Dear RT folks!
I'm pleased to announce the v3.12.5-rt6 patch set.
Changes since v3.12.5-rt5
- A last fix for at91 from Sami Pietikäinen. Now at91 based boards
should work again on RT.
- A fix for an ancient race (since we got sleeping spinlocks) where the
TASK_TRACED state is temporary replaced while waiting on a rw lock and
the task can't be traced anymore. It was initially reported by Alexander
Fyodorov and he also provided a patch. Based on the patch and a
testcase I was able to reproduce it and hopefully fix this. My
testcase does no longer trigger. As a result of this,
rfc-sched-rt-fix-wait_task_interactive-to-test-rt_spin_lock-state.patch
was removed from the queue which partly did the same thing.
- A clean up from Nicholas Mc Guire to use spin_unlock_wait() instead of
open coding it.
- A few migrate_disable() push downs from Nicholas Mc Guire in the
"try lock" functions. Now migrate_disable() is only called if we got
the lock so we avoid migrate_disable() + migrate_enable() dance if we
did not get the lock.
- A patch from Nicholas Mc Guire to only invoke migrate_disable() on the
first invocation of local_bh_disable(). That means in nested
invocations of local_bh_disable() we invoke migrate_disable() only
once.
- A few Sparc64 patches from Allen Pais. According to his email he
tested it on UltraSparc T4 (Niagara4).
- Nicholas Mc Guire added a return value to a ww-mutex related function
in the !RT case which should not be used but gcc complained anyway.
Known issues:
- bcache is disabled.
- Brian Silverman reported a BUG (via Debian BTS) where gdb's
record command does something nasty and causes a double fault on
x86-64 kernel with 32bit userland (the debugged application).
32bit and 64bit setup are not kernels are not affected. As far
as I understand the problem so far, it is limited to x86.
The delta patch against v3.12.5-rt5 is appended below and can be found
here:
https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/incr/patch-3.12.5-rt5-rt6.patch.xz
The RT patch against 3.12.5 can be found here:
https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patch-3.12.5-rt6.patch.xz
The split quilt queue is available at:
https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patches-3.12.5-rt6.tar.xz
Sebastian
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 49d5f09..da51da9 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -26,6 +26,7 @@ config SPARC
select HAVE_DMA_ATTRS
select HAVE_DMA_API_DEBUG
select HAVE_ARCH_JUMP_LABEL
+ select IRQ_FORCED_THREADING
select GENERIC_IRQ_SHOW
select ARCH_WANT_IPC_PARSE_VERSION
select USE_GENERIC_SMP_HELPERS if SMP
@@ -177,12 +178,10 @@ config NR_CPUS
source kernel/Kconfig.hz
config RWSEM_GENERIC_SPINLOCK
- bool
- default y if SPARC32
+ def_bool PREEMPT_RT_FULL
config RWSEM_XCHGADD_ALGORITHM
- bool
- default y if SPARC64
+ def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL
config GENERIC_HWEIGHT
bool
diff --git a/arch/sparc/include/asm/mmu_64.h b/arch/sparc/include/asm/mmu_64.h
index 76092c4..e945ddb 100644
--- a/arch/sparc/include/asm/mmu_64.h
+++ b/arch/sparc/include/asm/mmu_64.h
@@ -90,7 +90,7 @@ struct tsb_config {
#endif
typedef struct {
- spinlock_t lock;
+ raw_spinlock_t lock;
unsigned long sparc64_ctx_val;
unsigned long huge_pte_count;
struct page *pgtable_page;
diff --git a/arch/sparc/include/asm/mmu_context_64.h
b/arch/sparc/include/asm/mmu_context_64.h
index 3d528f0..44e393b 100644
--- a/arch/sparc/include/asm/mmu_context_64.h
