[PATCH net] netfilter: nf_tables: Only use nf_skip_indirect_calls() when MITIGATION_RETPOLINE

[WangYuli]

1. MITIGATION_RETPOLINE is x86-only (defined in arch/x86/Kconfig),
so no need to AND with CONFIG_X86 when checking if enabled.

2. Remove unused declaration of nf_skip_indirect_calls() when
MITIGATION_RETPOLINE is disabled to avoid warnings.

3. Declare nf_skip_indirect_calls() and nf_skip_indirect_calls_enable()
as inline when MITIGATION_RETPOLINE is enabled, as they are called
only once and have simple logic.

4. Following that, there's no need to define an empty
nf_skip_indirect_calls_enable function. Just simply add the same macro
condition around its sole call site.

Fix follow error with clang-21 when W=1e:
  net/netfilter/nf_tables_core.c:39:20: error: unused function 'nf_skip_indirect_calls' [-Werror,-Wunused-function]
     39 | static inline bool nf_skip_indirect_calls(void) { return false; }
        |                    ^~~~~~~~~~~~~~~~~~~~~~
  1 error generated.
  make[4]: *** [scripts/Makefile.build:207: net/netfilter/nf_tables_core.o] Error 1
  make[3]: *** [scripts/Makefile.build:465: net/netfilter] Error 2
  make[3]: *** Waiting for unfinished jobs....

Fixes: d8d760627855 ("netfilter: nf_tables: add static key to skip retpoline workarounds")
Co-developed-by: Wentao Guan <guanwentao@xxxxxxxxxxxxx>
Signed-off-by: Wentao Guan <guanwentao@xxxxxxxxxxxxx>
Signed-off-by: WangYuli <wangyuli@xxxxxxxxxxxxx>
---
 net/netfilter/nf_tables_core.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index 75598520b0fa..48b8d2406d4e 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -21,25 +21,20 @@
 #include <net/netfilter/nf_log.h>
 #include <net/netfilter/nft_meta.h>
 
-#if defined(CONFIG_MITIGATION_RETPOLINE) && defined(CONFIG_X86)
-
+#ifdef CONFIG_MITIGATION_RETPOLINE
 static struct static_key_false nf_tables_skip_direct_calls;
 
-static bool nf_skip_indirect_calls(void)
+static inline bool nf_skip_indirect_calls(void)
 {
 	return static_branch_likely(&nf_tables_skip_direct_calls);
 }
 
-static void __init nf_skip_indirect_calls_enable(void)
+static inline void __init nf_skip_indirect_calls_enable(void)
 {
 	if (!cpu_feature_enabled(X86_FEATURE_RETPOLINE))
 		static_branch_enable(&nf_tables_skip_direct_calls);
 }
-#else
-static inline bool nf_skip_indirect_calls(void) { return false; }
-
-static inline void nf_skip_indirect_calls_enable(void) { }
-#endif
+#endif /* CONFIG_MITIGATION_RETPOLINE */
 
 static noinline void __nft_trace_packet(const struct nft_pktinfo *pkt,
 					const struct nft_verdict *verdict,
@@ -393,7 +388,9 @@ int __init nf_tables_core_module_init(void)
 			goto err;
 	}
 
+#ifdef CONFIG_MITIGATION_RETPOLINE
 	nf_skip_indirect_calls_enable();
+#endif /* CONFIG_MITIGATION_RETPOLINE */
 
 	return 0;
 
-- 
2.49.0