Merge tag 'armsoc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

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

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 90e72a0c3047990ebd9296e2c016ebb81089cfcd..a990824c86044779c089156daea170412cc84e8e 100644 (file)
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -103,7 +103,7 @@ record_it:
                memcpy((void *) t + sizeof(*t), data, len);
 
                if (blk_tracer)
-                       trace_buffer_unlock_commit(buffer, event, 0, pc);
+                       trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc);
        }
 }
 
@@ -278,7 +278,7 @@ record_it:
                        memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
 
                if (blk_tracer) {
-                       trace_buffer_unlock_commit(buffer, event, 0, pc);
+                       trace_buffer_unlock_commit(blk_tr, buffer, event, 0, pc);
                        return;
                }
        }
@@ -437,7 +437,7 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
                       struct block_device *bdev,
                       struct blk_user_trace_setup *buts)
 {
-       struct blk_trace *old_bt, *bt = NULL;
+       struct blk_trace *bt = NULL;
        struct dentry *dir = NULL;
        int ret;
 
@@ -519,11 +519,8 @@ int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
        bt->trace_state = Blktrace_setup;
 
        ret = -EBUSY;
-       old_bt = xchg(&q->blk_trace, bt);
-       if (old_bt) {
-               (void) xchg(&q->blk_trace, old_bt);
+       if (cmpxchg(&q->blk_trace, NULL, bt))
                goto err;
-       }
 
        if (atomic_inc_return(&blk_probes_ref) == 1)
                blk_register_tracepoints();
@@ -1343,6 +1340,7 @@ static const struct {
 static enum print_line_t print_one_line(struct trace_iterator *iter,
                                        bool classic)
 {
+       struct trace_array *tr = iter->tr;
        struct trace_seq *s = &iter->seq;
        const struct blk_io_trace *t;
        u16 what;
@@ -1351,7 +1349,7 @@ static enum print_line_t print_one_line(struct trace_iterator *iter,
 
        t          = te_blk_io_trace(iter->ent);
        what       = t->action & ((1 << BLK_TC_SHIFT) - 1);
-       long_act   = !!(trace_flags & TRACE_ITER_VERBOSE);
+       long_act   = !!(tr->trace_flags & TRACE_ITER_VERBOSE);
        log_action = classic ? &blk_log_action_classic : &blk_log_action;
 
        if (t->action == BLK_TN_MESSAGE) {
@@ -1413,9 +1411,9 @@ blk_tracer_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
        /* don't output context-info for blk_classic output */
        if (bit == TRACE_BLK_OPT_CLASSIC) {
                if (set)
-                       trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
+                       tr->trace_flags &= ~TRACE_ITER_CONTEXT_INFO;
                else
-                       trace_flags |= TRACE_ITER_CONTEXT_INFO;
+                       tr->trace_flags |= TRACE_ITER_CONTEXT_INFO;
        }
        return 0;
 }
@@ -1481,7 +1479,7 @@ static int blk_trace_remove_queue(struct request_queue *q)
 static int blk_trace_setup_queue(struct request_queue *q,
                                 struct block_device *bdev)
 {
-       struct blk_trace *old_bt, *bt = NULL;
+       struct blk_trace *bt = NULL;
        int ret = -ENOMEM;
 
        bt = kzalloc(sizeof(*bt), GFP_KERNEL);
@@ -1497,12 +1495,9 @@ static int blk_trace_setup_queue(struct request_queue *q,
 
        blk_trace_setup_lba(bt, bdev);
 
-       old_bt = xchg(&q->blk_trace, bt);
-       if (old_bt != NULL) {
-               (void)xchg(&q->blk_trace, old_bt);
-               ret = -EBUSY;
+       ret = -EBUSY;
+       if (cmpxchg(&q->blk_trace, NULL, bt))
                goto free_bt;
-       }
 
        if (atomic_inc_return(&blk_probes_ref) == 1)
                blk_register_tracepoints();