Merge remote-tracking branch 'remotes/stable/linux-4.4.y' into karo-tx6-mainline

[karo-tx-linux.git] / lib / dump_stack.c

diff --git a/lib/dump_stack.c b/lib/dump_stack.c
index 6745c6230db3403629048256968443f51b777655..c30d07e99dba4cc32be6aeb4d353d79058509b4b 100644 (file)
--- a/lib/dump_stack.c
+++ b/lib/dump_stack.c
@@ -25,6 +25,7 @@ static atomic_t dump_lock = ATOMIC_INIT(-1);
 
 asmlinkage __visible void dump_stack(void)
 {
+       unsigned long flags;
        int was_locked;
        int old;
        int cpu;
@@ -33,9 +34,8 @@ asmlinkage __visible void dump_stack(void)
         * Permit this cpu to perform nested stack dumps while serialising
         * against other CPUs
         */
-       preempt_disable();
-
 retry:
+       local_irq_save(flags);
        cpu = smp_processor_id();
        old = atomic_cmpxchg(&dump_lock, -1, cpu);
        if (old == -1) {
@@ -43,6 +43,7 @@ retry:
        } else if (old == cpu) {
                was_locked = 1;
        } else {
+               local_irq_restore(flags);
                cpu_relax();
                goto retry;
        }
@@ -52,7 +53,7 @@ retry:
        if (!was_locked)
                atomic_set(&dump_lock, -1);
 
-       preempt_enable();
+       local_irq_restore(flags);
 }
 #else
 asmlinkage __visible void dump_stack(void)