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jump_label: move 'asm goto' support test to Kconfig

Browse source 
Currently, CONFIG_JUMP_LABEL just means "I _want_ to use jump label".

The jump label is controlled by HAVE_JUMP_LABEL, which is defined
like this:

  #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
  # define HAVE_JUMP_LABEL
  #endif

We can improve this by testing 'asm goto' support in Kconfig, then
make JUMP_LABEL depend on CC_HAS_ASM_GOTO.

Ugly #ifdef HAVE_JUMP_LABEL will go away, and CONFIG_JUMP_LABEL will
match to the real kernel capability.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
This commit is contained in:
Masahiro Yamada 2018-12-31 00:14:15 +09:00
commit e9666d10a5
42 changed files with 65 additions and 119 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/linux/dynamic_debug.h
View file

@ -2,7 +2,7 @@
#ifndef _DYNAMIC_DEBUG_H
#define _DYNAMIC_DEBUG_H
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
#if defined(CONFIG_JUMP_LABEL)
#include <linux/jump_label.h>
#endif
@ -38,7 +38,7 @@ struct _ddebug {
#define _DPRINTK_FLAGS_DEFAULT 0
#endif
unsigned int flags:8;
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
union {
struct static_key_true dd_key_true;
struct static_key_false dd_key_false;
@ -83,7 +83,7 @@ void __dynamic_netdev_dbg(struct _ddebug *descriptor,
dd_key_init(key, init) \
}
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
#define dd_key_init(key, init) key = (init)

22
include/linux/jump_label.h
View file

@ -71,10 +71,6 @@
* Additional babbling in: Documentation/static-keys.txt
*/
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
# define HAVE_JUMP_LABEL
#endif
#ifndef __ASSEMBLY__
#include <linux/types.h>
@ -86,7 +82,7 @@ extern bool static_key_initialized;
"%s(): static key '%pS' used before call to jump_label_init()", \
__func__, (key))
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
struct static_key {
atomic_t enabled;
@ -114,10 +110,10 @@ struct static_key {
struct static_key {
atomic_t enabled;
};
#endif /* HAVE_JUMP_LABEL */
#endif /* CONFIG_JUMP_LABEL */
#endif /* __ASSEMBLY__ */
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
#include <asm/jump_label.h>
#ifndef __ASSEMBLY__
@ -192,7 +188,7 @@ enum jump_label_type {
struct module;
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
#define JUMP_TYPE_FALSE 0UL
#define JUMP_TYPE_TRUE 1UL
@ -245,7 +241,7 @@ extern void static_key_disable_cpuslocked(struct static_key *key);
{ .enabled = { 0 }, \
{ .entries = (void *)JUMP_TYPE_FALSE } }
#else /* !HAVE_JUMP_LABEL */
#else /* !CONFIG_JUMP_LABEL */
#include <linux/atomic.h>
#include <linux/bug.h>
@ -330,7 +326,7 @@ static inline void static_key_disable(struct static_key *key)
#define STATIC_KEY_INIT_TRUE { .enabled = ATOMIC_INIT(1) }
#define STATIC_KEY_INIT_FALSE { .enabled = ATOMIC_INIT(0) }
#endif /* HAVE_JUMP_LABEL */
#endif /* CONFIG_JUMP_LABEL */
#define STATIC_KEY_INIT STATIC_KEY_INIT_FALSE
#define jump_label_enabled static_key_enabled
@ -394,7 +390,7 @@ extern bool ____wrong_branch_error(void);
static_key_count((struct static_key *)x) > 0; \
})
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
/*
* Combine the right initial value (type) with the right branch order
@ -476,12 +472,12 @@ extern bool ____wrong_branch_error(void);
unlikely(branch); \
})
#else /* !HAVE_JUMP_LABEL */
#else /* !CONFIG_JUMP_LABEL */
#define static_branch_likely(x) likely(static_key_enabled(&(x)->key))
#define static_branch_unlikely(x) unlikely(static_key_enabled(&(x)->key))
#endif /* HAVE_JUMP_LABEL */
#endif /* CONFIG_JUMP_LABEL */
/*
* Advanced usage; refcount, branch is enabled when: count != 0

8
include/linux/jump_label_ratelimit.h
View file

@ -5,21 +5,19 @@
#include <linux/jump_label.h>
#include <linux/workqueue.h>
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
#if defined(CONFIG_JUMP_LABEL)
struct static_key_deferred {
struct static_key key;
unsigned long timeout;
struct delayed_work work;
};
#endif
#ifdef HAVE_JUMP_LABEL
extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
extern void static_key_deferred_flush(struct static_key_deferred *key);
extern void
jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
#else /* !HAVE_JUMP_LABEL */
#else /* !CONFIG_JUMP_LABEL */
struct static_key_deferred {
struct static_key key;
};
@ -38,5 +36,5 @@ jump_label_rate_limit(struct static_key_deferred *key,
{
STATIC_KEY_CHECK_USE(key);
}
#endif /* HAVE_JUMP_LABEL */
#endif /* CONFIG_JUMP_LABEL */
#endif /* _LINUX_JUMP_LABEL_RATELIMIT_H */

2
include/linux/module.h
View file

@ -436,7 +436,7 @@ struct module {
unsigned int num_bpf_raw_events;
struct bpf_raw_event_map *bpf_raw_events;
#endif
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
struct jump_entry *jump_entries;
unsigned int num_jump_entries;
#endif

4
include/linux/netfilter.h
View file

@ -176,7 +176,7 @@ void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
int nf_register_sockopt(struct nf_sockopt_ops *reg);
void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
#endif
@ -198,7 +198,7 @@ static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
struct nf_hook_entries *hook_head = NULL;
int ret = 1;
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
if (__builtin_constant_p(pf) &&
__builtin_constant_p(hook) &&
!static_key_false(&nf_hooks_needed[pf][hook]))

2
include/linux/netfilter_ingress.h
View file

@ -8,7 +8,7 @@
#ifdef CONFIG_NETFILTER_INGRESS
static inline bool nf_hook_ingress_active(const struct sk_buff *skb)
{
#ifdef HAVE_JUMP_LABEL
#ifdef CONFIG_JUMP_LABEL
if (!static_key_false(&nf_hooks_needed[NFPROTO_NETDEV][NF_NETDEV_INGRESS]))
return false;
#endif