION_1:
+ warn_legacy_capability_use();
+ *tocopy = _LINUX_CAPABILITY_U32S_1;
+ break;
+ case _LINUX_CAPABILITY_VERSION_2:
+ warn_deprecated_v2();
+ /*
+ * fall through - v3 is otherwise equivalent to v2.
+ */
+ case _LINUX_CAPABILITY_VERSION_3:
+ *tocopy = _LINUX_CAPABILITY_U32S_3;
+ break;
+ default:
+ if (put_user((u32)_KERNEL_CAPABILITY_VERSION, &header->version))
+ return -EFAULT;
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
* For sys_getproccap() and sys_setproccap(), any of the three
* capability set pointers may be NULL -- indicating that that set is
* uninteresting and/or not to be changed.
*/
+/*
+ * Atomically modify the effective capabilities returning the original
+ * value. No permission check is performed here - it is assumed that the
+ * caller is permitted to set the desired effective capabilities.
+ */
+kernel_cap_t cap_set_effective(const kernel_cap_t pE_new)
+{
+ kernel_cap_t pE_old;
+
+ spin_lock(&task_capability_lock);
+
+ pE_old = current->cap_effective;
+ current->cap_effective = pE_new;
+
+ spin_unlock(&task_capability_lock);
+
+ return pE_old;
+}
+
+EXPORT_SYMBOL(cap_set_effective);
+
/**
* sys_capget - get the capabilities of a given process.
* @header: pointer to struct that contains capability version and
@@ -71,27 +155,13 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
{
int ret = 0;
pid_t pid;
- __u32 version;
struct task_struct *target;
unsigned tocopy;
kernel_cap_t pE, pI, pP;
- if (get_user(version, &header->version))
- return -EFAULT;
-
- switch (version) {
- case _LINUX_CAPABILITY_VERSION_1:
- warn_legacy_capability_use();
- tocopy = _LINUX_CAPABILITY_U32S_1;
- break;
- case _LINUX_CAPABILITY_VERSION_2:
- tocopy = _LINUX_CAPABILITY_U32S_2;
- break;
- default:
- if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
- return -EFAULT;
- return -EINVAL;
- }
+ ret = cap_validate_magic(header, &tocopy);
+ if (ret != 0)
+ return ret;
if (get_user(pid, &header->pid))
return -EFAULT;
@@ -118,7 +188,7 @@ out:
spin_unlock(&task_capability_lock);
if (!ret) {
- struct __user_cap_data_struct kdata[_LINUX_CAPABILITY_U32S];
+ struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
unsigned i;
for (i = 0; i < tocopy; i++) {
@@ -128,7 +198,7 @@ out:
}
/*
- * Note, in the case, tocopy < _LINUX_CAPABILITY_U32S,
+ * Note, in the case, tocopy < _KERNEL_CAPABILITY_U32S,
* we silently drop the upper capabilities here. This
* has the effect of making older libcap
* implementations implicitly drop upper capability
@@ -240,30 +310,16 @@ static inline int cap_set_all(kernel_cap_t *effective,
*/
asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
{
- struct __user_cap_data_struct kdata[_LINUX_CAPABILITY_U32S];
+ struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
unsigned i, tocopy;
kernel_cap_t inheritable, permitted, effective;
- __u32 version;
struct task_struct *target;
int ret;
pid_t pid;
- if (get_user(version, &header->version))
- return -EFAULT;
-
- switch (version) {
- case _LINUX_CAPABILITY_VERSION_1:
- warn_legacy_capability_use();
- tocopy = _LINUX_CAPABILITY_U32S_1;
- break;
- case _LINUX_CAPABILITY_VERSION_2:
- tocopy = _LINUX_CAPABILITY_U32S_2;
- break;
- default:
- if (put_user(_LINUX_CAPABILITY_VERSION, &header->version))
- return -EFAULT;
- return -EINVAL;
- }
+ ret = cap_validate_magic(header, &tocopy);
+ if (ret != 0)
+ return ret;
if (get_user(pid, &header->pid))
