[ANNOUNCE] 4.1.27-rt31

From: Steven Rostedt
Date: Thu Jul 14 2016 - 10:57:31 EST


Dear RT Folks,

I'm pleased to announce the 4.1.27-rt31 stable release.


You can get this release via the git tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git

branch: v4.1-rt
Head SHA1: 19f31cf0a5e2c6c52d7b0ca781121d774a103041


Or to build 4.1.27-rt31 directly, the following patches should be applied:

http://www.kernel.org/pub/linux/kernel/v3.x/linux-4.1.tar.xz

http://www.kernel.org/pub/linux/kernel/v3.x/patch-4.1.27.xz

http://www.kernel.org/pub/linux/kernel/projects/rt/4.1/patch-4.1.27-rt31.patch.xz



You can also build from 4.1.27-rt30 by applying the incremental patch:

http://www.kernel.org/pub/linux/kernel/projects/rt/4.1/incr/patch-4.1.27-rt30-rt31.patch.xz



Enjoy,

-- Steve


Changes from v4.1.27-rt30:

---

Alexandre Belloni (5):
ARM: at91: pm: simply call at91_pm_init
ARM: at91: pm: find and remap the pmc
ARM: at91: pm: move idle functions to pm.c
ARM: at91: remove useless includes and function prototypes
usb: gadget: atmel: access the PMC using regmap

Josh Cartwright (1):
list_bl: fixup bogus lockdep warning

Luiz Capitulino (1):
mm: perform lru_add_drain_all() remotely

Mike Galbraith (2):
mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object()
drivers/block/zram: Replace bit spinlocks with rtmutex for -rt

Peter Zijlstra (1):
sched,preempt: Fix preempt_count manipulations

Rik van Riel (1):
kvm, rt: change async pagefault code locking for PREEMPT_RT

Sebastian Andrzej Siewior (6):
net: dev: always take qdisc's busylock in __dev_xmit_skb()
drivers/block/zram: fixup compile for !RT
kernel/printk: Don't try to print from IRQ/NMI region
arm: lazy preempt: correct resched condition
locallock: add local_lock_on()
trace: correct off by one while recording the trace-event

Steven Rostedt (Red Hat) (1):
Linux 4.1.27-rt31

Thomas Gleixner (1):
perf/x86/intel/rapl: Make PMU lock raw

----
arch/arm/kernel/entry-armv.S | 6 ++-
arch/arm/mach-at91/at91rm9200.c | 2 -
arch/arm/mach-at91/at91sam9.c | 2 -
arch/arm/mach-at91/generic.h | 13 +-----
arch/arm/mach-at91/pm.c | 70 ++++++++++++++++++++++++-----
arch/arm/mach-at91/sama5.c | 2 +-
arch/x86/kernel/cpu/perf_event_intel_rapl.c | 20 ++++-----
arch/x86/kernel/kvm.c | 37 +++++++--------
drivers/block/zram/zram_drv.c | 30 +++++++------
drivers/block/zram/zram_drv.h | 41 +++++++++++++++++
drivers/clk/at91/pmc.c | 15 -------
drivers/usb/gadget/udc/atmel_usba_udc.c | 20 ++++-----
drivers/usb/gadget/udc/atmel_usba_udc.h | 2 +
include/asm-generic/preempt.h | 4 +-
include/linux/list_bl.h | 12 ++---
include/linux/locallock.h | 6 +++
kernel/printk/printk.c | 10 +++++
kernel/trace/trace_events.c | 8 ++++
localversion-rt | 2 +-
mm/swap.c | 37 ++++++++++++---
mm/zsmalloc.c | 4 +-
net/core/dev.c | 4 ++
22 files changed, 235 insertions(+), 112 deletions(-)
---------------------------
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index e0ca45754231..797a13d959b7 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -237,7 +237,11 @@ svc_preempt:
bne 1b
tst r0, #_TIF_NEED_RESCHED_LAZY
reteq r8 @ go again
- b 1b
+ ldr r0, [tsk, #TI_PREEMPT_LAZY] @ get preempt lazy count
+ teq r0, #0 @ if preempt lazy count != 0
+ beq 1b
+ ret r8 @ go again
+
#endif

