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Date: Fri, 20 Jul 2018 00:38:34 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
linux-rt-users <linux-rt-users@...r.kernel.org>,
Steven Rostedt <rostedt@...dmis.org>
Subject: [ANNOUNCE] v4.16.18-rt10
Dear RT folks!
I'm pleased to announce the v4.16.18-rt10 patch set.
Changes since v4.16.18-rt9:
- The gicv3 now gained a raw_spinlock_t and allocates memory early.
This avoids splats early during boot.
- The migrate_disable() replacements for UP and non-RT builds were
broken. The logic changed for this configuration and now
migrate_disable() turns on preempt_disable(). Reported by Joe Korty.
- The trace events in the cgroup code allocate a sleeping lock which
does not work on RT. Reported by Clark Williams, patch by Steven
Rostedt.
- Avoid a preempt_disable() section during fork. This gives
debug_object() an additional opportunity to refill its pool if
needed.
- Drop the "Prevent broadcast signals" patch. Broadcast signals are
not prevented by preventing sig_kernel_only() and
sig_kernel_coredump() (as explained by Eric W. Biederman). This change
was probably required in the early days but I can't find a reason why it
should be still required.
- The "delay ioapic unmask during pending setaffinity" patch been
replaced with an updated version by Thomas Gleixner.
Known issues
- A warning triggered in "rcu_note_context_switch" originated from
SyS_timer_gettime(). The issue was always there, it is now
visible. Reported by Grygorii Strashko and Daniel Wagner.
The delta patch against v4.16.18-rt9 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.16/incr/patch-4.16.18-rt9-rt10.patch.xz
You can get this release via the git tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v4.16.18-rt10
The RT patch against v4.16.18 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.16/older/patch-4.16.18-rt10.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.16/older/patches-4.16.18-rt10.tar.xz
Sebastian
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 7b11ef4be6f2..75cff68944e6 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1729,20 +1729,20 @@ static bool io_apic_level_ack_pending(struct mp_chip_data *data)
return false;
}
-static inline bool ioapic_irqd_mask(struct irq_data *data)
+static inline bool ioapic_prepare_move(struct irq_data *data)
{
/* If we are moving the irq we need to mask it */
- if (unlikely(irqd_is_setaffinity_pending(data) &&
- !irqd_irq_inprogress(data))) {
- mask_ioapic_irq(data);
+ if (unlikely(irqd_is_setaffinity_pending(data))) {
+ if (!irqd_irq_masked(data))
+ mask_ioapic_irq(data);
return true;
}
return false;
}
-static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
+static inline void ioapic_finish_move(struct irq_data *data, bool moveit)
{
- if (unlikely(masked)) {
+ if (unlikely(moveit)) {
/* Only migrate the irq if the ack has been received.
*
* On rare occasions the broadcast level triggered ack gets
@@ -1771,15 +1771,17 @@ static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
*/
if (!io_apic_level_ack_pending(data->chip_data))
irq_move_masked_irq(data);
- unmask_ioapic_irq(data);
+ /* If the irq is masked in the core, leave it */
+ if (!irqd_irq_masked(data))
+ unmask_ioapic_irq(data);
}
}
#else
-static inline bool ioapic_irqd_mask(struct irq_data *data)
+static inline bool ioapic_prepare_move(struct irq_data *data)
{
return false;
}