return -EFAULT;
@@ -281,7 +337,7 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
permitted.cap[i] = kdata[i].permitted;
inheritable.cap[i] = kdata[i].inheritable;
}
- while (i < _LINUX_CAPABILITY_U32S) {
+ while (i < _KERNEL_CAPABILITY_U32S) {
effective.cap[i] = 0;
permitted.cap[i] = 0;
inheritable.cap[i] = 0;
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 86ea9e34e32..9fceb97e989 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -797,8 +797,10 @@ static int update_cpumask(struct cpuset *cs, char *buf)
retval = cpulist_parse(buf, trialcs.cpus_allowed);
if (retval < 0)
return retval;
+
+ if (!cpus_subset(trialcs.cpus_allowed, cpu_online_map))
+ return -EINVAL;
}
- cpus_and(trialcs.cpus_allowed, trialcs.cpus_allowed, cpu_online_map);
retval = validate_change(cs, &trialcs);
if (retval < 0)
return retval;
@@ -932,9 +934,11 @@ static int update_nodemask(struct cpuset *cs, char *buf)
retval = nodelist_parse(buf, trialcs.mems_allowed);
if (retval < 0)
goto done;
+
+ if (!nodes_subset(trialcs.mems_allowed,
+ node_states[N_HIGH_MEMORY]))
+ return -EINVAL;
}
- nodes_and(trialcs.mems_allowed, trialcs.mems_allowed,
- node_states[N_HIGH_MEMORY]);
oldmem = cs->mems_allowed;
if (nodes_equal(oldmem, trialcs.mems_allowed)) {
retval = 0; /* Too easy - nothing to do */
@@ -1033,8 +1037,8 @@ int current_cpuset_is_being_rebound(void)
static int update_relax_domain_level(struct cpuset *cs, s64 val)
{
- if ((int)val < 0)
- val = -1;
+ if (val < -1 || val >= SD_LV_MAX)
+ return -EINVAL;
if (val != cs->relax_domain_level) {
cs->relax_domain_level = val;
@@ -1886,6 +1890,12 @@ static void common_cpu_mem_hotplug_unplug(void)
top_cpuset.mems_allowed = node_states[N_HIGH_MEMORY];
scan_for_empty_cpusets(&top_cpuset);
+ /*
+ * Scheduler destroys domains on hotplug events.
+ * Rebuild them based on the current settings.
+ */
+ rebuild_sched_domains();
+
cgroup_unlock();
}
diff --git a/kernel/futex.c b/kernel/futex.c
index 449def8074f..7d1136e97c1 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -1096,21 +1096,64 @@ static void unqueue_me_pi(struct futex_q *q)
* private futexes.
*/
static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
- struct task_struct *newowner)
+ struct task_struct *newowner,
+ struct rw_semaphore *fshared)
{
u32 newtid = task_pid_vnr(newowner) | FUTEX_WAITERS;
struct futex_pi_state *pi_state = q->pi_state;
+ struct task_struct *oldowner = pi_state->owner;
u32 uval, curval, newval;
- int ret;
+ int ret, attempt = 0;
/* Owner died? */
+ if (!pi_state->owner)
+ newtid |= FUTEX_OWNER_DIED;
+
+ /*
+ * We are here either because we stole the rtmutex from the
+ * pending owner or we are the pending owner which failed to
+ * get the rtmutex. We have to replace the pending owner TID
+ * in the user space variable. This must be atomic as we have
+ * to preserve the owner died bit here.
+ *
+ * Note: We write the user space value _before_ changing the
+ * pi_state because we can fault here. Imagine swapped out
+ * pages or a fork, which was running right before we acquired
+ * mmap_sem, that marked all the anonymous memory readonly for
+ * cow.
+ *
+ * Modifying pi_state _before_ the user space value would
+ * leave the pi_state in an inconsistent state when we fault
+ * here, because we need to drop the hash bucket lock to
+ * handle the fault. This might be observed in the PID check
+ * in lookup_pi_state.
