tracing: protect trace_printk from recursion

trace_printk can be called from any context, including NMIs.
If this happens, then we must test for for recursion before
grabbing any spinlocks.

This patch prevents trace_printk from being called recursively.

[ Impact: prevent hard lockup in lockdep event tracer ]

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 183d788..b9a3adc 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1259,6 +1259,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
        struct trace_array_cpu *data;
        struct bprint_entry *entry;
        unsigned long flags;
+       int disable;
        int resched;
        int cpu, len = 0, size, pc;
 
@@ -1273,7 +1274,8 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
        cpu = raw_smp_processor_id();
        data = tr->data[cpu];
 
-       if (unlikely(atomic_read(&data->disabled)))
+       disable = atomic_inc_return(&data->disabled);
+       if (unlikely(disable != 1))
                goto out;
 
        /* Lockdep uses trace_printk for lock tracing */
@@ -1301,6 +1303,7 @@ out_unlock:
        local_irq_restore(flags);
 
 out:
+       atomic_dec_return(&data->disabled);
        ftrace_preempt_enable(resched);
        unpause_graph_tracing();
 
@@ -1320,6 +1323,7 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
        int cpu, len = 0, size, pc;
        struct print_entry *entry;
        unsigned long irq_flags;
+       int disable;
 
        if (tracing_disabled || tracing_selftest_running)
                return 0;
@@ -1329,7 +1333,8 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
        cpu = raw_smp_processor_id();
        data = tr->data[cpu];
 
-       if (unlikely(atomic_read(&data->disabled)))
+       disable = atomic_inc_return(&data->disabled);
+       if (unlikely(disable != 1))
                goto out;
 
        pause_graph_tracing();
@@ -1357,6 +1362,7 @@ int trace_vprintk(unsigned long ip, const char *fmt, va_list args)
        raw_local_irq_restore(irq_flags);
        unpause_graph_tracing();
  out:
+       atomic_dec_return(&data->disabled);
        preempt_enable_notrace();
 
        return len;