-static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
+static inline void ioapic_finish_move(struct irq_data *data, bool moveit)
{
}
#endif
@@ -1788,11 +1790,11 @@ static void ioapic_ack_level(struct irq_data *irq_data)
{
struct irq_cfg *cfg = irqd_cfg(irq_data);
unsigned long v;
- bool masked;
+ bool moveit;
int i;
irq_complete_move(cfg);
- masked = ioapic_irqd_mask(irq_data);
+ moveit = ioapic_prepare_move(irq_data);
/*
* It appears there is an erratum which affects at least version 0x11
@@ -1847,7 +1849,7 @@ static void ioapic_ack_level(struct irq_data *irq_data)
eoi_ioapic_pin(cfg->vector, irq_data->chip_data);
}
- ioapic_irqd_unmask(irq_data, masked);
+ ioapic_finish_move(irq_data, moveit);
}
static void ioapic_ir_ack_level(struct irq_data *irq_data)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 2cbb19cddbf8..d9c479dcd4cb 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -156,7 +156,7 @@ static struct {
} vpe_proxy;
static LIST_HEAD(its_nodes);
-static DEFINE_SPINLOCK(its_lock);
+static DEFINE_RAW_SPINLOCK(its_lock);
static struct rdists *gic_rdists;
static struct irq_domain *its_parent;
@@ -167,6 +167,7 @@ static DEFINE_RAW_SPINLOCK(vmovp_lock);
static DEFINE_IDA(its_vpeid_ida);
#define gic_data_rdist() (raw_cpu_ptr(gic_rdists->rdist))
+#define gic_data_rdist_cpu(cpu) (per_cpu_ptr(gic_rdists->rdist, cpu))
#define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base)
#define gic_data_rdist_vlpi_base() (gic_data_rdist_rd_base() + SZ_128K)
@@ -1827,15 +1828,17 @@ static int its_alloc_collections(struct its_node *its)
return 0;
}
-static struct page *its_allocate_pending_table(gfp_t gfp_flags)
+static struct page *its_allocate_pending_table(unsigned int cpu)
{
struct page *pend_page;
+ unsigned int order;
/*
* The pending pages have to be at least 64kB aligned,
* hence the 'max(LPI_PENDBASE_SZ, SZ_64K)' below.
*/
- pend_page = alloc_pages(gfp_flags | __GFP_ZERO,
- get_order(max_t(u32, LPI_PENDBASE_SZ, SZ_64K)));
+ order = get_order(max_t(u32, LPI_PENDBASE_SZ, SZ_64K));
+ pend_page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_ZERO,
+ order);
if (!pend_page)
return NULL;
@@ -1851,6 +1854,28 @@ static void its_free_pending_table(struct page *pt)
get_order(max_t(u32, LPI_PENDBASE_SZ, SZ_64K)));
}
+static int its_alloc_pend_page(unsigned int cpu)
+{
+ struct page *pend_page;
+ phys_addr_t paddr;
+
+ pend_page = gic_data_rdist_cpu(cpu)->pend_page;
+ if (pend_page)
+ return 0;
+
+ pend_page = its_allocate_pending_table(cpu);
+ if (!pend_page) {
+ pr_err("Failed to allocate PENDBASE for CPU%d\n",
+ smp_processor_id());
+ return -ENOMEM;
+ }
+
+ paddr = page_to_phys(pend_page);
+ pr_info("CPU%d: using LPI pending table @%pa\n", cpu, &paddr);
+ gic_data_rdist_cpu(cpu)->pend_page = pend_page;
+ return 0;
+}
+
static void its_cpu_init_lpis(void)
{
void __iomem *rbase = gic_data_rdist_rd_base();
@@ -1859,21 +1884,8 @@ static void its_cpu_init_lpis(void)
/* If we didn't allocate the pending table yet, do it now */
pend_page = gic_data_rdist()->pend_page;
- if (!pend_page) {
- phys_addr_t paddr;
-
- pend_page = its_allocate_pending_table(GFP_NOWAIT);
- if (!pend_page) {
- pr_err("Failed to allocate PENDBASE for CPU%d\n",
- smp_processor_id());
- return;
- }
-
- paddr = page_to_phys(pend_page);
- pr_info("CPU%d: using LPI pending table @%pa\n",
- smp_processor_id(), &paddr);
- gic_data_rdist()->pend_page = pend_page;