+ */
+retry:
+ if (get_futex_value_locked(&uval, uaddr))
+ goto handle_fault;
+
+ while (1) {
+ newval = (uval & FUTEX_OWNER_DIED) | newtid;
+
+ curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
+
+ if (curval == -EFAULT)
+ goto handle_fault;
+ if (curval == uval)
+ break;
+ uval = curval;
+ }
+
+ /*
+ * We fixed up user space. Now we need to fix the pi_state
+ * itself.
+ */
if (pi_state->owner != NULL) {
spin_lock_irq(&pi_state->owner->pi_lock);
WARN_ON(list_empty(&pi_state->list));
list_del_init(&pi_state->list);
spin_unlock_irq(&pi_state->owner->pi_lock);
- } else
- newtid |= FUTEX_OWNER_DIED;
+ }
pi_state->owner = newowner;
@@ -1118,26 +1161,35 @@ static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
WARN_ON(!list_empty(&pi_state->list));
list_add(&pi_state->list, &newowner->pi_state_list);
spin_unlock_irq(&newowner->pi_lock);
+ return 0;
/*
- * We own it, so we have to replace the pending owner
- * TID. This must be atomic as we have preserve the
- * owner died bit here.
+ * To handle the page fault we need to drop the hash bucket
+ * lock here. That gives the other task (either the pending
+ * owner itself or the task which stole the rtmutex) the
+ * chance to try the fixup of the pi_state. So once we are
+ * back from handling the fault we need to check the pi_state
+ * after reacquiring the hash bucket lock and before trying to
+ * do another fixup. When the fixup has been done already we
+ * simply return.
*/
- ret = get_futex_value_locked(&uval, uaddr);
+handle_fault:
+ spin_unlock(q->lock_ptr);
- while (!ret) {
- newval = (uval & FUTEX_OWNER_DIED) | newtid;
+ ret = futex_handle_fault((unsigned long)uaddr, fshared, attempt++);
- curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
+ spin_lock(q->lock_ptr);
- if (curval == -EFAULT)
- ret = -EFAULT;
- if (curval == uval)
- break;
- uval = curval;
- }
- return ret;
+ /*
+ * Check if someone else fixed it for us:
+ */
+ if (pi_state->owner != oldowner)
+ return 0;
+
+ if (ret)
+ return ret;
+
+ goto retry;
}
/*
@@ -1507,7 +1559,7 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
* that case:
*/
if (q.pi_state->owner != curr)
- ret = fixup_pi_state_owner(uaddr, &q, curr);
+ ret = fixup_pi_state_owner(uaddr, &q, curr, fshared);
} else {
/*
* Catch the rare case, where the lock was released
@@ -1539,7 +1591,8 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
int res;
owner = rt_mutex_owner(&q.pi_state->pi_mutex);
- res = fixup_pi_state_owner(uaddr, &q, owner);
+ res = fixup_pi_state_owner(uaddr, &q, owner,
+ fshared);
/* propagate -EFAULT, if the fixup failed */
if (res)
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 421be5fe5cc..ab80515008f 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1003,10 +1003,18 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
*/
raise = timer->state == HRTIMER_STATE_PENDING;
+ /*
+ * We use preempt_disable to prevent this task from migrating after
+ * setting up the softirq and raising it. Otherwise, if me migrate
+ * we will raise the softirq on the wrong CPU.
