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Date: Wed, 3 Feb 2021 19:03:17 +0100
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] v5.10.12-rt26
Dear RT folks!
I'm pleased to announce the v5.10.12-rt26 patch set.
Changes since v5.10.12-rt25:
- Updated the "tracing: Merge irqflags + preempt counter." patch to
the version Steven posted for upstream inclusion.
- Update the work-in-progress softirq patch. One difference is that
tasklet_disable() becomes now sleeping if the tasklet is running
instead busy-spinning until it is done. Driver which invoke the
function in atomic context on !RT have been converted.
Known issues
- kdb/kgdb can easily deadlock.
- kmsg dumpers expecting not to be called in parallel can clobber
their temp buffer.
- netconsole triggers WARN.
The delta patch against v5.10.12-rt25 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.10/incr/patch-5.10.12-rt25-rt26.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 v5.10.12-rt26
The RT patch against v5.10.12 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patch-5.10.12-rt26.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.12-rt26.tar.xz
Sebastian
diff --git a/drivers/atm/eni.c b/drivers/atm/eni.c
index 316a9947541fe..e96a4e8a4a10c 100644
--- a/drivers/atm/eni.c
+++ b/drivers/atm/eni.c
@@ -2054,7 +2054,7 @@ static int eni_send(struct atm_vcc *vcc,struct sk_buff *skb)
}
submitted++;
ATM_SKB(skb)->vcc = vcc;
- tasklet_disable(&ENI_DEV(vcc->dev)->task);
+ tasklet_disable_in_atomic(&ENI_DEV(vcc->dev)->task);
res = do_tx(skb);
tasklet_enable(&ENI_DEV(vcc->dev)->task);
if (res == enq_ok) return 0;
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 9811c40956e54..17c9d825188bb 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2545,7 +2545,7 @@ static int ohci_cancel_packet(struct fw_card *card, struct fw_packet *packet)
struct driver_data *driver_data = packet->driver_data;
int ret = -ENOENT;
- tasklet_disable(&ctx->tasklet);
+ tasklet_disable_in_atomic(&ctx->tasklet);
if (packet->ack != 0)
goto out;
@@ -3465,7 +3465,7 @@ static int ohci_flush_iso_completions(struct fw_iso_context *base)
struct iso_context *ctx = container_of(base, struct iso_context, base);
int ret = 0;
- tasklet_disable(&ctx->context.tasklet);
+ tasklet_disable_in_atomic(&ctx->context.tasklet);
if (!test_and_set_bit_lock(0, &ctx->flushing_completions)) {
context_tasklet((unsigned long)&ctx->context);
diff --git a/drivers/net/arcnet/arc-rimi.c b/drivers/net/arcnet/arc-rimi.c
index 98df38fe553ce..12d085405bd05 100644
--- a/drivers/net/arcnet/arc-rimi.c
+++ b/drivers/net/arcnet/arc-rimi.c
@@ -332,7 +332,7 @@ static int __init arc_rimi_init(void)
dev->irq = 9;
if (arcrimi_probe(dev)) {
- free_netdev(dev);
+ free_arcdev(dev);
return -EIO;
}
@@ -349,7 +349,7 @@ static void __exit arc_rimi_exit(void)
iounmap(lp->mem_start);
release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
free_irq(dev->irq, dev);
- free_netdev(dev);
+ free_arcdev(dev);
}
#ifndef MODULE
diff --git a/drivers/net/arcnet/arcdevice.h b/drivers/net/arcnet/arcdevice.h
index 22a49c6d7ae6e..5d4a4c7efbbff 100644
--- a/drivers/net/arcnet/arcdevice.h
+++ b/drivers/net/arcnet/arcdevice.h
@@ -298,6 +298,10 @@ struct arcnet_local {
int excnak_pending; /* We just got an excesive nak interrupt */
+ /* RESET flag handling */
+ int reset_in_progress;
+ struct work_struct reset_work;
+
struct {
uint16_t sequence; /* sequence number (incs with each packet) */
__be16 aborted_seq;
@@ -350,7 +354,9 @@ void arcnet_dump_skb(struct net_device *dev, struct sk_buff *skb, char *desc)
void arcnet_unregister_proto(struct ArcProto *proto);
irqreturn_t arcnet_interrupt(int irq, void *dev_id);
+
struct net_device *alloc_arcdev(const char *name);
+void free_arcdev(struct net_device *dev);
int arcnet_open(struct net_device *dev);
int arcnet_close(struct net_device *dev);
diff --git a/drivers/net/arcnet/arcnet.c b/drivers/net/arcnet/arcnet.c
index e04efc0a5c977..d76dd7d14299e 100644
--- a/drivers/net/arcnet/arcnet.c
+++ b/drivers/net/arcnet/arcnet.c
@@ -387,10 +387,44 @@ static void arcnet_timer(struct timer_list *t)
struct arcnet_local *lp = from_timer(lp, t, timer);
struct net_device *dev = lp->dev;
- if (!netif_carrier_ok(dev)) {
+ spin_lock_irq(&lp->lock);
+
+ if (!lp->reset_in_progress && !netif_carrier_ok(dev)) {
netif_carrier_on(dev);
netdev_info(dev, "link up\n");
}
+
+ spin_unlock_irq(&lp->lock);
+}
+
+static void reset_device_work(struct work_struct *work)
+{
+ struct arcnet_local *lp;
+ struct net_device *dev;
+
+ lp = container_of(work, struct arcnet_local, reset_work);
+ dev = lp->dev;
+
+ /* Do not bring the network interface back up if an ifdown
+ * was already done.