- }
+ if (!pend_page)
+ return;
/* Disable LPIs */
val = readl_relaxed(rbase + GICR_CTLR);
@@ -1943,7 +1955,7 @@ static void its_cpu_init_collection(void)
struct its_node *its;
int cpu;
- spin_lock(&its_lock);
+ raw_spin_lock(&its_lock);
cpu = smp_processor_id();
list_for_each_entry(its, &its_nodes, entry) {
@@ -1985,7 +1997,7 @@ static void its_cpu_init_collection(void)
its_send_invall(its, &its->collections[cpu]);
}
- spin_unlock(&its_lock);
+ raw_spin_unlock(&its_lock);
}
static struct its_device *its_find_device(struct its_node *its, u32 dev_id)
@@ -2708,7 +2720,7 @@ static int its_vpe_init(struct its_vpe *vpe)
return vpe_id;
/* Allocate VPT */
- vpt_page = its_allocate_pending_table(GFP_KERNEL);
+ vpt_page = its_allocate_pending_table(raw_smp_processor_id());
if (!vpt_page) {
its_vpe_id_free(vpe_id);
return -ENOMEM;
@@ -3264,9 +3276,9 @@ static int __init its_probe_one(struct resource *res,
if (err)
goto out_free_tables;
- spin_lock(&its_lock);
+ raw_spin_lock(&its_lock);
list_add(&its->entry, &its_nodes);
- spin_unlock(&its_lock);
+ raw_spin_unlock(&its_lock);
return 0;
@@ -3505,6 +3517,16 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
if (err)
return err;
+ err = cpuhp_setup_state(CPUHP_BP_PREPARE_DYN, "irqchip/arm/gicv3:prepare",
+ its_alloc_pend_page, NULL);
+ if (err < 0) {
+ pr_warn("ITS: Can't register CPU-hoplug callback.\n");
+ return err;
+ }
+ err = its_alloc_pend_page(smp_processor_id());
+ if (err < 0)
+ return err;
+
list_for_each_entry(its, &its_nodes, entry)
has_v4 |= its->is_v4;
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 043e431a7e8e..9e41b8548be8 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -224,7 +224,7 @@ do { \
#define preemptible() (preempt_count() == 0 && !irqs_disabled())
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
extern void migrate_disable(void);
extern void migrate_enable(void);
@@ -241,8 +241,8 @@ static inline int __migrate_disabled(struct task_struct *p)
}
#else
-#define migrate_disable() barrier()
-#define migrate_enable() barrier()
+#define migrate_disable() preempt_disable()
+#define migrate_enable() preempt_enable()
static inline int __migrate_disabled(struct task_struct *p)
{
return 0;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1e7e4bf3a756..a0c1c0cae992 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -646,7 +646,7 @@ struct task_struct {
int nr_cpus_allowed;
const cpumask_t *cpus_ptr;
cpumask_t cpus_mask;
-#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP)
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
int migrate_disable;
int migrate_disable_update;
int pinned_on_cpu;
@@ -655,8 +655,8 @@ struct task_struct {
# endif
#elif !defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
- int migrate_disable;
# ifdef CONFIG_SCHED_DEBUG
+ int migrate_disable;
int migrate_disable_atomic;
# endif
#endif
diff --git a/include/trace/events/cgroup.h b/include/trace/events/cgroup.h
index d74722c2ac8b..a401ff5e7847 100644
--- a/include/trace/events/cgroup.h
+++ b/include/trace/events/cgroup.h
@@ -53,24 +53,22 @@ DEFINE_EVENT(cgroup_root, cgroup_remount,
DECLARE_EVENT_CLASS(cgroup,
- TP_PROTO(struct cgroup *cgrp),
+ TP_PROTO(struct cgroup *cgrp, const char *path),
- TP_ARGS(cgrp),
+ TP_ARGS(cgrp, path),
TP_STRUCT__entry(
__field( int, root )
__field( int, id )
__field( int, level )
- __dynamic_array(char, path,
- cgroup_path(cgrp, NULL, 0) + 1)
