| Message ID | 568612395203CC2F+20250319140147.1862336-1-wangyuli@uniontech.com (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [net,v2] netfilter: nf_tables: Only use nf_skip_indirect_calls() when MITIGATION_RETPOLINE | expand |
WangYuli <wangyuli@uniontech.com> wrote: > 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. > > 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@uniontech.com> > Signed-off-by: Wentao Guan <guanwentao@uniontech.com> > Signed-off-by: WangYuli <wangyuli@uniontech.com> Acked-by: Florian Westphal <fw@strlen.de>
diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c index 75598520b0fa..6557a4018c09 100644 --- a/net/netfilter/nf_tables_core.c +++ b/net/netfilter/nf_tables_core.c @@ -21,25 +21,22 @@ #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,
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. 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@uniontech.com> Signed-off-by: Wentao Guan <guanwentao@uniontech.com> Signed-off-by: WangYuli <wangyuli@uniontech.com> --- Changelog: *v1->v2: Avoid the extra CONFIG_MITIGATION_RETPOLINE. --- net/netfilter/nf_tables_core.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)