+ */
+ if (!netif_running(dev) || !lp->reset_in_progress)
+ return;
+
+ rtnl_lock();
+
+ /* Do another check, in case of an ifdown that was triggered in
+ * the small race window between the exit condition above and
+ * acquiring RTNL.
+ */
+ if (!netif_running(dev) || !lp->reset_in_progress)
+ goto out;
+
+ dev_close(dev);
+ dev_open(dev, NULL);
+
+out:
+ rtnl_unlock();
}
static void arcnet_reply_tasklet(unsigned long data)
@@ -452,12 +486,25 @@ struct net_device *alloc_arcdev(const char *name)
lp->dev = dev;
spin_lock_init(&lp->lock);
timer_setup(&lp->timer, arcnet_timer, 0);
+ INIT_WORK(&lp->reset_work, reset_device_work);
}
return dev;
}
EXPORT_SYMBOL(alloc_arcdev);
+void free_arcdev(struct net_device *dev)
+{
+ struct arcnet_local *lp = netdev_priv(dev);
+
+ /* Do not cancel this at ->ndo_close(), as the workqueue itself
+ * indirectly calls the ifdown path through dev_close().
+ */
+ cancel_work_sync(&lp->reset_work);
+ free_netdev(dev);
+}
+EXPORT_SYMBOL(free_arcdev);
+
/* Open/initialize the board. This is called sometime after booting when
* the 'ifconfig' program is run.
*
@@ -587,6 +634,10 @@ int arcnet_close(struct net_device *dev)
/* shut down the card */
lp->hw.close(dev);
+
+ /* reset counters */
+ lp->reset_in_progress = 0;
+
module_put(lp->hw.owner);
return 0;
}
@@ -820,6 +871,9 @@ irqreturn_t arcnet_interrupt(int irq, void *dev_id)
spin_lock_irqsave(&lp->lock, flags);
+ if (lp->reset_in_progress)
+ goto out;
+
/* RESET flag was enabled - if device is not running, we must
* clear it right away (but nothing else).
*/
@@ -852,11 +906,14 @@ irqreturn_t arcnet_interrupt(int irq, void *dev_id)
if (status & RESETflag) {
arc_printk(D_NORMAL, dev, "spurious reset (status=%Xh)\n",
status);
- arcnet_close(dev);
- arcnet_open(dev);
+
+ lp->reset_in_progress = 1;
+ netif_stop_queue(dev);
+ netif_carrier_off(dev);
+ schedule_work(&lp->reset_work);
/* get out of the interrupt handler! */
- break;
+ goto out;
}
/* RX is inhibited - we must have received something.
* Prepare to receive into the next buffer.
@@ -1052,6 +1109,7 @@ irqreturn_t arcnet_interrupt(int irq, void *dev_id)
udelay(1);
lp->hw.intmask(dev, lp->intmask);
+out:
spin_unlock_irqrestore(&lp->lock, flags);
return retval;
}
diff --git a/drivers/net/arcnet/com20020-isa.c b/drivers/net/arcnet/com20020-isa.c
index f983c4ce6b07f..be618e4b9ed5e 100644
--- a/drivers/net/arcnet/com20020-isa.c
+++ b/drivers/net/arcnet/com20020-isa.c
@@ -169,7 +169,7 @@ static int __init com20020_init(void)
dev->irq = 9;
if (com20020isa_probe(dev)) {
- free_netdev(dev);
+ free_arcdev(dev);
return -EIO;
}
@@ -182,7 +182,7 @@ static void __exit com20020_exit(void)
unregister_netdev(my_dev);
free_irq(my_dev->irq, my_dev);
release_region(my_dev->base_addr, ARCNET_TOTAL_SIZE);
- free_netdev(my_dev);
+ free_arcdev(my_dev);
}
#ifndef MODULE
diff --git a/drivers/net/arcnet/com20020-pci.c b/drivers/net/arcnet/com20020-pci.c
index eb7f76753c9c0..8bdc44b7e09a1 100644
--- a/drivers/net/arcnet/com20020-pci.c
+++ b/drivers/net/arcnet/com20020-pci.c
@@ -291,7 +291,7 @@ static void com20020pci_remove(struct pci_dev *pdev)
unregister_netdev(dev);
free_irq(dev->irq, dev);
- free_netdev(dev);
+ free_arcdev(dev);
}
}
diff --git a/drivers/net/arcnet/com20020_cs.c b/drivers/net/arcnet/com20020_cs.c
index cf607ffcf358e..9cc5eb6a8e905 100644
--- a/drivers/net/arcnet/com20020_cs.c
+++ b/drivers/net/arcnet/com20020_cs.c
@@ -177,7 +177,7 @@ static void com20020_detach(struct pcmcia_device *link)
dev = info->dev;
if (dev) {
dev_dbg(&link->dev, "kfree...\n");
- free_netdev(dev);
+ free_arcdev(dev);
}
dev_dbg(&link->dev, "kfree2...\n");
kfree(info);
diff --git a/drivers/net/arcnet/com90io.c b/drivers/net/arcnet/com90io.c
index cf214b7306715..3856b447d38ed 100644
--- a/drivers/net/arcnet/com90io.c
+++ b/drivers/net/arcnet/com90io.c
@@ -396,7 +396,7 @@ static int __init com90io_init(void)
err = com90io_probe(dev);
if (err) {
- free_netdev(dev);
+ free_arcdev(dev);
return err;
}
@@ -419,7 +419,7 @@ static void __exit com90io_exit(void)
free_irq(dev->irq, dev);
release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