+ __string( path, path )
),
TP_fast_assign(
__entry->root = cgrp->root->hierarchy_id;
__entry->id = cgrp->id;
__entry->level = cgrp->level;
- cgroup_path(cgrp, __get_dynamic_array(path),
- __get_dynamic_array_len(path));
+ __assign_str(path, path);
),
TP_printk("root=%d id=%d level=%d path=%s",
@@ -79,45 +77,45 @@ DECLARE_EVENT_CLASS(cgroup,
DEFINE_EVENT(cgroup, cgroup_mkdir,
- TP_PROTO(struct cgroup *cgroup),
+ TP_PROTO(struct cgroup *cgrp, const char *path),
- TP_ARGS(cgroup)
+ TP_ARGS(cgrp, path)
);
DEFINE_EVENT(cgroup, cgroup_rmdir,
- TP_PROTO(struct cgroup *cgroup),
+ TP_PROTO(struct cgroup *cgrp, const char *path),
- TP_ARGS(cgroup)
+ TP_ARGS(cgrp, path)
);
DEFINE_EVENT(cgroup, cgroup_release,
- TP_PROTO(struct cgroup *cgroup),
+ TP_PROTO(struct cgroup *cgrp, const char *path),
- TP_ARGS(cgroup)
+ TP_ARGS(cgrp, path)
);
DEFINE_EVENT(cgroup, cgroup_rename,
- TP_PROTO(struct cgroup *cgroup),
+ TP_PROTO(struct cgroup *cgrp, const char *path),
- TP_ARGS(cgroup)
+ TP_ARGS(cgrp, path)
);
DECLARE_EVENT_CLASS(cgroup_migrate,
- TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
+ TP_PROTO(struct cgroup *dst_cgrp, const char *path,
+ struct task_struct *task, bool threadgroup),
- TP_ARGS(dst_cgrp, task, threadgroup),
+ TP_ARGS(dst_cgrp, path, task, threadgroup),
TP_STRUCT__entry(
__field( int, dst_root )
__field( int, dst_id )
__field( int, dst_level )
- __dynamic_array(char, dst_path,
- cgroup_path(dst_cgrp, NULL, 0) + 1)
__field( int, pid )
+ __string( dst_path, path )
__string( comm, task->comm )
),
@@ -125,8 +123,7 @@ DECLARE_EVENT_CLASS(cgroup_migrate,
__entry->dst_root = dst_cgrp->root->hierarchy_id;
__entry->dst_id = dst_cgrp->id;
__entry->dst_level = dst_cgrp->level;
- cgroup_path(dst_cgrp, __get_dynamic_array(dst_path),
- __get_dynamic_array_len(dst_path));
+ __assign_str(dst_path, path);
__entry->pid = task->pid;
__assign_str(comm, task->comm);
),
@@ -138,16 +135,18 @@ DECLARE_EVENT_CLASS(cgroup_migrate,
DEFINE_EVENT(cgroup_migrate, cgroup_attach_task,
- TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
+ TP_PROTO(struct cgroup *dst_cgrp, const char *path,
+ struct task_struct *task, bool threadgroup),
- TP_ARGS(dst_cgrp, task, threadgroup)
+ TP_ARGS(dst_cgrp, path, task, threadgroup)
);
DEFINE_EVENT(cgroup_migrate, cgroup_transfer_tasks,
- TP_PROTO(struct cgroup *dst_cgrp, struct task_struct *task, bool threadgroup),
+ TP_PROTO(struct cgroup *dst_cgrp, const char *path,
+ struct task_struct *task, bool threadgroup),
- TP_ARGS(dst_cgrp, task, threadgroup)
+ TP_ARGS(dst_cgrp, path, task, threadgroup)
);
#endif /* _TRACE_CGROUP_H */
diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
index b928b27050c6..8ece16c74598 100644
--- a/kernel/cgroup/cgroup-internal.h
+++ b/kernel/cgroup/cgroup-internal.h
@@ -8,6 +8,32 @@
#include <linux/list.h>
#include <linux/refcount.h>
+#define TRACE_CGROUP_PATH_LEN 1024
+extern spinlock_t trace_cgroup_path_lock;
+extern char trace_cgroup_path[TRACE_CGROUP_PATH_LEN];
+
+/*
+ * cgroup_path() takes a spin lock. It is good practice not to take
+ * spin locks within trace point handlers, as they are mostly hidden
+ * from normal view. As cgroup_path() can take the kernfs_rename_lock
+ * spin lock, it is best to not call that function from the trace event
+ * handler.
+ *
+ * Note: trace_cgroup_##type##_enabled() is a static branch that will only
+ * be set when the trace event is enabled.