__und_fault:
diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c
index eaf58f88ef5d..8d3cb458a99c 100644
--- a/arch/arm/mach-at91/at91rm9200.c
+++ b/arch/arm/mach-at91/at91rm9200.c
@@ -13,7 +13,6 @@
#include <linux/of_platform.h>

#include <asm/mach/arch.h>
-#include <asm/system_misc.h>

#include "generic.h"
#include "soc.h"
@@ -34,7 +33,6 @@ static void __init at91rm9200_dt_device_init(void)

of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);

- arm_pm_idle = at91rm9200_idle;
at91rm9200_pm_init();
}

diff --git a/arch/arm/mach-at91/at91sam9.c b/arch/arm/mach-at91/at91sam9.c
index e47a2093a0e7..d2bede665a1b 100644
--- a/arch/arm/mach-at91/at91sam9.c
+++ b/arch/arm/mach-at91/at91sam9.c
@@ -62,8 +62,6 @@ static void __init at91sam9_common_init(void)
soc_dev = soc_device_to_device(soc);

of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
-
- arm_pm_idle = at91sam9_idle;
}

static void __init at91sam9_dt_device_init(void)
diff --git a/arch/arm/mach-at91/generic.h b/arch/arm/mach-at91/generic.h
index b0fa7dc7286d..28ca57a2060f 100644
--- a/arch/arm/mach-at91/generic.h
+++ b/arch/arm/mach-at91/generic.h
@@ -11,27 +11,18 @@
#ifndef _AT91_GENERIC_H
#define _AT91_GENERIC_H

-#include <linux/of.h>
-#include <linux/reboot.h>
-
- /* Map io */
-extern void __init at91_map_io(void);
-extern void __init at91_alt_map_io(void);
-
-/* idle */
-extern void at91rm9200_idle(void);
-extern void at91sam9_idle(void);
-
#ifdef CONFIG_PM
extern void __init at91rm9200_pm_init(void);
extern void __init at91sam9260_pm_init(void);
extern void __init at91sam9g45_pm_init(void);
extern void __init at91sam9x5_pm_init(void);
+extern void __init sama5_pm_init(void);
#else
static inline void __init at91rm9200_pm_init(void) { }
static inline void __init at91sam9260_pm_init(void) { }
static inline void __init at91sam9g45_pm_init(void) { }
static inline void __init at91sam9x5_pm_init(void) { }
+static inline void __init sama5_pm_init(void) { }
#endif

#endif /* _AT91_GENERIC_H */
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 5062699cbb12..3be82cf983dd 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -31,10 +31,13 @@
#include <asm/mach/irq.h>
#include <asm/fncpy.h>
#include <asm/cacheflush.h>
+#include <asm/system_misc.h>

#include "generic.h"
#include "pm.h"

+static void __iomem *pmc;
+
/*
* FIXME: this is needed to communicate between the pinctrl driver and
* the PM implementation in the machine. Possibly part of the PM
@@ -85,7 +88,7 @@ static int at91_pm_verify_clocks(void)
unsigned long scsr;
int i;

- scsr = at91_pmc_read(AT91_PMC_SCSR);
+ scsr = readl(pmc + AT91_PMC_SCSR);

/* USB must not be using PLLB */
if ((scsr & at91_pm_data.uhp_udp_mask) != 0) {
@@ -99,8 +102,7 @@ static int at91_pm_verify_clocks(void)

if ((scsr & (AT91_PMC_PCK0 << i)) == 0)
continue;
-
- css = at91_pmc_read(AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
+ css = readl(pmc + AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
if (css != AT91_PMC_CSS_SLOW) {
pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);
return 0;
@@ -143,8 +145,8 @@ static void at91_pm_suspend(suspend_state_t state)
flush_cache_all();
outer_disable();

- at91_suspend_sram_fn(at91_pmc_base, at91_ramc_base[0],
- at91_ramc_base[1], pm_data);
+ at91_suspend_sram_fn(pmc, at91_ramc_base[0],
+ at91_ramc_base[1], pm_data);

outer_resume();
}
@@ -348,6 +350,21 @@ static __init void at91_dt_ramc(void)
at91_pm_set_standby(standby);
}

