selftests: net: csum: Fix printk format in recv_get_packet_csum_status()

Following warning is encountered when building selftests on powerpc/32.

  CC       csum
csum.c: In function 'recv_get_packet_csum_status':
csum.c:710:50: warning: format '%lu' expects argument of type 'long unsigned int', but argument 4 has type 'size_t' {aka 'unsigned int'} [-Wformat=]
  710 |                         error(1, 0, "cmsg: len=%lu expected=%lu",
      |                                                ~~^
      |                                                  |
      |                                                  long unsigned int
      |                                                %u
  711 |                               cm->cmsg_len, CMSG_LEN(sizeof(struct tpacket_auxdata)));
      |                               ~~~~~~~~~~~~
      |                                 |
      |                                 size_t {aka unsigned int}
csum.c:710:63: warning: format '%lu' expects argument of type 'long unsigned int', but argument 5 has type 'unsigned int' [-Wformat=]
  710 |                         error(1, 0, "cmsg: len=%lu expected=%lu",
      |                                                             ~~^
      |                                                               |
      |                                                               long unsigned int
      |                                                             %u

cm->cmsg_len has type __kernel_size_t and CMSG() macro has the type
returned by sizeof() which is size_t.

size_t is 'unsigned int' on some platforms and 'unsigned long' on
other ones so use %zu instead of %lu.

The code in question was introduced by
commit 91a7de85600d ("selftests/net: add csum offload test").

Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>
Reviewed-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/8b69b40826553c1dd500d9d25e45883744f3f348.1768556791.git.chleroy@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/lib/csum.c b/tools/testing/selftests/net/lib/csum.c
index 27437590eeb5398d02da353841ec424f0e91a760..e28884ce3ab397b30517be5f7874ea79bec9fa54 100644 (file)
--- a/tools/testing/selftests/net/lib/csum.c
+++ b/tools/testing/selftests/net/lib/csum.c
@@ -707,7 +707,7 @@ static uint32_t recv_get_packet_csum_status(struct msghdr *msg)
                              cm->cmsg_level, cm->cmsg_type);
 
                if (cm->cmsg_len != CMSG_LEN(sizeof(struct tpacket_auxdata)))
-                       error(1, 0, "cmsg: len=%lu expected=%lu",
+                       error(1, 0, "cmsg: len=%zu expected=%zu",
                              cm->cmsg_len, CMSG_LEN(sizeof(struct tpacket_auxdata)));
 
                aux = (void *)CMSG_DATA(cm);