- free_netdev(dev);
+ free_arcdev(dev);
}
module_init(com90io_init)
diff --git a/drivers/net/arcnet/com90xx.c b/drivers/net/arcnet/com90xx.c
index 3dc3d533cb19a..d8dfb9ea0de89 100644
--- a/drivers/net/arcnet/com90xx.c
+++ b/drivers/net/arcnet/com90xx.c
@@ -554,7 +554,7 @@ static int __init com90xx_found(int ioaddr, int airq, u_long shmem,
err_release_mem:
release_mem_region(dev->mem_start, dev->mem_end - dev->mem_start + 1);
err_free_dev:
- free_netdev(dev);
+ free_arcdev(dev);
return -EIO;
}
@@ -672,7 +672,7 @@ static void __exit com90xx_exit(void)
release_region(dev->base_addr, ARCNET_TOTAL_SIZE);
release_mem_region(dev->mem_start,
dev->mem_end - dev->mem_start + 1);
- free_netdev(dev);
+ free_arcdev(dev);
}
}
diff --git a/drivers/net/ethernet/dlink/sundance.c b/drivers/net/ethernet/dlink/sundance.c
index e3a8858915b37..df0eab479d512 100644
--- a/drivers/net/ethernet/dlink/sundance.c
+++ b/drivers/net/ethernet/dlink/sundance.c
@@ -963,7 +963,7 @@ static void tx_timeout(struct net_device *dev, unsigned int txqueue)
unsigned long flag;
netif_stop_queue(dev);
- tasklet_disable(&np->tx_tasklet);
+ tasklet_disable_in_atomic(&np->tx_tasklet);
iowrite16(0, ioaddr + IntrEnable);
printk(KERN_WARNING "%s: Transmit timed out, TxStatus %2.2x "
"TxFrameId %2.2x,"
diff --git a/drivers/net/ethernet/jme.c b/drivers/net/ethernet/jme.c
index e9efe074edc11..f1b9284e0bea8 100644
--- a/drivers/net/ethernet/jme.c
+++ b/drivers/net/ethernet/jme.c
@@ -1265,9 +1265,9 @@ jme_stop_shutdown_timer(struct jme_adapter *jme)
jwrite32f(jme, JME_APMC, apmc);
}
-static void jme_link_change_tasklet(struct tasklet_struct *t)
+static void jme_link_change_work(struct work_struct *work)
{
- struct jme_adapter *jme = from_tasklet(jme, t, linkch_task);
+ struct jme_adapter *jme = container_of(work, struct jme_adapter, linkch_task);
struct net_device *netdev = jme->dev;
int rc;
@@ -1510,7 +1510,7 @@ jme_intr_msi(struct jme_adapter *jme, u32 intrstat)
* all other events are ignored
*/
jwrite32(jme, JME_IEVE, intrstat);
- tasklet_schedule(&jme->linkch_task);
+ schedule_work(&jme->linkch_task);
goto out_reenable;
}
@@ -1832,7 +1832,6 @@ jme_open(struct net_device *netdev)
jme_clear_pm_disable_wol(jme);
JME_NAPI_ENABLE(jme);
- tasklet_setup(&jme->linkch_task, jme_link_change_tasklet);
tasklet_setup(&jme->txclean_task, jme_tx_clean_tasklet);
tasklet_setup(&jme->rxclean_task, jme_rx_clean_tasklet);
tasklet_setup(&jme->rxempty_task, jme_rx_empty_tasklet);
@@ -1920,7 +1919,7 @@ jme_close(struct net_device *netdev)
JME_NAPI_DISABLE(jme);
- tasklet_kill(&jme->linkch_task);
+ cancel_work_sync(&jme->linkch_task);
tasklet_kill(&jme->txclean_task);
tasklet_kill(&jme->rxclean_task);
tasklet_kill(&jme->rxempty_task);
@@ -3035,6 +3034,7 @@ jme_init_one(struct pci_dev *pdev,
atomic_set(&jme->rx_empty, 1);
tasklet_setup(&jme->pcc_task, jme_pcc_tasklet);
+ INIT_WORK(&jme->linkch_task, jme_link_change_work);
jme->dpi.cur = PCC_P1;
jme->reg_ghc = 0;
diff --git a/drivers/net/ethernet/jme.h b/drivers/net/ethernet/jme.h
index a2c3b00d939d0..2af76329b4a27 100644
--- a/drivers/net/ethernet/jme.h
+++ b/drivers/net/ethernet/jme.h
@@ -411,7 +411,7 @@ struct jme_adapter {
struct tasklet_struct rxempty_task;
struct tasklet_struct rxclean_task;
struct tasklet_struct txclean_task;
- struct tasklet_struct linkch_task;
+ struct work_struct linkch_task;
struct tasklet_struct pcc_task;
unsigned long flags;
u32 reg_txcs;
diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c
index 71e2ada86793f..72e2e71aac0e6 100644
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -251,7 +251,7 @@ void ath9k_beacon_ensure_primary_slot(struct ath_softc *sc)
int first_slot = ATH_BCBUF;
int slot;
- tasklet_disable(&sc->bcon_tasklet);
+ tasklet_disable_in_atomic(&sc->bcon_tasklet);
/* Find first taken slot. */
for (slot = 0; slot < ATH_BCBUF; slot++) {
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 03ed5cb1c4b25..7370cdc1abdb6 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -1458,7 +1458,7 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
* Prevents hv_pci_onchannelcallback() from running concurrently
* in the tasklet.