+ */
+ preempt_disable();
+
unlock_hrtimer_base(timer, &flags);
if (raise)
hrtimer_raise_softirq();
+ preempt_enable();
return ret;
}
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index 14787de568b..3ec23c3ec97 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -52,6 +52,7 @@
#include <asm/byteorder.h>
#include <asm/atomic.h>
#include <asm/system.h>
+#include <asm/unaligned.h>
static int kgdb_break_asap;
@@ -227,8 +228,6 @@ void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
* GDB remote protocol parser:
*/
-static const char hexchars[] = "0123456789abcdef";
-
static int hex(char ch)
{
if ((ch >= 'a') && (ch <= 'f'))
@@ -316,8 +315,8 @@ static void put_packet(char *buffer)
}
kgdb_io_ops->write_char('#');
- kgdb_io_ops->write_char(hexchars[checksum >> 4]);
- kgdb_io_ops->write_char(hexchars[checksum & 0xf]);
+ kgdb_io_ops->write_char(hex_asc_hi(checksum));
+ kgdb_io_ops->write_char(hex_asc_lo(checksum));
if (kgdb_io_ops->flush)
kgdb_io_ops->flush();
@@ -478,8 +477,8 @@ static void error_packet(char *pkt, int error)
{
error = -error;
pkt[0] = 'E';
- pkt[1] = hexchars[(error / 10)];
- pkt[2] = hexchars[(error % 10)];
+ pkt[1] = hex_asc[(error / 10)];
+ pkt[2] = hex_asc[(error % 10)];
pkt[3] = '\0';
}
@@ -510,10 +509,7 @@ static void int_to_threadref(unsigned char *id, int value)
scan = (unsigned char *)id;
while (i--)
*scan++ = 0;
- *scan++ = (value >> 24) & 0xff;
- *scan++ = (value >> 16) & 0xff;
- *scan++ = (value >> 8) & 0xff;
- *scan++ = (value & 0xff);
+ put_unaligned_be32(value, scan);
}
static struct task_struct *getthread(struct pt_regs *regs, int tid)
@@ -1503,7 +1499,8 @@ int kgdb_nmicallback(int cpu, void *regs)
return 1;
}
-void kgdb_console_write(struct console *co, const char *s, unsigned count)
+static void kgdb_console_write(struct console *co, const char *s,
+ unsigned count)
{
unsigned long flags;
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 1e0250cb948..d4998f81e22 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -699,8 +699,9 @@ static int __register_kprobes(struct kprobe **kps, int num,
return -EINVAL;
for (i = 0; i < num; i++) {
ret = __register_kprobe(kps[i], called_from);
- if (ret < 0 && i > 0) {
- unregister_kprobes(kps, i);
+ if (ret < 0) {
+ if (i > 0)
+ unregister_kprobes(kps, i);
break;
}
}
@@ -776,8 +777,9 @@ static int __register_jprobes(struct jprobe **jps, int num,
jp->kp.break_handler = longjmp_break_handler;
ret = __register_kprobe(&jp->kp, called_from);
}
- if (ret < 0 && i > 0) {
- unregister_jprobes(jps, i);
+ if (ret < 0) {
+ if (i > 0)
+ unregister_jprobes(jps, i);
break;
}
}
@@ -920,8 +922,9 @@ static int __register_kretprobes(struct kretprobe **rps, int num,
return -EINVAL;
for (i = 0; i < num; i++) {
ret = __register_kretprobe(rps[i], called_from);
- if (ret < 0 && i > 0) {
- unregister_kretprobes(rps, i);
+ if (ret < 0) {
+ if (i > 0)
+ unregister_kretprobes(rps, i);
break;
}
}
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index f4ffbd0f306..a38895a5b8e 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -89,8 +89,22 @@ static void force_quiescent_state(struct rcu_data *rdp,
/*
* Don't send IPI to itself. With irqs disabled,
* rdp->cpu is the current cpu.
+ *
+ * cpu_online_map is updated by the _cpu_down()
+ * using stop_machine_run(). Since we're in irqs disabled
+ * section, stop_machine_run() is not exectuting, hence
+ * the cpu_online_map is stable.
+ *
+ * However, a cpu might have been offlined _just_ before
+ * we disabled irqs while entering here.
+ * And rcu subsystem might not yet have handled the CPU_DEAD
+ * notification, leading to the offlined cpu's bit
+ * being set in the rcp->cpumask.
+ *
+ * Hence cpumask = (rcp->cpumask & cpu_online_map) to prevent
+ * sending smp_reschedule() to an offlined CPU.
