From: Arnd Bergmann <arnd@arndb.de>

When CONFIG_NET is disabled, an extra warning shows up for this
unused variable:

lib/checksum_kunit.c:218:18: error: 'expected_csum_ipv6_magic' defined but not used [-Werror=unused-const-variable=]

Replace the #ifdef with an IS_ENABLED() check that makes the compiler's
dead-code-elimination take care of the link failure.

Fixes: f24a70106dc1 ("lib: checksum: Fix build with CONFIG_NET=n")
Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 lib/checksum_kunit.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/checksum_kunit.c b/lib/checksum_kunit.c
index bf70850035c7..404dba36bae3 100644
--- a/lib/checksum_kunit.c
+++ b/lib/checksum_kunit.c
@@ -594,13 +594,15 @@ static void test_ip_fast_csum(struct kunit *test)
 
 static void test_csum_ipv6_magic(struct kunit *test)
 {
-#if defined(CONFIG_NET)
 	const struct in6_addr *saddr;
 	const struct in6_addr *daddr;
 	unsigned int len;
 	unsigned char proto;
 	__wsum csum;
 
+	if (!IS_ENABLED(CONFIG_NET))
+		return;
+
 	const int daddr_offset = sizeof(struct in6_addr);
 	const int len_offset = sizeof(struct in6_addr) + sizeof(struct in6_addr);
 	const int proto_offset = sizeof(struct in6_addr) + sizeof(struct in6_addr) +
@@ -618,7 +620,6 @@ static void test_csum_ipv6_magic(struct kunit *test)
 		CHECK_EQ(to_sum16(expected_csum_ipv6_magic[i]),
 			 csum_ipv6_magic(saddr, daddr, len, proto, csum));
 	}
-#endif /* !CONFIG_NET */
 }
 
 static struct kunit_case __refdata checksum_test_cases[] = {
-- 
2.39.2

On Thu,  4 Apr 2024 13:44:33 +0200 Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> When CONFIG_NET is disabled, an extra warning shows up for this
> unused variable:

Happy for others to take this, but to avoid misunderstandings -
if it's not on netdev@ we won't be able to apply.

Acked-by: Jakub Kicinski <kuba@kernel.org>

On Thu, 04 Apr 2024 08:01:32 PDT (-0700), kuba@kernel.org wrote:
> On Thu,  4 Apr 2024 13:44:33 +0200 Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@arndb.de>
>>
>> When CONFIG_NET is disabled, an extra warning shows up for this
>> unused variable:
>
> Happy for others to take this, but to avoid misunderstandings -
> if it's not on netdev@ we won't be able to apply.
>
> Acked-by: Jakub Kicinski <kuba@kernel.org>

Acked-by: Palmer Dabbelt <palmer@rivosinc.com>

Looks like you took the last one, do we need to just CC 
netdev@vger.kernel.org ?

On Thu, 04 Apr 2024 09:23:57 -0700 (PDT) Palmer Dabbelt wrote:
> > Acked-by: Jakub Kicinski <kuba@kernel.org>  
> 
> Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
> 
> Looks like you took the last one, do we need to just CC 
> netdev@vger.kernel.org ?

Yes, Arnd would need to resend to get it into our patchwork.