*/
- tasklet_disable(&channel->callback_event);
+ tasklet_disable_in_atomic(&channel->callback_event);
/*
* Since this function is called with IRQ locks held, can't
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index e65df3c95bc55..2725c6ad10af6 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -660,17 +660,14 @@ static inline int tasklet_trylock(struct tasklet_struct *t)
return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
}
-static inline void tasklet_unlock(struct tasklet_struct *t)
-{
- smp_mb__before_atomic();
- clear_bit(TASKLET_STATE_RUN, &(t)->state);
-}
-
+void tasklet_unlock(struct tasklet_struct *t);
void tasklet_unlock_wait(struct tasklet_struct *t);
+void tasklet_unlock_spin_wait(struct tasklet_struct *t);
#else
static inline int tasklet_trylock(struct tasklet_struct *t) { return 1; }
static inline void tasklet_unlock(struct tasklet_struct *t) { }
static inline void tasklet_unlock_wait(struct tasklet_struct *t) { }
+static inline void tasklet_unlock_spin_wait(struct tasklet_struct *t) { }
#endif
extern void __tasklet_schedule(struct tasklet_struct *t);
@@ -695,6 +692,17 @@ static inline void tasklet_disable_nosync(struct tasklet_struct *t)
smp_mb__after_atomic();
}
+/*
+ * Do not use in new code. There is no real reason to invoke this from
+ * atomic contexts.
+ */
+static inline void tasklet_disable_in_atomic(struct tasklet_struct *t)
+{
+ tasklet_disable_nosync(t);
+ tasklet_unlock_spin_wait(t);
+ smp_mb();
+}
+
static inline void tasklet_disable(struct tasklet_struct *t)
{
tasklet_disable_nosync(t);
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 5d08fb467f69a..89c3f7162267b 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -162,9 +162,58 @@ static inline void tracing_generic_entry_update(struct trace_entry *entry,
entry->flags = trace_ctx >> 24;
}
-unsigned int _tracing_gen_ctx_flags(unsigned long irqflags);
-unsigned int tracing_gen_ctx_flags(void);
-unsigned int tracing_gen_ctx_flags_dect(void);
+unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status);
+
+enum trace_flag_type {
+ TRACE_FLAG_IRQS_OFF = 0x01,
+ TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
+ TRACE_FLAG_NEED_RESCHED = 0x04,
+ TRACE_FLAG_HARDIRQ = 0x08,
+ TRACE_FLAG_SOFTIRQ = 0x10,
+ TRACE_FLAG_PREEMPT_RESCHED = 0x20,
+ TRACE_FLAG_NMI = 0x40,
+ TRACE_FLAG_NEED_RESCHED_LAZY = 0x80,
+};
+
+#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
+static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags)
+{
+ unsigned int irq_status = irqs_disabled_flags(irqflags) ?
+ TRACE_FLAG_IRQS_OFF : 0;
+ return tracing_gen_ctx_irq_test(irq_status);
+}
+static inline unsigned int tracing_gen_ctx(void)
+{
+ unsigned long irqflags;
+
+ local_save_flags(irqflags);
+ return tracing_gen_ctx_flags(irqflags);
+}
+#else
+
+static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags)
+{
+ return tracing_gen_ctx_irq_test(TRACE_FLAG_IRQS_NOSUPPORT);
+}
+static inline unsigned int tracing_gen_ctx(void)
+{
+ return tracing_gen_ctx_irq_test(TRACE_FLAG_IRQS_NOSUPPORT);
+}
+#endif
+
+static inline unsigned int tracing_gen_ctx_dec(void)
+{
+ unsigned int trace_ctx;
+
+ trace_ctx = tracing_gen_ctx();
+ /*
+ * Subtract one from the preeption counter if preemption is enabled,
+ * see trace_event_buffer_reserve()for details.