*/
- cpumask = rcp->cpumask;
+ cpus_and(cpumask, rcp->cpumask, cpu_online_map);
cpu_clear(rdp->cpu, cpumask);
for_each_cpu_mask(cpu, cpumask)
smp_send_reschedule(cpu);
diff --git a/kernel/rcupreempt.c b/kernel/rcupreempt.c
index e1cdf196a51..5e02b774070 100644
--- a/kernel/rcupreempt.c
+++ b/kernel/rcupreempt.c
@@ -217,8 +217,6 @@ long rcu_batches_completed(void)
}
EXPORT_SYMBOL_GPL(rcu_batches_completed);
-EXPORT_SYMBOL_GPL(rcu_batches_completed_bh);
-
void __rcu_read_lock(void)
{
int idx;
diff --git a/kernel/sched.c b/kernel/sched.c
index bfb8ad8ed17..94ead43eda6 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -312,12 +312,15 @@ static DEFINE_SPINLOCK(task_group_lock);
#endif
/*
- * A weight of 0, 1 or ULONG_MAX can cause arithmetics problems.
+ * A weight of 0 or 1 can cause arithmetics problems.
+ * A weight of a cfs_rq is the sum of weights of which entities
+ * are queued on this cfs_rq, so a weight of a entity should not be
+ * too large, so as the shares value of a task group.
* (The default weight is 1024 - so there's no practical
* limitation from this.)
*/
#define MIN_SHARES 2
-#define MAX_SHARES (ULONG_MAX - 1)
+#define MAX_SHARES (1UL << 18)
static int init_task_group_load = INIT_TASK_GROUP_LOAD;
#endif
@@ -1124,6 +1127,7 @@ static enum hrtimer_restart hrtick(struct hrtimer *timer)
return HRTIMER_NORESTART;
}
+#ifdef CONFIG_SMP
static void hotplug_hrtick_disable(int cpu)
{
struct rq *rq = cpu_rq(cpu);
@@ -1179,6 +1183,7 @@ static void init_hrtick(void)
{
hotcpu_notifier(hotplug_hrtick, 0);
}
+#endif /* CONFIG_SMP */
static void init_rq_hrtick(struct rq *rq)
{
@@ -1337,8 +1342,13 @@ calc_delta_mine(unsigned long delta_exec, unsigned long weight,
{
u64 tmp;
- if (!lw->inv_weight)
- lw->inv_weight = 1 + (WMULT_CONST-lw->weight/2)/(lw->weight+1);
+ if (!lw->inv_weight) {
+ if (BITS_PER_LONG > 32 && unlikely(lw->weight >= WMULT_CONST))
+ lw->inv_weight = 1;
+ else
+ lw->inv_weight = 1 + (WMULT_CONST-lw->weight/2)
+ / (lw->weight+1);
+ }
tmp = (u64)delta_exec * weight;
/*
@@ -4159,12 +4169,10 @@ need_resched_nonpreemptible:
clear_tsk_need_resched(prev);
if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
- if (unlikely((prev->state & TASK_INTERRUPTIBLE) &&
- signal_pending(prev))) {
+ if (unlikely(signal_pending_state(prev->state, prev)))
prev->state = TASK_RUNNING;
- } else {
+ else
deactivate_task(rq, prev, 1);
- }
switch_count = &prev->nvcsw;
}
@@ -4390,22 +4398,20 @@ do_wait_for_common(struct completion *x, long timeout, int state)
signal_pending(current)) ||
(state == TASK_KILLABLE &&
fatal_signal_pending(current))) {
- __remove_wait_queue(&x->wait, &wait);
- return -ERESTARTSYS;
+ timeout = -ERESTARTSYS;
+ break;
}
__set_current_state(state);
spin_unlock_irq(&x->wait.lock);
timeout = schedule_timeout(timeout);
spin_lock_irq(&x->wait.lock);
- if (!timeout) {
- __remove_wait_queue(&x->wait, &wait);
- return timeout;
- }
- } while (!x->done);
+ } while (!x->done && timeout);
__remove_wait_queue(&x->wait, &wait);
+ if (!x->done)
+ return timeout;
}
x->done--;
- return timeout;
+ return timeout ?: 1;
}
static long __sched
@@ -5881,6 +5887,7 @@ static void migrate_dead_tasks(unsigned int dead_cpu)
next = pick_next_task(rq, rq->curr);
if (!next)
break;
+ next->sched_class->put_prev_task(rq, next);
migrate_dead(dead_cpu, next);
}
@@ -6871,7 +6878,12 @@ static int default_relax_domain_level = -1;
static int __init setup_relax_domain_level(char *str)
{
- default_relax_domain_level = simple_strtoul(str, NULL, 0);
+ unsigned long val;
+
+ val = simple_strtoul(str, NULL, 0);
+ if (val < SD_LV_MAX)
+ default_relax_domain_level = val;
+
return 1;
}
__setup("relax_domain_level=", setup_relax_domain_level);
@@ -7230,6 +7242,18 @@ void __attribute__((weak)) arch_update_cpu_topology(void)
}
/*
+ * Free current domain masks.