+void at91rm9200_idle(void)
+{
+ /*
+ * Disable the processor clock. The processor will be automatically
+ * re-enabled by an interrupt or by a reset.
+ */
+ writel(AT91_PMC_PCK, pmc + AT91_PMC_SCDR);
+}
+
+void at91sam9_idle(void)
+{
+ writel(AT91_PMC_PCK, pmc + AT91_PMC_SCDR);
+ cpu_do_idle();
+}
+
static void __init at91_pm_sram_init(void)
{
struct gen_pool *sram_pool;
@@ -394,13 +411,36 @@ static void __init at91_pm_sram_init(void)
&at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
}

-static void __init at91_pm_init(void)
+static const struct of_device_id atmel_pmc_ids[] __initconst = {
+ { .compatible = "atmel,at91rm9200-pmc" },
+ { .compatible = "atmel,at91sam9260-pmc" },
+ { .compatible = "atmel,at91sam9g45-pmc" },
+ { .compatible = "atmel,at91sam9n12-pmc" },
+ { .compatible = "atmel,at91sam9x5-pmc" },
+ { .compatible = "atmel,sama5d3-pmc" },
+ { .compatible = "atmel,sama5d2-pmc" },
+ { /* sentinel */ },
+};
+
+static void __init at91_pm_init(void (*pm_idle)(void))
{
- at91_pm_sram_init();
+ struct device_node *pmc_np;

if (at91_cpuidle_device.dev.platform_data)
platform_device_register(&at91_cpuidle_device);

+ pmc_np = of_find_matching_node(NULL, atmel_pmc_ids);
+ pmc = of_iomap(pmc_np, 0);
+ if (!pmc) {
+ pr_err("AT91: PM not supported, PMC not found\n");
+ return;
+ }
+
+ if (pm_idle)
+ arm_pm_idle = pm_idle;
+
+ at91_pm_sram_init();
+
if (at91_suspend_sram_fn)
suspend_set_ops(&at91_pm_ops);
else
@@ -419,7 +459,7 @@ void __init at91rm9200_pm_init(void)
at91_pm_data.uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP;
at91_pm_data.memctrl = AT91_MEMCTRL_MC;

- at91_pm_init();
+ at91_pm_init(at91rm9200_idle);
}

void __init at91sam9260_pm_init(void)
@@ -427,7 +467,7 @@ void __init at91sam9260_pm_init(void)
at91_dt_ramc();
at91_pm_data.memctrl = AT91_MEMCTRL_SDRAMC;
at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
- return at91_pm_init();
+ at91_pm_init(at91sam9_idle);
}

void __init at91sam9g45_pm_init(void)
@@ -435,7 +475,7 @@ void __init at91sam9g45_pm_init(void)
at91_dt_ramc();
at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP;
at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
- return at91_pm_init();
+ at91_pm_init(at91sam9_idle);
}

void __init at91sam9x5_pm_init(void)
@@ -443,5 +483,13 @@ void __init at91sam9x5_pm_init(void)
at91_dt_ramc();
at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
- return at91_pm_init();
+ at91_pm_init(at91sam9_idle);
+}
+
+void __init sama5_pm_init(void)
+{
+ at91_dt_ramc();
+ at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
+ at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
+ at91_pm_init(NULL);
}
diff --git a/arch/arm/mach-at91/sama5.c b/arch/arm/mach-at91/sama5.c
index 41d829d8e7d5..3755da6decf5 100644
--- a/arch/arm/mach-at91/sama5.c
+++ b/arch/arm/mach-at91/sama5.c
@@ -49,7 +49,7 @@ static void __init sama5_dt_device_init(void)
soc_dev = soc_device_to_device(soc);

of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
- at91sam9x5_pm_init();
+ sama5_pm_init();
}

static const char *sama5_dt_board_compat[] __initconst = {
diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
index 358c54ad20d4..94689f19ad92 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -119,7 +119,7 @@ static struct perf_pmu_events_attr event_attr_##v = { \
};

struct rapl_pmu {
- spinlock_t lock;
+ raw_spinlock_t lock;
int n_active; /* number of active events */
struct list_head active_list;
struct pmu *pmu; /* pointer to rapl_pmu_class */
@@ -223,13 +223,13 @@ static enum hrtimer_restart rapl_hrtimer_handle(struct hrtimer *hrtimer)
if (!pmu->n_active)
return HRTIMER_NORESTART;

- spin_lock_irqsave(&pmu->lock, flags);
+ raw_spin_lock_irqsave(&pmu->lock, flags);

list_for_each_entry(event, &pmu->active_list, active_entry) {
rapl_event_update(event);
}

