Messages in this thread | | | Date | Tue, 7 Feb 2017 08:41:48 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH tip/master] tracing/probes: Fix a warning message to show correct maximum length |
| |
* Masami Hiramatsu <mhiramat@kernel.org> wrote:
> Since tracing/*probe_events will accept a probe definition > up to 4096 - 2 ('\n' and '\0') bytes, it must show 4094 instead > of 4096 in warning message. > > Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> > --- > kernel/trace/trace_probe.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c > index 8c0553d..7138fea 100644 > --- a/kernel/trace/trace_probe.c > +++ b/kernel/trace/trace_probe.c > @@ -673,8 +673,9 @@ ssize_t traceprobe_probes_write(struct file *file, const char __user *buffer, > *tmp = '\0'; > size = tmp - kbuf + 1; > } else if (done + size < count) { > + /* This can accept WRITE_BUFSIZE - 2 ('\n' + '\0') */ > pr_warn("Line length is too long: Should be less than %d\n", > - WRITE_BUFSIZE); > + WRITE_BUFSIZE - 2);
The message should also indicate which kernel subsystem generated it - which is useful if the message is not immediately noticed in the kernel log.
You can do this by having something like this at the top of the trace_probe file:
#define pr_fmt(fmt) "trace_probe: " fmt
Thanks,
Ingo
| |