+ */
+ if (IS_ENABLED(CONFIG_PREEMPTION))
+ trace_ctx--;
+ return trace_ctx;
+}
struct trace_event_file;
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 08a30f7f04b55..3efa760417280 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -26,6 +26,7 @@
#include <linux/smpboot.h>
#include <linux/tick.h>
#include <linux/irq.h>
+#include <linux/wait_bit.h>
#define CREATE_TRACE_POINTS
#include <trace/events/irq.h>
@@ -150,7 +151,7 @@ static DEFINE_PER_CPU(struct softirq_ctrl, softirq_ctrl) = {
*/
bool local_bh_blocked(void)
{
- return this_cpu_read(softirq_ctrl.cnt) != 0;
+ return __this_cpu_read(softirq_ctrl.cnt) != 0;
}
void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
@@ -224,7 +225,7 @@ void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
lockdep_assert_irqs_enabled();
local_irq_save(flags);
- curcnt = this_cpu_read(softirq_ctrl.cnt);
+ curcnt = __this_cpu_read(softirq_ctrl.cnt);
/*
* If this is not reenabling soft interrupts, no point in trying to
@@ -743,6 +744,16 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
}
EXPORT_SYMBOL(__tasklet_hi_schedule);
+static inline bool tasklet_clear_sched(struct tasklet_struct *t)
+{
+ if (test_and_clear_bit(TASKLET_STATE_SCHED, &t->state)) {
+ wake_up_var(&t->state);
+ return true;
+ }
+
+ return false;
+}
+
static void tasklet_action_common(struct softirq_action *a,
struct tasklet_head *tl_head,
unsigned int softirq_nr)
@@ -762,8 +773,7 @@ static void tasklet_action_common(struct softirq_action *a,
if (tasklet_trylock(t)) {
if (!atomic_read(&t->count)) {
- if (!test_and_clear_bit(TASKLET_STATE_SCHED,
- &t->state))
+ if (!tasklet_clear_sched(t))
BUG();
if (t->use_callback)
t->callback(t);
@@ -819,8 +829,11 @@ void tasklet_init(struct tasklet_struct *t,
EXPORT_SYMBOL(tasklet_init);
#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT)
-
-void tasklet_unlock_wait(struct tasklet_struct *t)
+/*
+ * Do not use in new code. There is no real reason to invoke this from
+ * atomic contexts.
+ */
+void tasklet_unlock_spin_wait(struct tasklet_struct *t)
{
while (test_bit(TASKLET_STATE_RUN, &(t)->state)) {
if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
@@ -838,7 +851,7 @@ void tasklet_unlock_wait(struct tasklet_struct *t)
}
}
}
-EXPORT_SYMBOL(tasklet_unlock_wait);
+EXPORT_SYMBOL(tasklet_unlock_spin_wait);
#endif
void tasklet_kill(struct tasklet_struct *t)
@@ -846,29 +859,31 @@ void tasklet_kill(struct tasklet_struct *t)
if (in_interrupt())
pr_notice("Attempt to kill tasklet from interrupt\n");
- while (test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) {
- do {
- if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
- /*
- * Prevent a live lock when current
- * preempted soft interrupt processing or
- * prevents ksoftirqd from running. If the
- * tasklet runs on a different CPU then
- * this has no effect other than doing the
- * BH disable/enable dance for nothing.
- */
- local_bh_disable();
- local_bh_enable();
- } else {
- yield();
- }
- } while (test_bit(TASKLET_STATE_SCHED, &t->state));
- }
+ while (test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
+ wait_var_event(&t->state, !test_bit(TASKLET_STATE_SCHED, &t->state));
+
tasklet_unlock_wait(t);
- clear_bit(TASKLET_STATE_SCHED, &t->state);
+ tasklet_clear_sched(t);
}
EXPORT_SYMBOL(tasklet_kill);
+#ifdef CONFIG_SMP
+void tasklet_unlock(struct tasklet_struct *t)
+{
+ smp_mb__before_atomic();
+ clear_bit(TASKLET_STATE_RUN, &t->state);
+ smp_mb__after_atomic();
+ wake_up_var(&t->state);
+}
+EXPORT_SYMBOL_GPL(tasklet_unlock);
+
+void tasklet_unlock_wait(struct tasklet_struct *t)
+{
+ wait_var_event(&t->state, !test_bit(TASKLET_STATE_RUN, &t->state));
+}
+EXPORT_SYMBOL_GPL(tasklet_unlock_wait);
+#endif
+
void __init softirq_init(void)
{
int cpu;
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index d6e75c7233b1f..c300ac3375737 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -79,7 +79,7 @@ static void trace_note(struct blk_trace *bt, pid_t pid, int action,
if (blk_tracer) {
buffer = blk_tr->array_buffer.buffer;
- trace_ctx = _tracing_gen_ctx_flags(0);
+ trace_ctx = tracing_gen_ctx_flags(0);
event = trace_buffer_lock_reserve(buffer, TRACE_BLK,
sizeof(*t) + len + cgid_len,
trace_ctx);
@@ -253,7 +253,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
tracing_record_cmdline(current);
buffer = blk_tr->array_buffer.buffer;
- trace_ctx = _tracing_gen_ctx_flags(0);
+ trace_ctx = tracing_gen_ctx_flags(0);
event = trace_buffer_lock_reserve(buffer, TRACE_BLK,
sizeof(*t) + pdu_len + cgid_len,
trace_ctx);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0f9162f0c02a3..d7ce9d0ad43d5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1018,7 +1018,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
alloc = sizeof(*entry) + size + 2; /* possible \n added */
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
buffer = global_trace.array_buffer.buffer;
ring_buffer_nest_start(buffer);
event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc,
@@ -1068,7 +1068,7 @@ int __trace_bputs(unsigned long ip, const char *str)
if (unlikely(tracing_selftest_running || tracing_disabled))
