summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--include/linux/lglock.h5
-rw-r--r--kernel/locking/lglock.c22
-rw-r--r--kernel/stop_machine.c42
3 files changed, 26 insertions, 43 deletions
diff --git a/include/linux/lglock.h b/include/linux/lglock.h
index c92ebd100d9b..0081f000e34b 100644
--- a/include/linux/lglock.h
+++ b/include/linux/lglock.h
@@ -52,15 +52,10 @@ struct lglock {
static struct lglock name = { .lock = &name ## _lock }
void lg_lock_init(struct lglock *lg, char *name);
-
void lg_local_lock(struct lglock *lg);
void lg_local_unlock(struct lglock *lg);
void lg_local_lock_cpu(struct lglock *lg, int cpu);
void lg_local_unlock_cpu(struct lglock *lg, int cpu);
-
-void lg_double_lock(struct lglock *lg, int cpu1, int cpu2);
-void lg_double_unlock(struct lglock *lg, int cpu1, int cpu2);
-
void lg_global_lock(struct lglock *lg);
void lg_global_unlock(struct lglock *lg);
diff --git a/kernel/locking/lglock.c b/kernel/locking/lglock.c
index 951cfcd10b4a..86ae2aebf004 100644
--- a/kernel/locking/lglock.c
+++ b/kernel/locking/lglock.c
@@ -60,28 +60,6 @@ void lg_local_unlock_cpu(struct lglock *lg, int cpu)
}
EXPORT_SYMBOL(lg_local_unlock_cpu);
-void lg_double_lock(struct lglock *lg, int cpu1, int cpu2)
-{
- BUG_ON(cpu1 == cpu2);
-
- /* lock in cpu order, just like lg_global_lock */
- if (cpu2 < cpu1)
- swap(cpu1, cpu2);
-
- preempt_disable();
- lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
- arch_spin_lock(per_cpu_ptr(lg->lock, cpu1));
- arch_spin_lock(per_cpu_ptr(lg->lock, cpu2));
-}
-
-void lg_double_unlock(struct lglock *lg, int cpu1, int cpu2)
-{
- lock_release(&lg->lock_dep_map, 1, _RET_IP_);
- arch_spin_unlock(per_cpu_ptr(lg->lock, cpu1));
- arch_spin_unlock(per_cpu_ptr(lg->lock, cpu2));
- preempt_enable();
-}
-
void lg_global_lock(struct lglock *lg)
{
int i;
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 4a1ca5f6da7e..ae6f41fb9cba 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -20,7 +20,6 @@
#include <linux/kallsyms.h>
#include <linux/smpboot.h>
#include <linux/atomic.h>
-#include <linux/lglock.h>
#include <linux/nmi.h>
/*
@@ -47,13 +46,9 @@ struct cpu_stopper {
static DEFINE_PER_CPU(struct cpu_stopper, cpu_stopper);
static bool stop_machine_initialized = false;
-/*
- * Avoids a race between stop_two_cpus and global stop_cpus, where
- * the stoppers could get queued up in reverse order, leading to
- * system deadlock. Using an lglock means stop_two_cpus remains
- * relatively cheap.
- */
-DEFINE_STATIC_LGLOCK(stop_cpus_lock);
+/* static data for stop_cpus */
+static DEFINE_MUTEX(stop_cpus_mutex);
+static bool stop_cpus_in_progress;
static void cpu_stop_init_done(struct cpu_stop_done *done, unsigned int nr_todo)
{
@@ -230,14 +225,26 @@ static int cpu_stop_queue_two_works(int cpu1, struct cpu_stop_work *work1,
struct cpu_stopper *stopper1 = per_cpu_ptr(&cpu_stopper, cpu1);
struct cpu_stopper *stopper2 = per_cpu_ptr(&cpu_stopper, cpu2);
int err;
-
- lg_double_lock(&stop_cpus_lock, cpu1, cpu2);
+retry:
spin_lock_irq(&stopper1->lock);
spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING);
err = -ENOENT;
if (!stopper1->enabled || !stopper2->enabled)
goto unlock;
+ /*
+ * Ensure that if we race with __stop_cpus() the stoppers won't get
+ * queued up in reverse order leading to system deadlock.
+ *
+ * We can't miss stop_cpus_in_progress if queue_stop_cpus_work() has
+ * queued a work on cpu1 but not on cpu2, we hold both locks.
+ *
+ * It can be falsely true but it is safe to spin until it is cleared,
+ * queue_stop_cpus_work() does everything under preempt_disable().
+ */
+ err = -EDEADLK;
+ if (unlikely(stop_cpus_in_progress))
+ goto unlock;
err = 0;
__cpu_stop_queue_work(stopper1, work1);
@@ -245,8 +252,12 @@ static int cpu_stop_queue_two_works(int cpu1, struct cpu_stop_work *work1,
unlock:
spin_unlock(&stopper2->lock);
spin_unlock_irq(&stopper1->lock);
- lg_double_unlock(&stop_cpus_lock, cpu1, cpu2);
+ if (unlikely(err == -EDEADLK)) {
+ while (stop_cpus_in_progress)
+ cpu_relax();
+ goto retry;
+ }
return err;
}
/**
@@ -316,9 +327,6 @@ bool stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
return cpu_stop_queue_work(cpu, work_buf);
}
-/* static data for stop_cpus */
-static DEFINE_MUTEX(stop_cpus_mutex);
-
static bool queue_stop_cpus_work(const struct cpumask *cpumask,
cpu_stop_fn_t fn, void *arg,
struct cpu_stop_done *done)
@@ -332,7 +340,8 @@ static bool queue_stop_cpus_work(const struct cpumask *cpumask,
* preempted by a stopper which might wait for other stoppers
* to enter @fn which can lead to deadlock.
*/
- lg_global_lock(&stop_cpus_lock);
+ preempt_disable();
+ stop_cpus_in_progress = true;
for_each_cpu(cpu, cpumask) {
work = &per_cpu(cpu_stopper.stop_work, cpu);
work->fn = fn;
@@ -341,7 +350,8 @@ static bool queue_stop_cpus_work(const struct cpumask *cpumask,
if (cpu_stop_queue_work(cpu, work))
queued = true;
}
- lg_global_unlock(&stop_cpus_lock);
+ stop_cpus_in_progress = false;
+ preempt_enable();
return queued;
}