linux-kernel - [PATCH -mm 2/5] cn_proc: replaced old hard-coded 16 with TASK_COMM_LEN

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Date:   Sat,  4 Dec 2021 09:52:53 +0000
From:   Yafang Shao <laoar.shao@...il.com>
To:     akpm@...ux-foundation.org, rostedt@...dmis.org,
        keescook@...omium.org, pmladek@...e.com, david@...hat.com,
        arnaldo.melo@...il.com, andrii.nakryiko@...il.com
Cc:     linux-mm@...ck.org, bpf@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, Yafang Shao <laoar.shao@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Michal Miroslaw <mirq-linux@...e.qmqm.pl>,
        Peter Zijlstra <peterz@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH -mm 2/5] cn_proc: replaced old hard-coded 16 with TASK_COMM_LEN_16

This TASK_COMM_LEN_16 has the same meaning with the macro defined in
linux/sched.h, but we can't include linux/sched.h in a UAPI header, so
we should specifically define it in the cn_proc.h.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Michal Miroslaw <mirq-linux@...e.qmqm.pl>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: David Hildenbrand <david@...hat.com>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Kees Cook <keescook@...omium.org>
Cc: Petr Mladek <pmladek@...e.com>
---
 include/uapi/linux/cn_proc.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/cn_proc.h b/include/uapi/linux/cn_proc.h
index db210625cee8..6dcccaed383f 100644
--- a/include/uapi/linux/cn_proc.h
+++ b/include/uapi/linux/cn_proc.h
@@ -21,6 +21,8 @@
 
 #include <linux/types.h>
 
+#define TASK_COMM_LEN_16 16
+
 /*
  * Userspace sends this enum to register with the kernel that it is listening
  * for events on the connector.
@@ -110,7 +112,7 @@ struct proc_event {
 		struct comm_proc_event {
 			__kernel_pid_t process_pid;
 			__kernel_pid_t process_tgid;
-			char           comm[16];
+			char           comm[TASK_COMM_LEN_16];
 		} comm;
 
 		struct coredump_proc_event {
-- 
2.17.1