return 0;
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
buffer = global_trace.array_buffer.buffer;
ring_buffer_nest_start(buffer);
@@ -2587,20 +2587,13 @@ static unsigned short migration_disable_value(void)
#endif
}
-unsigned int _tracing_gen_ctx_flags(unsigned long irqflags)
+unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status)
{
- unsigned int trace_flags = 0;
+ unsigned int trace_flags = irqs_status;
unsigned int pc;
pc = preempt_count();
-#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
- if (irqs_disabled_flags(irqflags))
- trace_flags |= TRACE_FLAG_IRQS_OFF;
-#else
- trace_flags |= TRACE_FLAG_IRQS_NOSUPPORT;
-#endif
-
if (pc & NMI_MASK)
trace_flags |= TRACE_FLAG_NMI;
if (pc & HARDIRQ_MASK)
@@ -2619,33 +2612,6 @@ unsigned int _tracing_gen_ctx_flags(unsigned long irqflags)
(trace_flags << 24);
}
-unsigned int tracing_gen_ctx_flags(void)
-{
- unsigned long irqflags;
-
-#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
- local_save_flags(irqflags);
-#else
- irqflags = 0;
-#endif
- return _tracing_gen_ctx_flags(irqflags);
-}
-
-unsigned int tracing_gen_ctx_flags_dect(void)
-{
- unsigned int trace_ctx;
-
- trace_ctx = tracing_gen_ctx_flags();
-
- /*
- * Subtract one from the preeption counter if preemption is enabled,
- * see trace_event_buffer_reserve()for details.
- */
- if (IS_ENABLED(CONFIG_PREEMPTION))
- trace_ctx--;
- return trace_ctx;
-}
-
struct ring_buffer_event *
trace_buffer_lock_reserve(struct trace_buffer *buffer,
int type,
@@ -3090,7 +3056,7 @@ void trace_dump_stack(int skip)
skip++;
#endif
__ftrace_trace_stack(global_trace.array_buffer.buffer,
- tracing_gen_ctx_flags(), skip, NULL);
+ tracing_gen_ctx(), skip, NULL);
}
EXPORT_SYMBOL_GPL(trace_dump_stack);
@@ -3286,7 +3252,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
/* Don't pollute graph traces with trace_vprintk internals */
pause_graph_tracing();
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
preempt_disable_notrace();
tbuffer = get_trace_buf();
@@ -3348,7 +3314,7 @@ __trace_array_vprintk(struct trace_buffer *buffer,
/* Don't pollute graph traces with trace_vprintk internals */
pause_graph_tracing();
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
preempt_disable_notrace();
@@ -6718,7 +6684,7 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
buffer = tr->array_buffer.buffer;
event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size,
- tracing_gen_ctx_flags());
+ tracing_gen_ctx());
if (unlikely(!event))
/* Ring buffer disabled, return as if not open for write */
return -EBADF;
@@ -6797,7 +6763,7 @@ tracing_mark_raw_write(struct file *filp, const char __user *ubuf,
buffer = tr->array_buffer.buffer;
event = __trace_buffer_lock_reserve(buffer, TRACE_RAW_DATA, size,
- tracing_gen_ctx_flags());
+ tracing_gen_ctx());
if (!event)
/* Ring buffer disabled, return as if not open for write */
return -EBADF;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 8eca0d66d7560..2ad9faef718a2 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -136,27 +136,6 @@ struct kretprobe_trace_entry_head {
unsigned long ret_ip;
};
-/*
- * trace_flag_type is an enumeration that holds different
- * states when a trace occurs. These are:
- * IRQS_OFF - interrupts were disabled
- * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
- * NEED_RESCHED - reschedule is requested
- * HARDIRQ - inside an interrupt handler
- * SOFTIRQ - inside a softirq handler
- * NEED_RESCHED_LAZY - lazy reschedule is requested
- */
-enum trace_flag_type {
- TRACE_FLAG_IRQS_OFF = 0x01,
- TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
- TRACE_FLAG_NEED_RESCHED = 0x04,
- TRACE_FLAG_HARDIRQ = 0x08,
- TRACE_FLAG_SOFTIRQ = 0x10,
- TRACE_FLAG_PREEMPT_RESCHED = 0x20,
- TRACE_FLAG_NMI = 0x40,
- TRACE_FLAG_NEED_RESCHED_LAZY = 0x80,
-};
-
#define TRACE_BUF_SIZE 1024
struct trace_array;
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index a95b7f1fa351c..e47fdb4c92fbc 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -59,7 +59,7 @@ probe_likely_condition(struct ftrace_likely_data *f, int val, int expect)
if (atomic_read(&data->disabled))
goto out;
- trace_ctx = _tracing_gen_ctx_flags(flags);
+ trace_ctx = tracing_gen_ctx_flags(flags);
buffer = tr->array_buffer.buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_BRANCH,
sizeof(*entry), trace_ctx);
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 9409b7c6ebea1..0443dd61667b9 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -422,7 +422,7 @@ void perf_trace_buf_update(void *record, u16 type)
{
struct trace_entry *entry = record;
- tracing_generic_entry_update(entry, type, tracing_gen_ctx_flags());
+ tracing_generic_entry_update(entry, type, tracing_gen_ctx());
}
NOKPROBE_SYMBOL(perf_trace_buf_update);
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index a38d7edb2fe03..1b67c78ed04da 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -266,7 +266,7 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
* interested in the preempt_count at the time the tracepoint was
* hit, we need to subtract one to offset the increment.
