diff options
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index f147f198b9a6..0c22fe2d43a7 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2835,7 +2835,7 @@ tracing_entries_write(struct file *filp, const char __user *ubuf, { unsigned long val; char buf[64]; - int ret; + int ret, cpu; if (cnt >= sizeof(buf)) return -EINVAL; @@ -2857,6 +2857,14 @@ tracing_entries_write(struct file *filp, const char __user *ubuf, tracing_stop(); + /* disable all cpu buffers */ + for_each_tracing_cpu(cpu) { + if (global_trace.data[cpu]) + atomic_inc(&global_trace.data[cpu]->disabled); + if (max_tr.data[cpu]) + atomic_inc(&max_tr.data[cpu]->disabled); + } + if (val != global_trace.entries) { ret = ring_buffer_resize(global_trace.buffer, val); if (ret < 0) { @@ -2888,6 +2896,13 @@ tracing_entries_write(struct file *filp, const char __user *ubuf, if (tracing_disabled) cnt = -ENOMEM; out: + for_each_tracing_cpu(cpu) { + if (global_trace.data[cpu]) + atomic_dec(&global_trace.data[cpu]->disabled); + if (max_tr.data[cpu]) + atomic_dec(&max_tr.data[cpu]->disabled); + } + tracing_start(); max_tr.entries = global_trace.entries; mutex_unlock(&trace_types_lock); |