+++ b/arch/sparc/include/asm/mmu_context_64.h
@@ -13,7 +13,7 @@ static inline void enter_lazy_tlb(struct mm_struct *mm,
struct task_struct *tsk)
{
}
-extern spinlock_t ctx_alloc_lock;
+extern raw_spinlock_t ctx_alloc_lock;
extern unsigned long tlb_context_cache;
extern unsigned long mmu_context_bmap[];
@@ -77,7 +77,7 @@ static inline void switch_mm(struct mm_struct *old_mm, struct
mm_struct *mm, str
if (unlikely(mm == &init_mm))
return;
- spin_lock_irqsave(&mm->context.lock, flags);
+ raw_spin_lock_irqsave(&mm->context.lock, flags);
ctx_valid = CTX_VALID(mm->context);
if (!ctx_valid)
get_new_mmu_context(mm);
@@ -125,7 +125,7 @@ static inline void switch_mm(struct mm_struct *old_mm,
struct mm_struct *mm, str
__flush_tlb_mm(CTX_HWBITS(mm->context),
SECONDARY_CONTEXT);
}
- spin_unlock_irqrestore(&mm->context.lock, flags);
+ raw_spin_unlock_irqrestore(&mm->context.lock, flags);
}
#define deactivate_mm(tsk,mm) do { } while (0)
@@ -136,7 +136,7 @@ static inline void activate_mm(struct mm_struct *active_mm,
struct mm_struct *mm
unsigned long flags;
int cpu;
- spin_lock_irqsave(&mm->context.lock, flags);
+ raw_spin_lock_irqsave(&mm->context.lock, flags);
if (!CTX_VALID(mm->context))
get_new_mmu_context(mm);
cpu = smp_processor_id();
@@ -146,7 +146,7 @@ static inline void activate_mm(struct mm_struct *active_mm,
struct mm_struct *mm
load_secondary_context(mm);
__flush_tlb_mm(CTX_HWBITS(mm->context), SECONDARY_CONTEXT);
tsb_context_switch(mm);
- spin_unlock_irqrestore(&mm->context.lock, flags);
+ raw_spin_unlock_irqrestore(&mm->context.lock, flags);
}
#endif /* !(__ASSEMBLY__) */
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index e142545..8c68424 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -976,12 +976,12 @@ void __irq_entry smp_new_mmu_context_version_client(int
irq, struct pt_regs *reg
if (unlikely(!mm || (mm == &init_mm)))
return;
- spin_lock_irqsave(&mm->context.lock, flags);
+ raw_spin_lock_irqsave(&mm->context.lock, flags);
if (unlikely(!CTX_VALID(mm->context)))
get_new_mmu_context(mm);
- spin_unlock_irqrestore(&mm->context.lock, flags);
+ raw_spin_unlock_irqrestore(&mm->context.lock, flags);
load_secondary_context(mm);
__flush_tlb_mm(CTX_HWBITS(mm->context),
diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
index ed82eda..ec995b0 100644
--- a/arch/sparc/mm/init_64.c
+++ b/arch/sparc/mm/init_64.c
@@ -350,7 +350,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned
long address, pte_t *
mm = vma->vm_mm;
- spin_lock_irqsave(&mm->context.lock, flags);
+ raw_spin_lock_irqsave(&mm->context.lock, flags);
#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
if (mm->context.huge_pte_count && is_hugetlb_pte(pte))
@@ -361,7 +361,7 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned
long address, pte_t *
__update_mmu_tsb_insert(mm, MM_TSB_BASE, PAGE_SHIFT,
address, pte_val(pte));
- spin_unlock_irqrestore(&mm->context.lock, flags);
+ raw_spin_unlock_irqrestore(&mm->context.lock, flags);
}
void flush_dcache_page(struct page *page)
@@ -661,7 +661,7 @@ void __flush_dcache_range(unsigned long start, unsigned
long end)
EXPORT_SYMBOL(__flush_dcache_range);
/* get_new_mmu_context() uses "cache + 1". */
-DEFINE_SPINLOCK(ctx_alloc_lock);
+DEFINE_RAW_SPINLOCK(ctx_alloc_lock);
unsigned long tlb_context_cache = CTX_FIRST_VERSION - 1;
#define MAX_CTX_NR (1UL << CTX_NR_BITS)
#define CTX_BMAP_SLOTS BITS_TO_LONGS(MAX_CTX_NR)
@@ -683,7 +683,7 @@ void get_new_mmu_context(struct mm_struct *mm)
unsigned long orig_pgsz_bits;
int new_version;