- spin_unlock_irqrestore(&pmu->lock, flags);
+ raw_spin_unlock_irqrestore(&pmu->lock, flags);

hrtimer_forward_now(hrtimer, pmu->timer_interval);

@@ -266,9 +266,9 @@ static void rapl_pmu_event_start(struct perf_event *event, int mode)
struct rapl_pmu *pmu = __this_cpu_read(rapl_pmu);
unsigned long flags;

- spin_lock_irqsave(&pmu->lock, flags);
+ raw_spin_lock_irqsave(&pmu->lock, flags);
__rapl_pmu_event_start(pmu, event);
- spin_unlock_irqrestore(&pmu->lock, flags);
+ raw_spin_unlock_irqrestore(&pmu->lock, flags);
}

static void rapl_pmu_event_stop(struct perf_event *event, int mode)
@@ -277,7 +277,7 @@ static void rapl_pmu_event_stop(struct perf_event *event, int mode)
struct hw_perf_event *hwc = &event->hw;
unsigned long flags;

- spin_lock_irqsave(&pmu->lock, flags);
+ raw_spin_lock_irqsave(&pmu->lock, flags);

/* mark event as deactivated and stopped */
if (!(hwc->state & PERF_HES_STOPPED)) {
@@ -302,7 +302,7 @@ static void rapl_pmu_event_stop(struct perf_event *event, int mode)
hwc->state |= PERF_HES_UPTODATE;
}

- spin_unlock_irqrestore(&pmu->lock, flags);
+ raw_spin_unlock_irqrestore(&pmu->lock, flags);
}

static int rapl_pmu_event_add(struct perf_event *event, int mode)
@@ -311,14 +311,14 @@ static int rapl_pmu_event_add(struct perf_event *event, int mode)
struct hw_perf_event *hwc = &event->hw;
unsigned long flags;

- spin_lock_irqsave(&pmu->lock, flags);
+ raw_spin_lock_irqsave(&pmu->lock, flags);

hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;

if (mode & PERF_EF_START)
__rapl_pmu_event_start(pmu, event);

- spin_unlock_irqrestore(&pmu->lock, flags);
+ raw_spin_unlock_irqrestore(&pmu->lock, flags);

return 0;
}
@@ -594,7 +594,7 @@ static int rapl_cpu_prepare(int cpu)
pmu = kzalloc_node(sizeof(*pmu), GFP_KERNEL, cpu_to_node(cpu));
if (!pmu)
return -1;
- spin_lock_init(&pmu->lock);
+ raw_spin_lock_init(&pmu->lock);

INIT_LIST_HEAD(&pmu->active_list);

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 9435620062df..ba97b5b45879 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -36,6 +36,7 @@
#include <linux/kprobes.h>
#include <linux/debugfs.h>
#include <linux/nmi.h>
+#include <linux/wait-simple.h>
#include <asm/timer.h>
#include <asm/cpu.h>
#include <asm/traps.h>
@@ -91,14 +92,14 @@ static void kvm_io_delay(void)

struct kvm_task_sleep_node {
struct hlist_node link;
- wait_queue_head_t wq;
+ struct swait_head wq;
u32 token;
int cpu;
bool halted;
};

static struct kvm_task_sleep_head {
- spinlock_t lock;
+ raw_spinlock_t lock;
struct hlist_head list;
} async_pf_sleepers[KVM_TASK_SLEEP_HASHSIZE];

@@ -122,17 +123,17 @@ void kvm_async_pf_task_wait(u32 token)
u32 key = hash_32(token, KVM_TASK_SLEEP_HASHBITS);
struct kvm_task_sleep_head *b = &async_pf_sleepers[key];
struct kvm_task_sleep_node n, *e;
- DEFINE_WAIT(wait);
+ DEFINE_SWAITER(wait);

rcu_irq_enter();

