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

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Date:   Tue,  7 Feb 2017 12:12:49 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ingo Molnar <mingo@...hat.com>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Subject: [PATCH tip/master] tracing/probes: Fix a warning message to show correct maximum length

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@...nel.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;
 		}