- spin_lock(&ctx_alloc_lock);
+ raw_spin_lock(&ctx_alloc_lock);
orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK);
ctx = (tlb_context_cache + 1) & CTX_NR_MASK;
new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx);
@@ -719,7 +719,7 @@ void get_new_mmu_context(struct mm_struct *mm)
out:
tlb_context_cache = new_ctx;
mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits;
- spin_unlock(&ctx_alloc_lock);
+ raw_spin_unlock(&ctx_alloc_lock);
if (unlikely(new_version))
smp_new_mmu_context_version();
@@ -2721,7 +2721,7 @@ void hugetlb_setup(struct pt_regs *regs)
if (tlb_type == cheetah_plus) {
unsigned long ctx;
- spin_lock(&ctx_alloc_lock);
+ raw_spin_lock(&ctx_alloc_lock);
ctx = mm->context.sparc64_ctx_val;
ctx &= ~CTX_PGSZ_MASK;
ctx |= CTX_PGSZ_BASE << CTX_PGSZ0_SHIFT;
@@ -2742,7 +2742,7 @@ void hugetlb_setup(struct pt_regs *regs)
mm->context.sparc64_ctx_val = ctx;
on_each_cpu(context_reload, mm, 0);
}
- spin_unlock(&ctx_alloc_lock);
+ raw_spin_unlock(&ctx_alloc_lock);
}
}
#endif
diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c
index 2cc3bce..9eb10b4 100644
--- a/arch/sparc/mm/tsb.c
+++ b/arch/sparc/mm/tsb.c
@@ -73,7 +73,7 @@ void flush_tsb_user(struct tlb_batch *tb)
struct mm_struct *mm = tb->mm;
unsigned long nentries, base, flags;
- spin_lock_irqsave(&mm->context.lock, flags);
+ raw_spin_lock_irqsave(&mm->context.lock, flags);
base = (unsigned long) mm->context.tsb_block[MM_TSB_BASE].tsb;
nentries = mm->context.tsb_block[MM_TSB_BASE].tsb_nentries;
@@ -90,14 +90,14 @@ void flush_tsb_user(struct tlb_batch *tb)
__flush_tsb_one(tb, HPAGE_SHIFT, base, nentries);
}
#endif
- spin_unlock_irqrestore(&mm->context.lock, flags);
+ raw_spin_unlock_irqrestore(&mm->context.lock, flags);
}
void flush_tsb_user_page(struct mm_struct *mm, unsigned long vaddr)
{
unsigned long nentries, base, flags;
- spin_lock_irqsave(&mm->context.lock, flags);
+ raw_spin_lock_irqsave(&mm->context.lock, flags);
base = (unsigned long) mm->context.tsb_block[MM_TSB_BASE].tsb;
nentries = mm->context.tsb_block[MM_TSB_BASE].tsb_nentries;
@@ -114,7 +114,7 @@ void flush_tsb_user_page(struct mm_struct *mm, unsigned
long vaddr)
__flush_tsb_one_entry(base, vaddr, HPAGE_SHIFT, nentries);
}
#endif
- spin_unlock_irqrestore(&mm->context.lock, flags);
+ raw_spin_unlock_irqrestore(&mm->context.lock, flags);
}
#define HV_PGSZ_IDX_BASE HV_PGSZ_IDX_8K
@@ -392,7 +392,7 @@ void tsb_grow(struct mm_struct *mm, unsigned long
tsb_index, unsigned long rss)
* the lock and ask all other cpus running this address space
* to run tsb_context_switch() to see the new TSB table.
*/
- spin_lock_irqsave(&mm->context.lock, flags);
+ raw_spin_lock_irqsave(&mm->context.lock, flags);
old_tsb = mm->context.tsb_block[tsb_index].tsb;
old_cache_index =
@@ -407,7 +407,7 @@ void tsb_grow(struct mm_struct *mm, unsigned long
tsb_index, unsigned long rss)
*/
if (unlikely(old_tsb &&
(rss < mm->context.tsb_block[tsb_index].tsb_rss_limit))) {
- spin_unlock_irqrestore(&mm->context.lock, flags);
+ raw_spin_unlock_irqrestore(&mm->context.lock, flags);
kmem_cache_free(tsb_caches[new_cache_index], new_tsb);
return;
@@ -433,7 +433,7 @@ void tsb_grow(struct mm_struct *mm, unsigned long
tsb_index, unsigned long rss)
mm->context.tsb_block[tsb_index].tsb = new_tsb;
setup_tsb_params(mm, tsb_index, new_size);
- spin_unlock_irqrestore(&mm->context.lock, flags);
+ raw_spin_unlock_irqrestore(&mm->context.lock, flags);
/* If old_tsb is NULL, we're being invoked for the first time
* from init_new_context().