+ * Called after all cpus are attached to NULL domain.
+ */
+static void free_sched_domains(void)
+{
+ ndoms_cur = 0;
+ if (doms_cur != &fallback_doms)
+ kfree(doms_cur);
+ doms_cur = &fallback_doms;
+}
+
+/*
* Set up scheduler domains and groups. Callers must hold the hotplug lock.
* For now this just excludes isolated cpus, but could be used to
* exclude other special cases in the future.
@@ -7376,6 +7400,7 @@ int arch_reinit_sched_domains(void)
get_online_cpus();
mutex_lock(&sched_domains_mutex);
detach_destroy_domains(&cpu_online_map);
+ free_sched_domains();
err = arch_init_sched_domains(&cpu_online_map);
mutex_unlock(&sched_domains_mutex);
put_online_cpus();
@@ -7461,6 +7486,7 @@ static int update_sched_domains(struct notifier_block *nfb,
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
detach_destroy_domains(&cpu_online_map);
+ free_sched_domains();
return NOTIFY_OK;
case CPU_UP_CANCELED:
@@ -7479,8 +7505,16 @@ static int update_sched_domains(struct notifier_block *nfb,
return NOTIFY_DONE;
}
+#ifndef CONFIG_CPUSETS
+ /*
+ * Create default domain partitioning if cpusets are disabled.
+ * Otherwise we let cpusets rebuild the domains based on the
+ * current setup.
+ */
+
/* The hotplug lock is already held by cpu_up/cpu_down */
arch_init_sched_domains(&cpu_online_map);
+#endif
return NOTIFY_OK;
}
@@ -7620,7 +7654,6 @@ static void init_tg_rt_entry(struct task_group *tg, struct rt_rq *rt_rq,
else
rt_se->rt_rq = parent->my_q;
- rt_se->rt_rq = &rq->rt;
rt_se->my_q = rt_rq;
rt_se->parent = parent;
INIT_LIST_HEAD(&rt_se->run_list);
@@ -8342,7 +8375,7 @@ static unsigned long to_ratio(u64 period, u64 runtime)
#ifdef CONFIG_CGROUP_SCHED
static int __rt_schedulable(struct task_group *tg, u64 period, u64 runtime)
{
- struct task_group *tgi, *parent = tg->parent;
+ struct task_group *tgi, *parent = tg ? tg->parent : NULL;
unsigned long total = 0;
if (!parent) {
@@ -8469,6 +8502,9 @@ int sched_group_set_rt_period(struct task_group *tg, long rt_period_us)
rt_period = (u64)rt_period_us * NSEC_PER_USEC;
rt_runtime = tg->rt_bandwidth.rt_runtime;
+ if (rt_period == 0)
+ return -EINVAL;
+
return tg_set_bandwidth(tg, rt_period, rt_runtime);
}
diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 3432d573205..0f3c19197fa 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -250,7 +250,8 @@ static int do_sched_rt_period_timer(struct rt_bandwidth *rt_b, int overrun)
if (rt_rq->rt_time || rt_rq->rt_nr_running)
idle = 0;
spin_unlock(&rt_rq->rt_runtime_lock);
- }
+ } else if (rt_rq->rt_nr_running)
+ idle = 0;
if (enqueue)
sched_rt_rq_enqueue(rt_rq);
@@ -449,13 +450,19 @@ void dec_rt_tasks(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
#endif
}
-static void enqueue_rt_entity(struct sched_rt_entity *rt_se)
+static void __enqueue_rt_entity(struct sched_rt_entity *rt_se)
{
struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
struct rt_prio_array *array = &rt_rq->active;
struct rt_rq *group_rq = group_rt_rq(rt_se);
- if (group_rq && rt_rq_throttled(group_rq))
+ /*
+ * Don't enqueue the group if its throttled, or when empty.
