Dear RT folks!
I'm pleased to announce the v4.16.15-rt7 patch set.
Changes since v4.16.15-rt6:
- Add the mm/memcontro pach back to fix a "sleeping while atomic"
warning. It was dropped in the v4.16 cycle because it was wrongly
assumed that it is not longer required. Reported by Mike Galbraith.
- Add a percpu_ida fix from upstream.
- Drop the patch for the X86 Ultraviolet platform. It should be merged
upstream because PREEMPT causes warnings, too. This is not going to
happen so I drop it from RT since nobody cares.
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 v4.16.15-rt6 is appended below and can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.16/incr/patch-4.16.15-rt6-rt7.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
v4.16.15-rt7
The RT patch against v4.16.15 can be found here:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.16/older/patch-4.16.15-rt7.patch.xz
The split quilt queue is available at:
https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.16/older/patches-4.16.15-rt7.tar.xz
Sebastian
diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h
index 2242c3ae1bb6..7803114aa140 100644
--- a/arch/x86/include/asm/uv/uv_bau.h
+++ b/arch/x86/include/asm/uv/uv_bau.h
@@ -642,9 +642,9 @@ struct bau_control {
cycles_t send_message;
cycles_t period_end;
cycles_t period_time;
- raw_spinlock_t uvhub_lock;
- raw_spinlock_t queue_lock;
- raw_spinlock_t disable_lock;
+ spinlock_t uvhub_lock;
+ spinlock_t queue_lock;
+ spinlock_t disable_lock;
/* tunables */
int max_concurr;
int max_concurr_const;
@@ -846,15 +846,15 @@ static inline int atom_asr(short i, struct atomic_short
*v)
* to be lowered below the current 'v'. atomic_add_unless can only stop
* on equal.
*/
-static inline int atomic_inc_unless_ge(raw_spinlock_t *lock, atomic_t *v, int
u)
+static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
{
- raw_spin_lock(lock);
+ spin_lock(lock);
if (atomic_read(v) >= u) {
- raw_spin_unlock(lock);
+ spin_unlock(lock);
return 0;
}
atomic_inc(v);
- raw_spin_unlock(lock);
+ spin_unlock(lock);
return 1;
}
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index ca74e1e24dcd..b36caae0fb2f 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -740,9 +740,9 @@ static void destination_plugged(struct bau_desc *bau_desc,
quiesce_local_uvhub(hmaster);
- raw_spin_lock(&hmaster->queue_lock);
+ spin_lock(&hmaster->queue_lock);
reset_with_ipi(&bau_desc->distribution, bcp);
- raw_spin_unlock(&hmaster->queue_lock);
+ spin_unlock(&hmaster->queue_lock);
end_uvhub_quiesce(hmaster);
@@ -762,9 +762,9 @@ static void destination_timeout(struct bau_desc *bau_desc,
quiesce_local_uvhub(hmaster);
- raw_spin_lock(&hmaster->queue_lock);
+ spin_lock(&hmaster->queue_lock);
reset_with_ipi(&bau_desc->distribution, bcp);
- raw_spin_unlock(&hmaster->queue_lock);
+ spin_unlock(&hmaster->queue_lock);
end_uvhub_quiesce(hmaster);
@@ -785,7 +785,7 @@ static void disable_for_period(struct bau_control *bcp,
struct ptc_stats *stat)
cycles_t tm1;
hmaster = bcp->uvhub_master;
- raw_spin_lock(&hmaster->disable_lock);
+ spin_lock(&hmaster->disable_lock);
if (!bcp->baudisabled) {
stat->s_bau_disabled++;
tm1 = get_cycles();
@@ -798,7 +798,7 @@ static void disable_for_period(struct bau_control *bcp,
struct ptc_stats *stat)
}
}
}
- raw_spin_unlock(&hmaster->disable_lock);
+ spin_unlock(&hmaster->disable_lock);
}
static void count_max_concurr(int stat, struct bau_control *bcp,
@@ -861,7 +861,7 @@ static void record_send_stats(cycles_t time1, cycles_t
time2,
*/
static void uv1_throttle(struct bau_control *hmaster, struct ptc_stats *stat)
{
- raw_spinlock_t *lock = &hmaster->uvhub_lock;
+ spinlock_t *lock = &hmaster->uvhub_lock;
atomic_t *v;
v = &hmaster->active_descriptor_count;
@@ -995,7 +995,7 @@ static int check_enable(struct bau_control *bcp, struct
ptc_stats *stat)
struct bau_control *hmaster;
hmaster = bcp->uvhub_master;
- raw_spin_lock(&hmaster->disable_lock);
+ spin_lock(&hmaster->disable_lock);
if (bcp->baudisabled && (get_cycles() >= bcp->set_bau_on_time)) {
stat->s_bau_reenabled++;
for_each_present_cpu(tcpu) {
@@ -1007,10 +1007,10 @@ static int check_enable(struct bau_control *bcp, struct