@@ -459,7 +459,7 @@ int init_new_context(struct task_struct *tsk, struct
mm_struct *mm)
#endif
unsigned int i;
- spin_lock_init(&mm->context.lock);
+ raw_spin_lock_init(&mm->context.lock);
mm->context.sparc64_ctx_val = 0UL;
@@ -523,12 +523,12 @@ void destroy_context(struct mm_struct *mm)
free_hot_cold_page(page, 0);
}
- spin_lock_irqsave(&ctx_alloc_lock, flags);
+ raw_spin_lock_irqsave(&ctx_alloc_lock, flags);
if (CTX_VALID(mm->context)) {
unsigned long nr = CTX_NRBITS(mm->context);
mmu_context_bmap[nr>>6] &= ~(1UL << (nr & 63));
}
- spin_unlock_irqrestore(&ctx_alloc_lock, flags);
+ raw_spin_unlock_irqrestore(&ctx_alloc_lock, flags);
}
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index 74fe7f7..a00dfaf 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -182,10 +182,9 @@ static struct irqaction tc_irqaction = {
.handler = ch2_irq,
};
-static void __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
+static void __init setup_clkevents(struct atmel_tc *tc, int divisor_idx)
{
- unsigned divisor = atmel_tc_divisors[clk32k_divisor_idx];
- u32 freq;
+ unsigned divisor = atmel_tc_divisors[divisor_idx];
struct clk *t2_clk = tc->clk[2];
int irq = tc->irq[2];
@@ -193,15 +192,15 @@ static void __init setup_clkevents(struct atmel_tc *tc,
int clk32k_divisor_idx)
clkevt.clk = t2_clk;
tc_irqaction.dev_id = &clkevt;
- timer_clock = clk32k_divisor_idx;
+ timer_clock = divisor_idx;
if (!divisor)
- freq = 32768;
+ clkevt.freq = 32768;
else
- freq = clk_get_rate(t2_clk) / divisor;
+ clkevt.freq = clk_get_rate(t2_clk) / divisor;
clkevt.clkevt.cpumask = cpumask_of(0);
- clockevents_config_and_register(&clkevt.clkevt, freq, 1, 0xffff);
+ clockevents_config_and_register(&clkevt.clkevt, clkevt.freq, 1, 0xffff);
setup_irq(irq, &tc_irqaction);
}
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 10eaf4d..625a41f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -167,11 +167,8 @@ extern char ___assert_task_state[1 - 2*!!(
TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
__TASK_TRACED)
-#define task_is_traced(task) ((task->state & __TASK_TRACED) != 0)
#define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0)
#define task_is_dead(task) ((task)->exit_state != 0)
-#define task_is_stopped_or_traced(task) \
- ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
#define task_contributes_to_load(task) \
((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
(task->flags & PF_FROZEN) == 0)
@@ -2531,6 +2528,51 @@ static inline int signal_pending_state(long state,
struct task_struct *p)
return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
}
+static inline bool __task_is_stopped_or_traced(struct task_struct *task)
+{
+ if (task->state & (__TASK_STOPPED | __TASK_TRACED))
+ return true;
+#ifdef CONFIG_PREEMPT_RT_FULL
+ if (task->saved_state & (__TASK_STOPPED | __TASK_TRACED))
+ return true;
+#endif
+ return false;
+}
+
+static inline bool task_is_stopped_or_traced(struct task_struct *task)
+{
+ bool traced_stopped;
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&task->pi_lock, flags);
+ traced_stopped = __task_is_stopped_or_traced(task);
+ raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+#else
+ traced_stopped = __task_is_stopped_or_traced(task);
+#endif
+ return traced_stopped;
+}
+
+static inline bool task_is_traced(struct task_struct *task)
+{
+ bool traced = false;
+
+ if (task->state & __TASK_TRACED)
+ return true;
+#ifdef CONFIG_PREEMPT_RT_FULL
+ /* in case the task is sleeping on tasklist_lock */
+ raw_spin_lock_irq(&task->pi_lock);
+ if (task->state & __TASK_TRACED)
+ traced = true;
+ else if (task->saved_state & __TASK_TRACED)
+ traced = true;
+ raw_spin_unlock_irq(&task->pi_lock);
+#endif
+ return traced;
+}
+
/*
* cond_resched() and cond_resched_lock(): latency reduction via
* explicit rescheduling in places that are safe. The return
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index 142c0f7..019a936 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -236,8 +236,7 @@ static inline unsigned read_seqbegin(seqlock_t *sl)
* Take the lock and let the writer proceed (i.e. evtl
* boost it), otherwise we could loop here forever.
