From d321d505edb64286bae0e464574d0fd553e31adc Mon Sep 17 00:00:00 2001 From: "Christophe Leroy (CS GROUP)" Date: Fri, 16 Jan 2026 10:48:55 +0100 Subject: [PATCH] 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) Reviewed-by: Maxime Chevallier Link: https://patch.msgid.link/8b69b40826553c1dd500d9d25e45883744f3f348.1768556791.git.chleroy@kernel.org Signed-off-by: Jakub Kicinski --- tools/testing/selftests/net/lib/csum.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/lib/csum.c b/tools/testing/selftests/net/lib/csum.c index 27437590eeb53..e28884ce3ab39 100644 --- 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); -- 2.47.3