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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull scheduler fix from Thomas Gleixner:
 "A single bug fix to prevent a subtle deadlock in the scheduler core
  code vs cpu hotplug"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/core: Fix cpu.max vs. cpuhotplug deadlock
This commit is contained in:
Linus Torvalds
2018-01-28 11:51:45 -08:00
parent 39e383626c ce48c14649
commit 624441927f
3 changed files with 18 additions and 5 deletions
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12
kernel/jump_label.c
View File

@@ -79,7 +79,7 @@ int static_key_count(struct static_key *key)
}
EXPORT_SYMBOL_GPL(static_key_count);
static void static_key_slow_inc_cpuslocked(struct static_key *key)
void static_key_slow_inc_cpuslocked(struct static_key *key)
{
int v, v1;
@@ -180,7 +180,7 @@ void static_key_disable(struct static_key *key)
}
EXPORT_SYMBOL_GPL(static_key_disable);
static void static_key_slow_dec_cpuslocked(struct static_key *key,
static void __static_key_slow_dec_cpuslocked(struct static_key *key,
unsigned long rate_limit,
struct delayed_work *work)
{
@@ -211,7 +211,7 @@ static void __static_key_slow_dec(struct static_key *key,
struct delayed_work *work)
{
cpus_read_lock();
static_key_slow_dec_cpuslocked(key, rate_limit, work);
__static_key_slow_dec_cpuslocked(key, rate_limit, work);
cpus_read_unlock();
}
@@ -229,6 +229,12 @@ void static_key_slow_dec(struct static_key *key)
}
EXPORT_SYMBOL_GPL(static_key_slow_dec);
void static_key_slow_dec_cpuslocked(struct static_key *key)
{
STATIC_KEY_CHECK_USE(key);
__static_key_slow_dec_cpuslocked(key, 0, NULL);
}
void static_key_slow_dec_deferred(struct static_key_deferred *key)
{
STATIC_KEY_CHECK_USE(key);

4
kernel/sched/fair.c
View File

@@ -4365,12 +4365,12 @@ static inline bool cfs_bandwidth_used(void)
void cfs_bandwidth_usage_inc(void)
{
static_key_slow_inc(&__cfs_bandwidth_used);
static_key_slow_inc_cpuslocked(&__cfs_bandwidth_used);
}
void cfs_bandwidth_usage_dec(void)
{
static_key_slow_dec(&__cfs_bandwidth_used);
static_key_slow_dec_cpuslocked(&__cfs_bandwidth_used);
}
#else /* HAVE_JUMP_LABEL */
static bool cfs_bandwidth_used(void)