*/
- spin_lock(&sl->lock);
- spin_unlock(&sl->lock);
+ spin_unlock_wait(&sl->lock);
goto repeat;
}
return ret;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 1f4bcb3..fddaf65 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -135,7 +135,12 @@ static bool ptrace_freeze_traced(struct task_struct *task)
spin_lock_irq(&task->sighand->siglock);
if (task_is_traced(task) && !__fatal_signal_pending(task)) {
- task->state = __TASK_TRACED;
+ raw_spin_lock_irq(&task->pi_lock);
+ if (task->state & __TASK_TRACED)
+ task->state = __TASK_TRACED;
+ else
+ task->saved_state = __TASK_TRACED;
+ raw_spin_unlock_irq(&task->pi_lock);
ret = true;
}
spin_unlock_irq(&task->sighand->siglock);
diff --git a/kernel/rt.c b/kernel/rt.c
index 4b2c4a9..29771e2 100644
--- a/kernel/rt.c
+++ b/kernel/rt.c
@@ -196,10 +196,9 @@ int __lockfunc rt_write_trylock_irqsave(rwlock_t *rwlock,
unsigned long *flags)
int ret;
*flags = 0;
- migrate_disable();
ret = rt_write_trylock(rwlock);
- if (!ret)
- migrate_enable();
+ if (ret)
+ migrate_disable();
return ret;
}
EXPORT_SYMBOL(rt_write_trylock_irqsave);
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 4e9691f..4057bc6 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -938,12 +938,11 @@ int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock,
unsigned long *flags)
int ret;
*flags = 0;
- migrate_disable();
ret = rt_mutex_trylock(&lock->lock);
- if (ret)
+ if (ret) {
+ migrate_disable();
spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
- else
- migrate_enable();
+ }
return ret;
}
EXPORT_SYMBOL(rt_spin_trylock_irqsave);
@@ -953,12 +952,12 @@ int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t
*lock)
/* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
if (atomic_add_unless(atomic, -1, 1))
return 0;
- migrate_disable();
rt_spin_lock(lock);
- if (atomic_dec_and_test(atomic))
+ if (atomic_dec_and_test(atomic)){
+ migrate_disable();
return 1;
+ }
rt_spin_unlock(lock);
- migrate_enable();
return 0;
}
EXPORT_SYMBOL(atomic_dec_and_spin_lock);
@@ -1007,6 +1006,7 @@ static inline int __sched
__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx)
{
BUG();
+ return 0;
}
#endif
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 22fa2e2..9c87a17 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1071,6 +1071,20 @@ struct migration_arg {
static int migration_cpu_stop(void *data);
+static bool check_task_state(struct task_struct *p, long match_state)
+{
+ bool match = false;
+
+ raw_spin_lock_irq(&p->pi_lock);
+ if (p->state == match_state)
+ match = true;
+ else if (p->saved_state == match_state)
+ match = true;
+ raw_spin_unlock_irq(&p->pi_lock);
+
+ return match;
+}
+
/*
* wait_task_inactive - wait for a thread to unschedule.
*
@@ -1115,9 +1129,11 @@ unsigned long wait_task_inactive(struct task_struct *p,
long match_state)
* is actually now running somewhere else!
*/
while (task_running(rq, p)) {
- if (match_state && unlikely(p->state != match_state)
- && unlikely(p->saved_state != match_state))
+ if (match_state) {
+ if (!unlikely(check_task_state(p, match_state)))
+ return 0;
return 0;
+ }
cpu_relax();
}
@@ -1613,7 +1629,7 @@ try_to_wake_up(struct task_struct *p, unsigned int state,
int wake_flags)
*/
int wake_up_process(struct task_struct *p)
{
- WARN_ON(task_is_stopped_or_traced(p));
+ WARN_ON(__task_is_stopped_or_traced(p));
return try_to_wake_up(p, TASK_NORMAL, 0);
}
EXPORT_SYMBOL(wake_up_process);
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 9a7268f..2da729b 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -569,8 +569,8 @@ static void do_current_softirqs(int need_rcu_bh_qs)
void local_bh_disable(void)
{
- migrate_disable();
- current->softirq_nestcnt++;
+ if (++current->softirq_nestcnt == 1)
+ migrate_disable();
}
EXPORT_SYMBOL(local_bh_disable);
@@ -584,8 +584,8 @@ void local_bh_enable(void)
do_current_softirqs(1);
local_irq_enable();
- current->softirq_nestcnt--;
- migrate_enable();
+ if (--current->softirq_nestcnt == 0)
+ migrate_enable();
}
EXPORT_SYMBOL(local_bh_enable);
@@ -597,8 +597,10 @@ EXPORT_SYMBOL(local_bh_enable_ip);
void _local_bh_enable(void)
{
- current->softirq_nestcnt--;
- migrate_enable();
+ if (WARN_ON(current->softirq_nestcnt == 0))
+ return;
+ if (--current->softirq_nestcnt == 0)
+ migrate_enable();
}
EXPORT_SYMBOL(_local_bh_enable);
diff --git a/localversion-rt b/localversion-rt
index 0efe7ba..8fc605d 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt5
+-rt6
--
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