*/
- fbuffer->trace_ctx = tracing_gen_ctx_flags_dect();
+ fbuffer->trace_ctx = tracing_gen_ctx_dec();
fbuffer->trace_file = trace_file;
fbuffer->event =
@@ -3681,7 +3681,7 @@ function_test_events_call(unsigned long ip, unsigned long parent_ip,
long disabled;
int cpu;
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
preempt_disable_notrace();
cpu = raw_smp_processor_id();
disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));
diff --git a/kernel/trace/trace_events_inject.c b/kernel/trace/trace_events_inject.c
index 65150c0a5e7af..c188045c5f976 100644
--- a/kernel/trace/trace_events_inject.c
+++ b/kernel/trace/trace_events_inject.c
@@ -203,7 +203,7 @@ static int parse_entry(char *str, struct trace_event_call *call, void **pentry)
return -ENOMEM;
tracing_generic_entry_update(entry, call->event.type,
- tracing_gen_ctx_flags());
+ tracing_gen_ctx());
while ((len = parse_field(str, call, &field, &val)) > 0) {
if (is_function_field(field))
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 52ab6cf49d767..9a4362c1e5f0c 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -140,7 +140,7 @@ function_trace_call(unsigned long ip, unsigned long parent_ip,
if (unlikely(!tr->function_enabled))
return;
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
preempt_disable_notrace();
bit = trace_test_and_set_recursion(TRACE_FTRACE_START, TRACE_FTRACE_MAX);
@@ -200,7 +200,7 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip,
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
- trace_ctx = _tracing_gen_ctx_flags(flags);
+ trace_ctx = tracing_gen_ctx_flags(flags);
trace_function(tr, ip, parent_ip, trace_ctx);
__trace_stack(tr, trace_ctx, STACK_SKIP);
}
@@ -407,7 +407,7 @@ static __always_inline void trace_stack(struct trace_array *tr)
{
unsigned int trace_ctx;
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
__trace_stack(tr, trace_ctx, FTRACE_STACK_SKIP);
}
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index aaa37a6a479cd..b086ba8bb3d65 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -173,7 +173,7 @@ int trace_graph_entry(struct ftrace_graph_ent *trace)
data = per_cpu_ptr(tr->array_buffer.data, cpu);
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
- trace_ctx = _tracing_gen_ctx_flags(flags);
+ trace_ctx = tracing_gen_ctx_flags(flags);
ret = __trace_graph_entry(tr, trace, trace_ctx);
} else {
ret = 0;
@@ -253,7 +253,7 @@ void trace_graph_return(struct ftrace_graph_ret *trace)
data = per_cpu_ptr(tr->array_buffer.data, cpu);
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
- trace_ctx = _tracing_gen_ctx_flags(flags);
+ trace_ctx = tracing_gen_ctx_flags(flags);
__trace_graph_return(tr, trace, trace_ctx);
}
atomic_dec(&data->disabled);
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 51bd4d74f56ce..4c01c5d8b9a7a 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -110,7 +110,7 @@ static void trace_hwlat_sample(struct hwlat_sample *sample)
struct hwlat_entry *entry;
event = trace_buffer_lock_reserve(buffer, TRACE_HWLAT, sizeof(*entry),
- tracing_gen_ctx_flags());
+ tracing_gen_ctx());
if (!event)
return;
entry = ring_buffer_event_data(event);
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 94219730dda2b..c463e69fb5c71 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -148,7 +148,7 @@ irqsoff_tracer_call(unsigned long ip, unsigned long parent_ip,
if (!func_prolog_dec(tr, &data, &flags))
return;
- trace_ctx = _tracing_gen_ctx_flags(flags);
+ trace_ctx = tracing_gen_ctx_flags(flags);
trace_function(tr, ip, parent_ip, trace_ctx);
@@ -198,7 +198,7 @@ static int irqsoff_graph_entry(struct ftrace_graph_ent *trace)
if (!func_prolog_dec(tr, &data, &flags))
return 0;
- trace_ctx = _tracing_gen_ctx_flags(flags);
+ trace_ctx = tracing_gen_ctx_flags(flags);
ret = __trace_graph_entry(tr, trace, trace_ctx);
atomic_dec(&data->disabled);
@@ -217,7 +217,7 @@ static void irqsoff_graph_return(struct ftrace_graph_ret *trace)
if (!func_prolog_dec(tr, &data, &flags))
return;
- trace_ctx = _tracing_gen_ctx_flags(flags);
+ trace_ctx = tracing_gen_ctx_flags(flags);
