diff options
| author | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-12-12 19:04:22 -0500 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-12-18 23:14:16 -0500 |
| commit | 9482341d9bdaf194552673b6c1c81a824e985e7f (patch) | |
| tree | 1b567caf21944953eb41927326f77754bdc986e9 /kernel/trace | |
| parent | 40fc60e36c60ba85b2974e507b67df40c94e9578 (diff) | |
| download | linux-9482341d9bdaf194552673b6c1c81a824e985e7f.tar.gz | |
tracing: Have trace_marker break up by lines by size of trace_seq
If a trace_marker write is bigger than what trace_seq can hold, then it
will print "LINE TOO BIG" message and not what was written.
Instead, check if the write is bigger than the trace_seq and break it
up by that size.
Ideally, we could make the trace_seq dynamic that could hold this. But
that's for another time.
Link: https://lore.kernel.org/linux-trace-kernel/20231212190422.1eaf224f@gandalf.local.home
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/trace.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 0be30cccabb4b..9cf58383d2fb3 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -7304,6 +7304,11 @@ tracing_mark_write(struct file *filp, const char __user *ubuf, if (cnt < FAULTED_SIZE) size += FAULTED_SIZE - cnt; + if (size > TRACE_SEQ_BUFFER_SIZE) { + cnt -= size - TRACE_SEQ_BUFFER_SIZE; + goto again; + } + buffer = tr->array_buffer.buffer; event = __trace_buffer_lock_reserve(buffer, TRACE_PRINT, size, tracing_gen_ctx()); |