- spin_lock(&b->lock);
+ raw_spin_lock(&b->lock);
e = _find_apf_task(b, token);
if (e) {
/* dummy entry exist -> wake up was delivered ahead of PF */
hlist_del(&e->link);
kfree(e);
- spin_unlock(&b->lock);
+ raw_spin_unlock(&b->lock);

rcu_irq_exit();
return;
@@ -141,13 +142,13 @@ void kvm_async_pf_task_wait(u32 token)
n.token = token;
n.cpu = smp_processor_id();
n.halted = is_idle_task(current) || preempt_count() > 1;
- init_waitqueue_head(&n.wq);
+ init_swait_head(&n.wq);
hlist_add_head(&n.link, &b->list);
- spin_unlock(&b->lock);
+ raw_spin_unlock(&b->lock);

for (;;) {
if (!n.halted)
- prepare_to_wait(&n.wq, &wait, TASK_UNINTERRUPTIBLE);
+ swait_prepare(&n.wq, &wait, TASK_UNINTERRUPTIBLE);
if (hlist_unhashed(&n.link))
break;

@@ -166,7 +167,7 @@ void kvm_async_pf_task_wait(u32 token)
}
}
if (!n.halted)
- finish_wait(&n.wq, &wait);
+ swait_finish(&n.wq, &wait);

rcu_irq_exit();
return;
@@ -178,8 +179,8 @@ static void apf_task_wake_one(struct kvm_task_sleep_node *n)
hlist_del_init(&n->link);
if (n->halted)
smp_send_reschedule(n->cpu);
- else if (waitqueue_active(&n->wq))
- wake_up(&n->wq);
+ else if (swaitqueue_active(&n->wq))
+ swait_wake(&n->wq);
}

static void apf_task_wake_all(void)
@@ -189,14 +190,14 @@ static void apf_task_wake_all(void)
for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++) {
struct hlist_node *p, *next;
struct kvm_task_sleep_head *b = &async_pf_sleepers[i];
- spin_lock(&b->lock);
+ raw_spin_lock(&b->lock);
hlist_for_each_safe(p, next, &b->list) {
struct kvm_task_sleep_node *n =
hlist_entry(p, typeof(*n), link);
if (n->cpu == smp_processor_id())
apf_task_wake_one(n);
}
- spin_unlock(&b->lock);
+ raw_spin_unlock(&b->lock);
}
}

@@ -212,7 +213,7 @@ void kvm_async_pf_task_wake(u32 token)
}

again:
- spin_lock(&b->lock);
+ raw_spin_lock(&b->lock);
n = _find_apf_task(b, token);
if (!n) {
/*
@@ -225,17 +226,17 @@ again:
* Allocation failed! Busy wait while other cpu
* handles async PF.
*/
- spin_unlock(&b->lock);
+ raw_spin_unlock(&b->lock);
cpu_relax();
goto again;
}
n->token = token;
n->cpu = smp_processor_id();
- init_waitqueue_head(&n->wq);
+ init_swait_head(&n->wq);
hlist_add_head(&n->link, &b->list);
} else
apf_task_wake_one(n);
- spin_unlock(&b->lock);
+ raw_spin_unlock(&b->lock);
return;
}
EXPORT_SYMBOL_GPL(kvm_async_pf_task_wake);
@@ -486,7 +487,7 @@ void __init kvm_guest_init(void)
paravirt_ops_setup();
register_reboot_notifier(&kvm_pv_reboot_nb);
for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++)
- spin_lock_init(&async_pf_sleepers[i].lock);
+ raw_spin_lock_init(&async_pf_sleepers[i].lock);
if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF))
x86_init.irqs.trap_init = kvm_apf_trap_init;

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 6e134f4759c0..d2782d492630 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -386,6 +386,8 @@ static struct zram_meta *zram_meta_alloc(int device_id, u64 disksize)
goto out_error;
}

+ zram_meta_init_table_locks(meta, disksize);
+
return meta;

out_error:
@@ -484,12 +486,12 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
unsigned long handle;
size_t size;

- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_lock_table(&meta->table[index]);
handle = meta->table[index].handle;
size = zram_get_obj_size(meta, index);

if (!handle || zram_test_flag(meta, index, ZRAM_ZERO)) {
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_unlock_table(&meta->table[index]);
clear_page(mem);
return 0;
}
@@ -500,7 +502,7 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
else
ret = zcomp_decompress(zram->comp, cmem, size, mem);
zs_unmap_object(meta->mem_pool, handle);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_unlock_table(&meta->table[index]);

/* Should NEVER happen. Return bio error if it does. */
if (unlikely(ret)) {
@@ -520,14 +522,14 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
struct zram_meta *meta = zram->meta;
page = bvec->bv_page;

- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_lock_table(&meta->table[index]);
if (unlikely(!meta->table[index].handle) ||
zram_test_flag(meta, index, ZRAM_ZERO)) {
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_unlock_table(&meta->table[index]);
handle_zero_page(bvec);
return 0;
}
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_unlock_table(&meta->table[index]);

if (is_partial_io(bvec))
/* Use a temporary buffer to decompress the page */
@@ -622,10 +624,10 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
if (user_mem)
kunmap_atomic(user_mem);
/* Free memory associated with this sector now. */
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_lock_table(&meta->table[index]);
zram_free_page(zram, index);
zram_set_flag(meta, index, ZRAM_ZERO);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_unlock_table(&meta->table[index]);

atomic64_inc(&zram->stats.zero_pages);
ret = 0;
@@ -685,12 +687,12 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
* Free memory associated with this sector
* before overwriting unused sectors.
*/
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_lock_table(&meta->table[index]);
zram_free_page(zram, index);

meta->table[index].handle = handle;
zram_set_obj_size(meta, index, clen);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_unlock_table(&meta->table[index]);

/* Update stats */
atomic64_add(clen, &zram->stats.compr_data_size);
@@ -762,9 +764,9 @@ static void zram_bio_discard(struct zram *zram, u32 index,
}

while (n >= PAGE_SIZE) {
- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_lock_table(&meta->table[index]);
zram_free_page(zram, index);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_unlock_table(&meta->table[index]);
atomic64_inc(&zram->stats.notify_free);
index++;
n -= PAGE_SIZE;
@@ -1007,9 +1009,9 @@ static void zram_slot_free_notify(struct block_device *bdev,
zram = bdev->bd_disk->private_data;
meta = zram->meta;

- bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_lock_table(&meta->table[index]);
zram_free_page(zram, index);
- bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+ zram_unlock_table(&meta->table[index]);
atomic64_inc(&zram->stats.notify_free);
}

diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 570c598f4ce9..22c0173b00e3 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -78,6 +78,9 @@ enum zram_pageflags {
struct zram_table_entry {
unsigned long handle;
unsigned long value;
+#ifdef CONFIG_PREEMPT_RT_BASE
+ spinlock_t lock;
+#endif
};

struct zram_stats {
@@ -122,4 +125,42 @@ struct zram {
u64 disksize; /* bytes */
char compressor[10];
};
+
+#ifndef CONFIG_PREEMPT_RT_BASE
+static inline void zram_lock_table(struct zram_table_entry *table)
+{
+ bit_spin_lock(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_unlock_table(struct zram_table_entry *table)
+{
+ bit_spin_unlock(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize) { }
+#else /* CONFIG_PREEMPT_RT_BASE */
+static inline void zram_lock_table(struct zram_table_entry *table)
+{
+ spin_lock(&table->lock);
+ __set_bit(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_unlock_table(struct zram_table_entry *table)
+{
+ __clear_bit(ZRAM_ACCESS, &table->value);
+ spin_unlock(&table->lock);
+}
+
+static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize)
+{
+ size_t num_pages = disksize >> PAGE_SHIFT;
+ size_t index;
+
+ for (index = 0; index < num_pages; index++) {
+ spinlock_t *lock = &meta->table[index].lock;
+ spin_lock_init(lock);
+ }
+}
+#endif /* CONFIG_PREEMPT_RT_BASE */
+
#endif
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 3f27d21fb729..b83480f599ce 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -27,21 +27,6 @@
void __iomem *at91_pmc_base;
EXPORT_SYMBOL_GPL(at91_pmc_base);

-void at91rm9200_idle(void)
-{
- /*
- * Disable the processor clock. The processor will be automatically
- * re-enabled by an interrupt or by a reset.
- */
- at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
-}
-
-void at91sam9_idle(void)
-{
- at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
- cpu_do_idle();
-}
-
int of_at91_get_clk_range(struct device_node *np, const char *propname,
struct clk_range *range)
{
diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
index d6ca3697d3c8..ee6bc64f9656 100644
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -17,7 +17,9 @@
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/list.h>
+#include <linux/mfd/syscon.h>
#include <linux/platform_device.h>
+#include <linux/regmap.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/atmel_usba_udc.h>
@@ -1889,20 +1891,15 @@ static int atmel_usba_stop(struct usb_gadget *gadget)
#ifdef CONFIG_OF
static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
{
- unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
-
- if (is_on)
- at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
- else
- at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
+ regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
+ is_on ? AT91_PMC_BIASEN : 0);
}