+ */
+#define TRACE_CGROUP_PATH(type, cgrp, ...) \
+ do { \
+ if (trace_cgroup_##type##_enabled()) { \
+ spin_lock(&trace_cgroup_path_lock); \
+ cgroup_path(cgrp, trace_cgroup_path, \
+ TRACE_CGROUP_PATH_LEN); \
+ trace_cgroup_##type(cgrp, trace_cgroup_path, \
+ ##__VA_ARGS__); \
+ spin_unlock(&trace_cgroup_path_lock); \
+ } \
+ } while (0)
+
/*
* A cgroup can be associated with multiple css_sets as different tasks may
* belong to different cgroups on different hierarchies. In the other
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index a2c05d2476ac..d309cd0f94f2 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -135,7 +135,7 @@ int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from)
if (task) {
ret = cgroup_migrate(task, false, &mgctx);
if (!ret)
- trace_cgroup_transfer_tasks(to, task, false);
+ TRACE_CGROUP_PATH(transfer_tasks, to, task, false);
put_task_struct(task);
}
} while (task && !ret);
@@ -877,7 +877,7 @@ static int cgroup1_rename(struct kernfs_node *kn, struct kernfs_node *new_parent
ret = kernfs_rename(kn, new_parent, new_name_str);
if (!ret)
- trace_cgroup_rename(cgrp);
+ TRACE_CGROUP_PATH(rename, cgrp);
mutex_unlock(&cgroup_mutex);
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index ea798813a79d..e8e6afc8a5a2 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -80,6 +80,9 @@ EXPORT_SYMBOL_GPL(cgroup_mutex);
EXPORT_SYMBOL_GPL(css_set_lock);
#endif
+DEFINE_SPINLOCK(trace_cgroup_path_lock);
+char trace_cgroup_path[TRACE_CGROUP_PATH_LEN];
+
/*
* Protects cgroup_idr and css_idr so that IDs can be released without
* grabbing cgroup_mutex.
@@ -2620,7 +2623,7 @@ int cgroup_attach_task(struct cgroup *dst_cgrp, struct task_struct *leader,
cgroup_migrate_finish(&mgctx);
if (!ret)
- trace_cgroup_attach_task(dst_cgrp, leader, threadgroup);
+ TRACE_CGROUP_PATH(attach_task, dst_cgrp, leader, threadgroup);
return ret;
}
@@ -4603,7 +4606,7 @@ static void css_release_work_fn(struct swork_event *sev)
struct cgroup *tcgrp;
/* cgroup release path */
- trace_cgroup_release(cgrp);
+ TRACE_CGROUP_PATH(release, cgrp);
if (cgroup_on_dfl(cgrp))
cgroup_stat_flush(cgrp);
@@ -4939,7 +4942,7 @@ int cgroup_mkdir(struct kernfs_node *parent_kn, const char *name, umode_t mode)
if (ret)
goto out_destroy;
- trace_cgroup_mkdir(cgrp);
+ TRACE_CGROUP_PATH(mkdir, cgrp);
/* let's create and online css's */
kernfs_activate(kn);
@@ -5129,9 +5132,8 @@ int cgroup_rmdir(struct kernfs_node *kn)
return 0;
ret = cgroup_destroy_locked(cgrp);
-
if (!ret)
- trace_cgroup_rmdir(cgrp);
+ TRACE_CGROUP_PATH(rmdir, cgrp);
cgroup_kn_unlock(kn);
return ret;
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ac3fb8495bd5..70641e8f3c89 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1101,7 +1101,7 @@ void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_ma
p->nr_cpus_allowed = cpumask_weight(new_mask);
}
-#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP)
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
int __migrate_disabled(struct task_struct *p)
{
return p->migrate_disable;
@@ -1140,7 +1140,7 @@ static void __do_set_cpus_allowed_tail(struct task_struct *p,
void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
{
-#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP)
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
if (__migrate_disabled(p)) {
lockdep_assert_held(&p->pi_lock);
@@ -1213,7 +1213,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
if (cpumask_test_cpu(task_cpu(p), new_mask) || __migrate_disabled(p))
goto out;
-#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP)
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
if (__migrate_disabled(p)) {
p->migrate_disable_update = 1;
goto out;
@@ -2428,7 +2428,6 @@ static inline void init_schedstats(void) {}
int sched_fork(unsigned long clone_flags, struct task_struct *p)
{
unsigned long flags;
- int cpu = get_cpu();
__sched_fork(clone_flags, p);
/*
@@ -2464,14 +2463,12 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
p->sched_reset_on_fork = 0;
}
- if (dl_prio(p->prio)) {
- put_cpu();
+ if (dl_prio(p->prio))
return -EAGAIN;
- } else if (rt_prio(p->prio)) {
+ else if (rt_prio(p->prio))
p->sched_class = &rt_sched_class;
- } else {
+ else
p->sched_class = &fair_sched_class;
- }
init_entity_runnable_average(&p->se);
@@ -2487,7 +2484,7 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
* We're setting the CPU for the first time, we don't migrate,
* so use __set_task_cpu().
