Merge remote-tracking branch 'lsk/v3.10/topic/gator' into linux-linaro-lsk

[firefly-linux-kernel-4.4.55.git] / kernel / trace / trace.c

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 6dbdf277c8fedf308030cafc9e2ec66e14a31d0e..18cdf91b2f853d34ab09c1ae90f1d7c0ba2e300a 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -423,6 +423,9 @@ int __trace_puts(unsigned long ip, const char *str, int size)
        struct print_entry *entry;
        unsigned long irq_flags;
        int alloc;
+       int pc;
+
+       pc = preempt_count();
 
        if (unlikely(tracing_selftest_running || tracing_disabled))
                return 0;
@@ -432,7 +435,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
        local_save_flags(irq_flags);
        buffer = global_trace.trace_buffer.buffer;
        event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, 
-                                         irq_flags, preempt_count());
+                                         irq_flags, pc);
        if (!event)
                return 0;
 
@@ -449,6 +452,7 @@ int __trace_puts(unsigned long ip, const char *str, int size)
                entry->buf[size] = '\0';
 
        __buffer_unlock_commit(buffer, event);
+       ftrace_trace_stack(buffer, irq_flags, 4, pc);
 
        return size;
 }
@@ -466,6 +470,9 @@ int __trace_bputs(unsigned long ip, const char *str)
        struct bputs_entry *entry;
        unsigned long irq_flags;
        int size = sizeof(struct bputs_entry);
+       int pc;
+
+       pc = preempt_count();
 
        if (unlikely(tracing_selftest_running || tracing_disabled))
                return 0;
@@ -473,7 +480,7 @@ int __trace_bputs(unsigned long ip, const char *str)
        local_save_flags(irq_flags);
        buffer = global_trace.trace_buffer.buffer;
        event = trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size,
-                                         irq_flags, preempt_count());
+                                         irq_flags, pc);
        if (!event)
                return 0;
 
@@ -482,6 +489,7 @@ int __trace_bputs(unsigned long ip, const char *str)
        entry->str                      = str;
 
        __buffer_unlock_commit(buffer, event);
+       ftrace_trace_stack(buffer, irq_flags, 4, pc);
 
        return 1;
 }
@@ -733,7 +741,7 @@ static struct {
        { trace_clock_local,    "local",        1 },
        { trace_clock_global,   "global",       1 },
        { trace_clock_counter,  "counter",      0 },
-       { trace_clock_jiffies,  "uptime",       1 },
+       { trace_clock_jiffies,  "uptime",       0 },
        { trace_clock,          "perf",         1 },
        ARCH_TRACE_CLOCKS
 };
@@ -1027,13 +1035,13 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
 }
 #endif /* CONFIG_TRACER_MAX_TRACE */
 
-static void default_wait_pipe(struct trace_iterator *iter)
+static int default_wait_pipe(struct trace_iterator *iter)
 {
        /* Iterators are static, they should be filled or empty */
        if (trace_buffer_iter(iter, iter->cpu_file))
-               return;
+               return 0;
 
-       ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file);
+       return ring_buffer_wait(iter->trace_buffer->buffer, iter->cpu_file);
 }
 
 #ifdef CONFIG_FTRACE_STARTUP_TEST
@@ -1306,7 +1314,6 @@ void tracing_start(void)
 
        arch_spin_unlock(&ftrace_max_lock);
 
-       ftrace_start();
  out:
        raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
 }
@@ -1353,7 +1360,6 @@ void tracing_stop(void)
        struct ring_buffer *buffer;
        unsigned long flags;
 
-       ftrace_stop();
        raw_spin_lock_irqsave(&global_trace.start_lock, flags);
        if (global_trace.stop_count++)
                goto out;
@@ -1400,12 +1406,12 @@ static void tracing_stop_tr(struct trace_array *tr)
 
 void trace_stop_cmdline_recording(void);
 
-static void trace_save_cmdline(struct task_struct *tsk)
+static int trace_save_cmdline(struct task_struct *tsk)
 {
        unsigned pid, idx;
 
        if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT))
-               return;
+               return 0;
 
        /*
         * It's not the end of the world if we don't get
@@ -1414,7 +1420,7 @@ static void trace_save_cmdline(struct task_struct *tsk)
         * so if we miss here, then better luck next time.
         */
        if (!arch_spin_trylock(&trace_cmdline_lock))
-               return;
+               return 0;
 
        idx = map_pid_to_cmdline[tsk->pid];
        if (idx == NO_CMDLINE_MAP) {
@@ -1439,6 +1445,8 @@ static void trace_save_cmdline(struct task_struct *tsk)
        memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN);
 
        arch_spin_unlock(&trace_cmdline_lock);
+
+       return 1;
 }
 
 void trace_find_cmdline(int pid, char comm[])
@@ -1480,9 +1488,8 @@ void tracing_record_cmdline(struct task_struct *tsk)
        if (!__this_cpu_read(trace_cmdline_save))
                return;
 
-       __this_cpu_write(trace_cmdline_save, false);
-
-       trace_save_cmdline(tsk);
+       if (trace_save_cmdline(tsk))
+               __this_cpu_write(trace_cmdline_save, false);
 }
 
 void
@@ -4055,17 +4062,19 @@ tracing_poll_pipe(struct file *filp, poll_table *poll_table)
  *
  *     Anyway, this is really very primitive wakeup.
  */
-void poll_wait_pipe(struct trace_iterator *iter)
+int poll_wait_pipe(struct trace_iterator *iter)
 {
        set_current_state(TASK_INTERRUPTIBLE);
        /* sleep for 100 msecs, and try again. */
        schedule_timeout(HZ / 10);
+       return 0;
 }
 
 /* Must be called with trace_types_lock mutex held. */
 static int tracing_wait_pipe(struct file *filp)
 {
        struct trace_iterator *iter = filp->private_data;
+       int ret;
 
        while (trace_empty(iter)) {
 
@@ -4075,10 +4084,13 @@ static int tracing_wait_pipe(struct file *filp)
 
                mutex_unlock(&iter->mutex);
 
-               iter->trace->wait_pipe(iter);
+               ret = iter->trace->wait_pipe(iter);
 
                mutex_lock(&iter->mutex);
 
+               if (ret)
+                       return ret;
+
                if (signal_pending(current))
                        return -EINTR;
 
@@ -5012,8 +5024,12 @@ tracing_buffers_read(struct file *filp, char __user *ubuf,
                                goto out_unlock;
                        }
                        mutex_unlock(&trace_types_lock);
-                       iter->trace->wait_pipe(iter);
+                       ret = iter->trace->wait_pipe(iter);
                        mutex_lock(&trace_types_lock);
+                       if (ret) {
+                               size = ret;
+                               goto out_unlock;
+                       }
                        if (signal_pending(current)) {
                                size = -EINTR;
                                goto out_unlock;
@@ -5225,8 +5241,10 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                        goto out;
                }
                mutex_unlock(&trace_types_lock);
-               iter->trace->wait_pipe(iter);
+               ret = iter->trace->wait_pipe(iter);
                mutex_lock(&trace_types_lock);
+               if (ret)
+                       goto out;
                if (signal_pending(current)) {
                        ret = -EINTR;
                        goto out;