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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /kernel/trace/blktrace.c
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'kernel/trace/blktrace.c')
-rw-r--r--kernel/trace/blktrace.c27
1 files changed, 11 insertions, 16 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 90e72a0c3..a990824c8 100644
--- 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();