*/
- __set_task_cpu(p, cpu);
+ __set_task_cpu(p, smp_processor_id());
if (p->sched_class->task_fork)
p->sched_class->task_fork(p);
raw_spin_unlock_irqrestore(&p->pi_lock, flags);
@@ -2507,8 +2504,6 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
plist_node_init(&p->pushable_tasks, MAX_PRIO);
RB_CLEAR_NODE(&p->pushable_dl_tasks);
#endif
-
- put_cpu();
return 0;
}
@@ -7159,7 +7154,7 @@ const u32 sched_prio_to_wmult[40] = {
/* 15 */ 119304647, 148102320, 186737708, 238609294, 286331153,
};
-#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP)
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
static inline void
update_nr_migratory(struct task_struct *p, long delta)
@@ -7310,45 +7305,44 @@ EXPORT_SYMBOL(migrate_enable);
#elif !defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
void migrate_disable(void)
{
+#ifdef CONFIG_SCHED_DEBUG
struct task_struct *p = current;
if (in_atomic() || irqs_disabled()) {
-#ifdef CONFIG_SCHED_DEBUG
p->migrate_disable_atomic++;
-#endif
return;
}
-#ifdef CONFIG_SCHED_DEBUG
+
if (unlikely(p->migrate_disable_atomic)) {
tracing_off();
WARN_ON_ONCE(1);
}
-#endif
p->migrate_disable++;
+#endif
+ barrier();
}
EXPORT_SYMBOL(migrate_disable);
void migrate_enable(void)
{
+#ifdef CONFIG_SCHED_DEBUG
struct task_struct *p = current;
if (in_atomic() || irqs_disabled()) {
-#ifdef CONFIG_SCHED_DEBUG
p->migrate_disable_atomic--;
-#endif
return;
}
-#ifdef CONFIG_SCHED_DEBUG
if (unlikely(p->migrate_disable_atomic)) {
tracing_off();
WARN_ON_ONCE(1);
}
-#endif
WARN_ON_ONCE(p->migrate_disable <= 0);
p->migrate_disable--;
+#endif
+ barrier();
}
EXPORT_SYMBOL(migrate_enable);
#endif
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 93f4765520d1..a8fb58a0f24e 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -1030,7 +1030,7 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
P(dl.runtime);
P(dl.deadline);
}
-#if defined(CONFIG_PREEMPT_COUNT) && defined(CONFIG_SMP)
+#if defined(CONFIG_SMP) && defined(CONFIG_PREEMPT_RT_BASE)
P(migrate_disable);
#endif
P(nr_cpus_allowed);
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index e1c5b9b64140..0d14e044b46f 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -434,7 +434,6 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
static struct pid *good_sigevent(sigevent_t * event)
{
struct task_struct *rtn = current->group_leader;
- int sig = event->sigev_signo;
switch (event->sigev_notify) {
case SIGEV_SIGNAL | SIGEV_THREAD_ID:
@@ -444,8 +443,7 @@ static struct pid *good_sigevent(sigevent_t * event)
/* FALLTHRU */
case SIGEV_SIGNAL:
case SIGEV_THREAD:
- if (sig <= 0 || sig > SIGRTMAX ||
- sig_kernel_only(sig) || sig_kernel_coredump(sig))
+ if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX)
return NULL;
/* FALLTHRU */
case SIGEV_NONE:
diff --git a/localversion-rt b/localversion-rt
index 22746d6390a4..d79dde624aaa 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt9
+-rt10
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