+ * The latter is a consequence of the former when a child group
+ * get throttled and the current group doesn't have any other
+ * active members.
+ */
+ if (group_rq && (rt_rq_throttled(group_rq) || !group_rq->rt_nr_running))
return;
list_add_tail(&rt_se->run_list, array->queue + rt_se_prio(rt_se));
@@ -464,7 +471,7 @@ static void enqueue_rt_entity(struct sched_rt_entity *rt_se)
inc_rt_tasks(rt_se, rt_rq);
}
-static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
+static void __dequeue_rt_entity(struct sched_rt_entity *rt_se)
{
struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
struct rt_prio_array *array = &rt_rq->active;
@@ -480,11 +487,10 @@ static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
* Because the prio of an upper entry depends on the lower
* entries, we must remove entries top - down.
*/
-static void dequeue_rt_stack(struct task_struct *p)
+static void dequeue_rt_stack(struct sched_rt_entity *rt_se)
{
- struct sched_rt_entity *rt_se, *back = NULL;
+ struct sched_rt_entity *back = NULL;
- rt_se = &p->rt;
for_each_sched_rt_entity(rt_se) {
rt_se->back = back;
back = rt_se;
@@ -492,7 +498,26 @@ static void dequeue_rt_stack(struct task_struct *p)
for (rt_se = back; rt_se; rt_se = rt_se->back) {
if (on_rt_rq(rt_se))
- dequeue_rt_entity(rt_se);
+ __dequeue_rt_entity(rt_se);
+ }
+}
+
+static void enqueue_rt_entity(struct sched_rt_entity *rt_se)
+{
+ dequeue_rt_stack(rt_se);
+ for_each_sched_rt_entity(rt_se)
+ __enqueue_rt_entity(rt_se);
+}
+
+static void dequeue_rt_entity(struct sched_rt_entity *rt_se)
+{
+ dequeue_rt_stack(rt_se);
+
+ for_each_sched_rt_entity(rt_se) {
+ struct rt_rq *rt_rq = group_rt_rq(rt_se);
+
+ if (rt_rq && rt_rq->rt_nr_running)
+ __enqueue_rt_entity(rt_se);
}
}
@@ -506,32 +531,15 @@ static void enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup)
if (wakeup)
rt_se->timeout = 0;
- dequeue_rt_stack(p);
-
- /*
- * enqueue everybody, bottom - up.
- */
- for_each_sched_rt_entity(rt_se)
- enqueue_rt_entity(rt_se);
+ enqueue_rt_entity(rt_se);
}
static void dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep)
{
struct sched_rt_entity *rt_se = &p->rt;
- struct rt_rq *rt_rq;
update_curr_rt(rq);
-
- dequeue_rt_stack(p);
-
- /*
- * re-enqueue all non-empty rt_rq entities.