ptc_stats *stat)
tbcp->period_giveups = 0;
}
}
- raw_spin_unlock(&hmaster->disable_lock);
+ spin_unlock(&hmaster->disable_lock);
return 0;
}
- raw_spin_unlock(&hmaster->disable_lock);
+ spin_unlock(&hmaster->disable_lock);
return -1;
}
@@ -1942,9 +1942,9 @@ static void __init init_per_cpu_tunables(void)
bcp->cong_reps = congested_reps;
bcp->disabled_period = sec_2_cycles(disabled_period);
bcp->giveup_limit = giveup_limit;
- raw_spin_lock_init(&bcp->queue_lock);
- raw_spin_lock_init(&bcp->uvhub_lock);
- raw_spin_lock_init(&bcp->disable_lock);
+ spin_lock_init(&bcp->queue_lock);
+ spin_lock_init(&bcp->uvhub_lock);
+ spin_lock_init(&bcp->disable_lock);
}
}
diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c
index badf377efc21..b082d71b08ee 100644
--- a/arch/x86/platform/uv/uv_time.c
+++ b/arch/x86/platform/uv/uv_time.c
@@ -57,7 +57,7 @@ static DEFINE_PER_CPU(struct clock_event_device, cpu_ced);
/* There is one of these allocated per node */
struct uv_rtc_timer_head {
- raw_spinlock_t lock;
+ spinlock_t lock;
/* next cpu waiting for timer, local node relative: */
int next_cpu;
/* number of cpus on this node: */
@@ -177,7 +177,7 @@ static __init int uv_rtc_allocate_timers(void)
uv_rtc_deallocate_timers();
return -ENOMEM;
}
- raw_spin_lock_init(&head->lock);
+ spin_lock_init(&head->lock);
head->ncpus = uv_blade_nr_possible_cpus(bid);
head->next_cpu = -1;
blade_info[bid] = head;
@@ -231,7 +231,7 @@ static int uv_rtc_set_timer(int cpu, u64 expires)
unsigned long flags;
int next_cpu;
- raw_spin_lock_irqsave(&head->lock, flags);
+ spin_lock_irqsave(&head->lock, flags);
next_cpu = head->next_cpu;
*t = expires;
@@ -243,12 +243,12 @@ static int uv_rtc_set_timer(int cpu, u64 expires)
if (uv_setup_intr(cpu, expires)) {
*t = ULLONG_MAX;
uv_rtc_find_next_timer(head, pnode);
- raw_spin_unlock_irqrestore(&head->lock, flags);
+ spin_unlock_irqrestore(&head->lock, flags);
return -ETIME;
}
}
- raw_spin_unlock_irqrestore(&head->lock, flags);
+ spin_unlock_irqrestore(&head->lock, flags);
return 0;
}
@@ -267,7 +267,7 @@ static int uv_rtc_unset_timer(int cpu, int force)
unsigned long flags;
int rc = 0;
- raw_spin_lock_irqsave(&head->lock, flags);
+ spin_lock_irqsave(&head->lock, flags);
if ((head->next_cpu == bcpu && uv_read_rtc(NULL) >= *t) || force)
rc = 1;
@@ -279,7 +279,7 @@ static int uv_rtc_unset_timer(int cpu, int force)
uv_rtc_find_next_timer(head, pnode);
}
- raw_spin_unlock_irqrestore(&head->lock, flags);
+ spin_unlock_irqrestore(&head->lock, flags);
return rc;
}
@@ -299,17 +299,13 @@ static int uv_rtc_unset_timer(int cpu, int force)
static u64 uv_read_rtc(struct clocksource *cs)
{
unsigned long offset;
- u64 cycles;
- preempt_disable();
if (uv_get_min_hub_revision_id() == 1)
offset = 0;
else
offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE;
- cycles = (u64)uv_read_local_mmr(UVH_RTC | offset);
- preempt_enable();
- return cycles;
+ return (u64)uv_read_local_mmr(UVH_RTC | offset);
}
/*
diff --git a/lib/percpu_ida.c b/lib/percpu_ida.c
index 9bbd9c5d375a..beb14839b41a 100644
--- a/lib/percpu_ida.c
+++ b/lib/percpu_ida.c
@@ -141,7 +141,7 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state)
spin_lock_irqsave(&tags->lock, flags);
/* Fastpath */
- if (likely(tags->nr_free >= 0)) {
+ if (likely(tags->nr_free)) {
tag = tags->freelist[--tags->nr_free];
spin_unlock_irqrestore(&tags->lock, flags);
return tag;
diff --git a/localversion-rt b/localversion-rt
index 8fc605d80667..045478966e9f 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt6
+-rt7
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 93bf018af10e..82d1842ef814 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1786,7 +1786,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
* as well as workers from this path always operate on the local
* per-cpu data. CPU up doesn't touch memcg_stock at all.
*/
- curcpu = get_cpu();
+ curcpu = get_cpu_light();
for_each_online_cpu(cpu) {
struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
struct mem_cgroup *memcg;
@@ -1806,7 +1806,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
}
css_put(&memcg->css);
}
- put_cpu();
+ put_cpu_light();
mutex_unlock(&percpu_charge_mutex);
}
