[PATCH tip/master] tracing/probes: Fix a warning message to show correct maximum length

[Masami Hiramatsu]

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 <mhira...@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);
                        ret = -EINVAL;
                        goto out;
                }