- */
- for_each_sched_rt_entity(rt_se) {
- rt_rq = group_rt_rq(rt_se);
- if (rt_rq && rt_rq->rt_nr_running)
- enqueue_rt_entity(rt_se);
- }
+ dequeue_rt_entity(rt_se);
}
/*
@@ -542,8 +550,10 @@ static
void requeue_rt_entity(struct rt_rq *rt_rq, struct sched_rt_entity *rt_se)
{
struct rt_prio_array *array = &rt_rq->active;
+ struct list_head *queue = array->queue + rt_se_prio(rt_se);
- list_move_tail(&rt_se->run_list, array->queue + rt_se_prio(rt_se));
+ if (on_rt_rq(rt_se))
+ list_move_tail(&rt_se->run_list, queue);
}
static void requeue_task_rt(struct rq *rq, struct task_struct *p)
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index a38878e0e49..80179ef7450 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -198,6 +198,9 @@ static inline void sched_info_queued(struct task_struct *t)
/*
* Called when a process ceases being the active-running process, either
* voluntarily or involuntarily. Now we can calculate how long we ran.
+ * Also, if the process is still in the TASK_RUNNING state, call
+ * sched_info_queued() to mark that it has now again started waiting on
+ * the runqueue.
*/
static inline void sched_info_depart(struct task_struct *t)
{
@@ -206,6 +209,9 @@ static inline void sched_info_depart(struct task_struct *t)
t->sched_info.cpu_time += delta;
rq_sched_info_depart(task_rq(t), delta);
+
+ if (t->state == TASK_RUNNING)
+ sched_info_queued(t);
}
/*
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 01b6522fd92..a272d78185e 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -49,12 +49,17 @@ static unsigned long get_timestamp(int this_cpu)
return cpu_clock(this_cpu) >> 30LL; /* 2^30 ~= 10^9 */
}
-void touch_softlockup_watchdog(void)
+static void __touch_softlockup_watchdog(void)
{
int this_cpu = raw_smp_processor_id();
__raw_get_cpu_var(touch_timestamp) = get_timestamp(this_cpu);
}
+
+void touch_softlockup_watchdog(void)
+{
+ __raw_get_cpu_var(touch_timestamp) = 0;
+}
EXPORT_SYMBOL(touch_softlockup_watchdog);
void touch_all_softlockup_watchdogs(void)
@@ -80,7 +85,7 @@ void softlockup_tick(void)
unsigned long now;
if (touch_timestamp == 0) {
- touch_softlockup_watchdog();
+ __touch_softlockup_watchdog();
return;
}
@@ -95,7 +100,7 @@ void softlockup_tick(void)
/* do not print during early bootup: */
if (unlikely(system_state != SYSTEM_RUNNING)) {
- touch_softlockup_watchdog();
+ __touch_softlockup_watchdog();
return;
}
@@ -115,6 +120,7 @@ void softlockup_tick(void)
printk(KERN_ERR "BUG: soft lockup - CPU#%d stuck for %lus! [%s:%d]\n",
this_cpu, now - touch_timestamp,
current->comm, task_pid_nr(current));
+ print_modules();
if (regs)
show_regs(regs);
else
@@ -214,7 +220,7 @@ static int watchdog(void *__bind_cpu)
sched_setscheduler(current, SCHED_FIFO, &param);
/* initialize timestamp */
- touch_softlockup_watchdog();
+ __touch_softlockup_watchdog();
set_current_state(TASK_INTERRUPTIBLE);
/*
@@ -223,7 +229,7 @@ static int watchdog(void *__bind_cpu)
* debug-printout triggers in softlockup_tick().
*/
while (!kthread_should_stop()) {
- touch_softlockup_watchdog();
+ __touch_softlockup_watchdog();
schedule();
if (kthread_should_stop())
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 29fc39f1029..ce7799540c9 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -13,7 +13,7 @@
* Kai Petzke <wpp@marie.physik.tu-berlin.de>
* Theodore Ts'o <tytso@mit.edu>
*
- * Made to use alloc_percpu by Christoph Lameter <clameter@sgi.com>.
+ * Made to use alloc_percpu by Christoph Lameter.
*/
#include <linux/module.h>
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-17 01:54:24 +0000