[PATCH 1/1] netfilter/jump_label: use HAVE_JUMP_LABEL?
From: Zhouyi Zhou <hidden>
Date: 2014-08-21 02:53:31
Also in:
lkml, netfilter-devel
Subsystem:
netfilter, networking [general], the rest · Maintainers:
Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
CONFIG_JUMP_LABEL doesn't ensure HAVE_JUMP_LABEL, if it is not the case use maintainers's own mutex to guard the modification of global values. Signed-off-by: Zhouyi Zhou <redacted> --- include/linux/netfilter.h | 5 +++-- net/netfilter/core.c | 6 +++--- 2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h
index 2077489..83a1952 100644
--- a/include/linux/netfilter.h
+++ b/include/linux/netfilter.h@@ -9,6 +9,7 @@ #include <linux/in6.h> #include <linux/wait.h> #include <linux/list.h> +#include <linux/static_key.h> #include <uapi/linux/netfilter.h> #ifdef CONFIG_NETFILTER static inline int NF_DROP_GETERR(int verdict)
@@ -99,8 +100,8 @@ void nf_unregister_sockopt(struct nf_sockopt_ops *reg); extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; -#if defined(CONFIG_JUMP_LABEL) -#include <linux/static_key.h> +#ifdef HAVE_JUMP_LABEL + extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) {
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index a93c97f..024a2e2 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c@@ -54,7 +54,7 @@ EXPORT_SYMBOL_GPL(nf_unregister_afinfo); struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS] __read_mostly; EXPORT_SYMBOL(nf_hooks); -#if defined(CONFIG_JUMP_LABEL) +#ifdef HAVE_JUMP_LABEL struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; EXPORT_SYMBOL(nf_hooks_needed); #endif
@@ -72,7 +72,7 @@ int nf_register_hook(struct nf_hook_ops *reg) } list_add_rcu(®->list, elem->list.prev); mutex_unlock(&nf_hook_mutex); -#if defined(CONFIG_JUMP_LABEL) +#ifdef HAVE_JUMP_LABEL static_key_slow_inc(&nf_hooks_needed[reg->pf][reg->hooknum]); #endif return 0;
@@ -84,7 +84,7 @@ void nf_unregister_hook(struct nf_hook_ops *reg) mutex_lock(&nf_hook_mutex); list_del_rcu(®->list); mutex_unlock(&nf_hook_mutex); -#if defined(CONFIG_JUMP_LABEL) +#ifdef HAVE_JUMP_LABEL static_key_slow_dec(&nf_hooks_needed[reg->pf][reg->hooknum]); #endif synchronize_net();
--
1.7.10.4