linux-kernel - [PATCH v5 08/15] samples/bpf/user: use TASK_COMM_LEN

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Message-Id: <20211021034516.4400-9-laoar.shao@gmail.com>
Date:   Thu, 21 Oct 2021 03:45:15 +0000
From:   Yafang Shao <laoar.shao@...il.com>
To:     keescook@...omium.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, arnaldo.melo@...il.com,
        pmladek@...e.com, peterz@...radead.org, viro@...iv.linux.org.uk,
        akpm@...ux-foundation.org, valentin.schneider@....com,
        qiang.zhang@...driver.com, robdclark@...omium.org,
        christian@...uner.io, dietmar.eggemann@....com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, oliver.sang@...el.com, lkp@...el.com,
        Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH v5 08/15] samples/bpf/user: use TASK_COMM_LEN_16 instead of hard-coded 16

The task comm size is invisible to the bpf userspace, we have to
define a new TASK_COMM_LEN_16 in the userspace. Use this macro instead
of the hard-coded 16 can make it more grepable.

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: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Petr Mladek <pmladek@...e.com>
---
 samples/bpf/offwaketime_user.c | 6 +++---
 samples/bpf/tracex2_user.c     | 7 ++++---
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/samples/bpf/offwaketime_user.c b/samples/bpf/offwaketime_user.c
index 73a986876c1a..ca918ac93ee7 100644
--- a/samples/bpf/offwaketime_user.c
+++ b/samples/bpf/offwaketime_user.c
@@ -36,11 +36,11 @@ static void print_ksym(__u64 addr)
 		printf("%s;", sym->name);
 }
 
-#define TASK_COMM_LEN 16
+#define TASK_COMM_LEN_16 16
 
 struct key_t {
-	char waker[TASK_COMM_LEN];
-	char target[TASK_COMM_LEN];
+	char waker[TASK_COMM_LEN_16];
+	char target[TASK_COMM_LEN_16];
 	__u32 wret;
 	__u32 tret;
 };
diff --git a/samples/bpf/tracex2_user.c b/samples/bpf/tracex2_user.c
index 1626d51dfffd..70081d917c6d 100644
--- a/samples/bpf/tracex2_user.c
+++ b/samples/bpf/tracex2_user.c
@@ -10,8 +10,9 @@
 #include <bpf/libbpf.h>
 #include "bpf_util.h"
 
-#define MAX_INDEX	64
-#define MAX_STARS	38
+#define MAX_INDEX		64
+#define MAX_STARS		38
+#define TASK_COMM_LEN_16	16
 
 /* my_map, my_hist_map */
 static int map_fd[2];
@@ -28,7 +29,7 @@ static void stars(char *str, long val, long max, int width)
 }
 
 struct task {
-	char comm[16];
+	char comm[TASK_COMM_LEN_16];
 	__u64 pid_tgid;
 	__u64 uid_gid;
 };
-- 
2.17.1