static void at91sam9g45_pulse_bias(struct usba_udc *udc)
{
- unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
-
- at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
- at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
+ regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN, 0);
+ regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
+ AT91_PMC_BIASEN);
}

static const struct usba_udc_errata at91sam9rl_errata = {
@@ -1939,6 +1936,9 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
return ERR_PTR(-EINVAL);

udc->errata = match->data;
+ udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9g45-pmc");
+ if (udc->errata && IS_ERR(udc->pmc))
+ return ERR_CAST(udc->pmc);

udc->num_ep = 0;

diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.h b/drivers/usb/gadget/udc/atmel_usba_udc.h
index ea448a344767..3e1c9d589dfa 100644
--- a/drivers/usb/gadget/udc/atmel_usba_udc.h
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.h
@@ -354,6 +354,8 @@ struct usba_udc {
struct dentry *debugfs_root;
struct dentry *debugfs_regs;
#endif
+
+ struct regmap *pmc;
};

static inline struct usba_ep *to_usba_ep(struct usb_ep *ep)
diff --git a/include/asm-generic/preempt.h b/include/asm-generic/preempt.h
index b6a53e8e526a..c91d3d764c36 100644
--- a/include/asm-generic/preempt.h
+++ b/include/asm-generic/preempt.h
@@ -7,10 +7,10 @@

static __always_inline int preempt_count(void)
{
- return current_thread_info()->preempt_count;
+ return READ_ONCE(current_thread_info()->preempt_count);
}

-static __always_inline int *preempt_count_ptr(void)
+static __always_inline volatile int *preempt_count_ptr(void)
{
return &current_thread_info()->preempt_count;
}
diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h
index d8876a0cf036..017d0f1c1eb4 100644
--- a/include/linux/list_bl.h
+++ b/include/linux/list_bl.h
@@ -42,13 +42,15 @@ struct hlist_bl_node {
struct hlist_bl_node *next, **pprev;
};

-static inline void INIT_HLIST_BL_HEAD(struct hlist_bl_head *h)
-{
- h->first = NULL;
#ifdef CONFIG_PREEMPT_RT_BASE
- raw_spin_lock_init(&h->lock);
+#define INIT_HLIST_BL_HEAD(h) \
+do { \
+ (h)->first = NULL; \
+ raw_spin_lock_init(&(h)->lock); \
+} while (0)
+#else
+#define INIT_HLIST_BL_HEAD(h) (h)->first = NULL
#endif
-}

static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h)
{
diff --git a/include/linux/locallock.h b/include/linux/locallock.h
index 339ba00adb9a..0edbf192f6d1 100644
--- a/include/linux/locallock.h
+++ b/include/linux/locallock.h
@@ -66,6 +66,9 @@ static inline void __local_lock(struct local_irq_lock *lv)
#define local_lock(lvar) \
do { __local_lock(&get_local_var(lvar)); } while (0)

+#define local_lock_on(lvar, cpu) \
+ do { __local_lock(&per_cpu(lvar, cpu)); } while (0)
+
static inline int __local_trylock(struct local_irq_lock *lv)
{
if (lv->owner != current && spin_trylock_local(&lv->lock)) {
@@ -104,6 +107,9 @@ static inline void __local_unlock(struct local_irq_lock *lv)
put_local_var(lvar); \
} while (0)

+#define local_unlock_on(lvar, cpu) \
+ do { __local_unlock(&per_cpu(lvar, cpu)); } while (0)
+
static inline void __local_lock_irq(struct local_irq_lock *lv)
{
spin_lock_irqsave(&lv->lock, lv->flags);
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 899645a2ebcc..398bf2bbd3bc 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1426,6 +1426,11 @@ static void call_console_drivers(int level, const char *text, size_t len)
if (!console_drivers)
return;

+ if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
+ if (in_irq() || in_nmi())
+ return;
+ }
+
migrate_disable();
for_each_console(con) {
if (exclusive_console && con != exclusive_console)
@@ -2392,6 +2397,11 @@ void console_unblank(void)
{
struct console *c;

