netdev - [PATCH v2 bpf 07/11] samples/bpf: fix uin64

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Date:   Thu, 21 Apr 2022 00:39:32 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     Alexander Lobakin <alobakin@...me>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Song Liu <songliubraving@...com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 bpf 07/11] samples/bpf: fix uin64_t format literals

There's a couple places where uin64_t is being passed as an %lu
format argument. That type is defined as unsigned long on 64-bit
systems and as unsigned long long on 32-bit, so neither %lu nor
%llu are not universal.
One of the options is %PRIu64, but since it's always 8-byte long,
just cast it to the _proper_ __u64 and print as %llu.

Fixes: 51570a5ab2b7 ("A Sample of using socket cookie and uid for traffic monitoring")
Fixes: 00f660eaf378 ("Sample program using SO_COOKIE")
Signed-off-by: Alexander Lobakin <alobakin@...me>
---
 samples/bpf/cookie_uid_helper_example.c | 12 ++++++------
 samples/bpf/lwt_len_hist_user.c         |  7 ++++---
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/samples/bpf/cookie_uid_helper_example.c b/samples/bpf/cookie_uid_helper_example.c
index f0df3dda4b1f..269fac58fd5c 100644
--- a/samples/bpf/cookie_uid_helper_example.c
+++ b/samples/bpf/cookie_uid_helper_example.c
@@ -207,9 +207,9 @@ static void print_table(void)
 			error(1, errno, "fail to get entry value of Key: %u\n",
 				curN);
 		} else {
-			printf("cookie: %u, uid: 0x%x, Packet Count: %lu,"
-				" Bytes Count: %lu\n", curN, curEntry.uid,
-				curEntry.packets, curEntry.bytes);
+			printf("cookie: %u, uid: 0x%x, Packet Count: %llu, Bytes Count: %llu\n",
+			       curN, curEntry.uid, (__u64)curEntry.packets,
+			       (__u64)curEntry.bytes);
 		}
 	}
 }
@@ -265,9 +265,9 @@ static void udp_client(void)
 		if (res < 0)
 			error(1, errno, "lookup sk stat failed, cookie: %lu\n",
 			      cookie);
-		printf("cookie: %lu, uid: 0x%x, Packet Count: %lu,"
-			" Bytes Count: %lu\n\n", cookie, dataEntry.uid,
-			dataEntry.packets, dataEntry.bytes);
+		printf("cookie: %llu, uid: 0x%x, Packet Count: %llu, Bytes Count: %llu\n\n",
+		       (__u64)cookie, dataEntry.uid, (__u64)dataEntry.packets,
+		       (__u64)dataEntry.bytes);
 	}
 	close(s_send);
 	close(s_rcv);
diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
index 430a4b7e353e..c682faa75a2b 100644
--- a/samples/bpf/lwt_len_hist_user.c
+++ b/samples/bpf/lwt_len_hist_user.c
@@ -44,7 +44,8 @@ int main(int argc, char **argv)

 	while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
 		if (next_key >= MAX_INDEX) {
-			fprintf(stderr, "Key %lu out of bounds\n", next_key);
+			fprintf(stderr, "Key %llu out of bounds\n",
+				(__u64)next_key);
 			continue;
 		}

@@ -66,8 +67,8 @@ int main(int argc, char **argv)

 	for (i = 1; i <= max_key + 1; i++) {
 		stars(starstr, data[i - 1], max_value, MAX_STARS);
-		printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
-		       (1l << i) >> 1, (1l << i) - 1, data[i - 1],
+		printf("%8ld -> %-8ld : %-8lld |%-*s|\n",
+		       (1l << i) >> 1, (1l << i) - 1, (__u64)data[i - 1],
 		       MAX_STARS, starstr);
 	}

--
2.36.0