__trace_graph_return(tr, trace, trace_ctx);
atomic_dec(&data->disabled);
}
@@ -331,7 +331,7 @@ check_critical_timing(struct trace_array *tr,
T1 = ftrace_now(cpu);
delta = T1-T0;
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
if (!report_latency(tr, delta))
goto out;
@@ -393,7 +393,7 @@ start_critical_timing(unsigned long ip, unsigned long parent_ip)
data->preempt_timestamp = ftrace_now(cpu);
data->critical_start = parent_ip ? : ip;
- __trace_function(tr, ip, parent_ip, tracing_gen_ctx_flags());
+ __trace_function(tr, ip, parent_ip, tracing_gen_ctx());
per_cpu(tracing_cpu, cpu) = 1;
@@ -426,7 +426,7 @@ stop_critical_timing(unsigned long ip, unsigned long parent_ip)
atomic_inc(&data->disabled);
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
__trace_function(tr, ip, parent_ip, trace_ctx);
check_critical_timing(tr, data, parent_ip ? : ip, cpu);
data->critical_start = 0;
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index a9417890e7335..2bd52edc15793 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1384,7 +1384,7 @@ __kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,
if (trace_trigger_soft_disabled(trace_file))
return;
- fbuffer.trace_ctx = tracing_gen_ctx_flags();
+ fbuffer.trace_ctx = tracing_gen_ctx();
fbuffer.trace_file = trace_file;
dsize = __get_data_size(&tk->tp, regs);
@@ -1431,7 +1431,7 @@ __kretprobe_trace_func(struct trace_kprobe *tk, struct kretprobe_instance *ri,
if (trace_trigger_soft_disabled(trace_file))
return;
- fbuffer.trace_ctx = tracing_gen_ctx_flags();
+ fbuffer.trace_ctx = tracing_gen_ctx();
fbuffer.trace_file = trace_file;
dsize = __get_data_size(&tk->tp, regs);
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index 5a7d37bf6888c..7221ae0b4c477 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -302,7 +302,7 @@ static void __trace_mmiotrace_rw(struct trace_array *tr,
struct trace_mmiotrace_rw *entry;
unsigned int trace_ctx;
- trace_ctx = _tracing_gen_ctx_flags(0);
+ trace_ctx = tracing_gen_ctx_flags(0);
event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_RW,
sizeof(*entry), trace_ctx);
if (!event) {
@@ -333,7 +333,7 @@ static void __trace_mmiotrace_map(struct trace_array *tr,
struct trace_mmiotrace_map *entry;
unsigned int trace_ctx;
- trace_ctx = _tracing_gen_ctx_flags(0);
+ trace_ctx = tracing_gen_ctx_flags(0);
event = trace_buffer_lock_reserve(buffer, TRACE_MMIO_MAP,
sizeof(*entry), trace_ctx);
if (!event) {
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index e8bb2d8149e63..f1c603358ff33 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -75,7 +75,7 @@ func_prolog_preempt_disable(struct trace_array *tr,
if (likely(!wakeup_task))
return 0;
- *trace_ctx = tracing_gen_ctx_flags();
+ *trace_ctx = tracing_gen_ctx();
preempt_disable_notrace();
cpu = raw_smp_processor_id();
@@ -459,7 +459,7 @@ probe_wakeup_sched_switch(void *ignore, bool preempt,
goto out;
local_irq_save(flags);
- trace_ctx = _tracing_gen_ctx_flags(flags);
+ trace_ctx = tracing_gen_ctx_flags(flags);
arch_spin_lock(&wakeup_lock);
@@ -550,7 +550,7 @@ probe_wakeup(void *ignore, struct task_struct *p)
if (unlikely(disabled != 1))
goto out;
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
/* interrupts should be off from try_to_wake_up */
arch_spin_lock(&wakeup_lock);
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 71a2e705970f0..8bfcd3b094226 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -321,7 +321,7 @@ static void ftrace_syscall_enter(void *data, struct pt_regs *regs, long id)
size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
buffer = tr->array_buffer.buffer;
event = trace_buffer_lock_reserve(buffer,
@@ -365,7 +365,7 @@ static void ftrace_syscall_exit(void *data, struct pt_regs *regs, long ret)
if (!sys_data)
return;
- trace_ctx = tracing_gen_ctx_flags();
+ trace_ctx = tracing_gen_ctx();
buffer = tr->array_buffer.buffer;
event = trace_buffer_lock_reserve(buffer,
diff --git a/localversion-rt b/localversion-rt
index c5b71f9a229d5..2e9afd4a0afd3 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt25
+-rt26
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