linux-kernel - [PATCH] ftrace: fix task's invalid comm of <...> when big pid

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Message-Id: <1522240347-24465-1-git-send-email-yuwang@linux.alibaba.com>
Date:   Wed, 28 Mar 2018 20:32:27 +0800
From:   Wang Yu <yuwang@...ux.alibaba.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Wang Yu <yuwang@...ux.alibaba.com>
Subject: [PATCH] ftrace: fix task's invalid comm of <...> when big pid

when pid is bigger than PID_MAX_DEFAULT, the comm of task
is <...>, it is better use pid_max to compare

Signed-off-by: Wang Yu <yuwang@...ux.alibaba.com>
---
 kernel/trace/trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 mode change 100644 => 100755 kernel/trace/trace.c

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
old mode 100644
new mode 100755
index 20a2300..0d4bc7a
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1976,7 +1976,7 @@ static void __trace_find_cmdline(int pid, char comm[])
 		return;
 	}
 
-	if (pid > PID_MAX_DEFAULT) {
+	if (pid > pid_max) {
 		strcpy(comm, "<...>");
 		return;
 	}
-- 
1.8.3.1