+ if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
+ if (in_irq() || in_nmi())
+ return;
+ }
+
/*
* console_unblank can no longer be called in interrupt context unless
* oops_in_progress is set to 1..
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 64c1ac17af8f..b83d6a4d3912 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -200,6 +200,14 @@ void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer,

local_save_flags(fbuffer->flags);
fbuffer->pc = preempt_count();
+ /*
+ * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables
+ * preemption (adding one to the preempt_count). Since we are
+ * interested in the preempt_count at the time the tracepoint was
+ * hit, we need to subtract one to offset the increment.
+ */
+ if (IS_ENABLED(CONFIG_PREEMPT))
+ fbuffer->pc--;
fbuffer->ftrace_file = ftrace_file;

fbuffer->event =
diff --git a/localversion-rt b/localversion-rt
index b72862e06be4..a68b4337d4ce 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt30
+-rt31
diff --git a/mm/swap.c b/mm/swap.c
index 1785ac603fb0..20432b7721ed 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -819,9 +819,15 @@ void lru_add_drain_cpu(int cpu)
unsigned long flags;

/* No harm done if a racing interrupt already did this */
+#ifdef CONFIG_PREEMPT_RT_BASE
+ local_lock_irqsave_on(rotate_lock, flags, cpu);
+ pagevec_move_tail(pvec);
+ local_unlock_irqrestore_on(rotate_lock, flags, cpu);
+#else
local_lock_irqsave(rotate_lock, flags);
pagevec_move_tail(pvec);
local_unlock_irqrestore(rotate_lock, flags);
+#endif
}

pvec = &per_cpu(lru_deactivate_file_pvecs, cpu);
@@ -864,12 +870,32 @@ void lru_add_drain(void)
local_unlock_cpu(swapvec_lock);
}

+
+#ifdef CONFIG_PREEMPT_RT_BASE
+static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work)
+{
+ local_lock_on(swapvec_lock, cpu);
+ lru_add_drain_cpu(cpu);
+ local_unlock_on(swapvec_lock, cpu);
+}
+
+#else
+
static void lru_add_drain_per_cpu(struct work_struct *dummy)
{
lru_add_drain();
}

static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work);
+static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work)
+{
+ struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
+
+ INIT_WORK(work, lru_add_drain_per_cpu);
+ schedule_work_on(cpu, work);
+ cpumask_set_cpu(cpu, has_work);
+}
+#endif

void lru_add_drain_all(void)
{
@@ -882,20 +908,17 @@ void lru_add_drain_all(void)
cpumask_clear(&has_work);

for_each_online_cpu(cpu) {
- struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
-
if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) ||
pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) ||
pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) ||
- need_activate_page_drain(cpu)) {
- INIT_WORK(work, lru_add_drain_per_cpu);
- schedule_work_on(cpu, work);
- cpumask_set_cpu(cpu, &has_work);
- }
+ need_activate_page_drain(cpu))
+ remote_lru_add_drain(cpu, &has_work);
}

+#ifndef CONFIG_PREEMPT_RT_BASE
for_each_cpu(cpu, &has_work)
flush_work(&per_cpu(lru_add_drain_work, cpu));
+#endif

put_online_cpus();
mutex_unlock(&lock);
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index fb1ec10ce449..e819dffd142c 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1289,7 +1289,7 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle,
class = pool->size_class[class_idx];
off = obj_idx_to_offset(page, obj_idx, class->size);

- area = &get_cpu_var(zs_map_area);
+ area = per_cpu_ptr(&zs_map_area, get_cpu_light());
area->vm_mm = mm;
if (off + class->size <= PAGE_SIZE) {
/* this object is contained entirely within a page */
@@ -1342,7 +1342,7 @@ void zs_unmap_object(struct zs_pool *pool, unsigned long handle)

__zs_unmap_object(area, pages, off, class->size);
}
- put_cpu_var(zs_map_area);
+ put_cpu_light();
unpin_tag(handle);
}
EXPORT_SYMBOL_GPL(zs_unmap_object);
diff --git a/net/core/dev.c b/net/core/dev.c
index a824c9998283..78912da59fc1 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2828,7 +2828,11 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
* This permits __QDISC___STATE_RUNNING owner to get the lock more
* often and dequeue packets faster.
*/
+#ifdef CONFIG_PREEMPT_RT_FULL
+ contended = true;
+#else
contended = qdisc_is_running(q);
+#endif
if (unlikely(contended))
spin_lock(&q->busylock);