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https://github.com/edk2-porting/linux-next.git
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ac99b862fb
Provide two initializers for jump_label_key that initialize it enabled or disabled. Also modify all jump_label code to allow for jump_labels to be initialized enabled. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Jason Baron <jbaron@redhat.com> Link: http://lkml.kernel.org/n/tip-p40e3yj21b68y03z1yv825e7@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
#ifndef _LINUX_JUMP_LABEL_H
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#define _LINUX_JUMP_LABEL_H
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <linux/workqueue.h>
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#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
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struct jump_label_key {
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atomic_t enabled;
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struct jump_entry *entries;
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#ifdef CONFIG_MODULES
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struct jump_label_mod *next;
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#endif
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};
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struct jump_label_key_deferred {
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struct jump_label_key key;
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unsigned long timeout;
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struct delayed_work work;
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};
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# include <asm/jump_label.h>
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# define HAVE_JUMP_LABEL
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#endif /* CC_HAVE_ASM_GOTO && CONFIG_JUMP_LABEL */
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enum jump_label_type {
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JUMP_LABEL_DISABLE = 0,
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JUMP_LABEL_ENABLE,
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};
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struct module;
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#ifdef HAVE_JUMP_LABEL
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#ifdef CONFIG_MODULES
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#define JUMP_LABEL_INIT {ATOMIC_INIT(0), NULL, NULL}
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#else
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#define JUMP_LABEL_INIT {ATOMIC_INIT(0), NULL}
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#endif
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static __always_inline bool static_branch(struct jump_label_key *key)
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{
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return arch_static_branch(key);
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}
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extern struct jump_entry __start___jump_table[];
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extern struct jump_entry __stop___jump_table[];
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extern void jump_label_init(void);
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extern void jump_label_lock(void);
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extern void jump_label_unlock(void);
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extern void arch_jump_label_transform(struct jump_entry *entry,
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enum jump_label_type type);
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extern void arch_jump_label_transform_static(struct jump_entry *entry,
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enum jump_label_type type);
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extern int jump_label_text_reserved(void *start, void *end);
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extern void jump_label_inc(struct jump_label_key *key);
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extern void jump_label_dec(struct jump_label_key *key);
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extern void jump_label_dec_deferred(struct jump_label_key_deferred *key);
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extern bool jump_label_enabled(struct jump_label_key *key);
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extern void jump_label_apply_nops(struct module *mod);
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extern void jump_label_rate_limit(struct jump_label_key_deferred *key,
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unsigned long rl);
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#else /* !HAVE_JUMP_LABEL */
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#include <linux/atomic.h>
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#define JUMP_LABEL_INIT {ATOMIC_INIT(0)}
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struct jump_label_key {
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atomic_t enabled;
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};
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static __always_inline void jump_label_init(void)
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{
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}
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struct jump_label_key_deferred {
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struct jump_label_key key;
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};
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static __always_inline bool static_branch(struct jump_label_key *key)
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{
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if (unlikely(atomic_read(&key->enabled)))
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return true;
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return false;
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}
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static inline void jump_label_inc(struct jump_label_key *key)
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{
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atomic_inc(&key->enabled);
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}
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static inline void jump_label_dec(struct jump_label_key *key)
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{
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atomic_dec(&key->enabled);
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}
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static inline void jump_label_dec_deferred(struct jump_label_key_deferred *key)
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{
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jump_label_dec(&key->key);
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}
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static inline int jump_label_text_reserved(void *start, void *end)
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{
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return 0;
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}
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static inline void jump_label_lock(void) {}
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static inline void jump_label_unlock(void) {}
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static inline bool jump_label_enabled(struct jump_label_key *key)
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{
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return !!atomic_read(&key->enabled);
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}
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static inline int jump_label_apply_nops(struct module *mod)
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{
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return 0;
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}
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static inline void jump_label_rate_limit(struct jump_label_key_deferred *key,
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unsigned long rl)
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{
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}
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#endif /* HAVE_JUMP_LABEL */
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#define jump_label_key_enabled ((struct jump_label_key){ .enabled = ATOMIC_INIT(1), })
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#define jump_label_key_disabled ((struct jump_label_key){ .enabled = ATOMIC_INIT(0), })
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#endif /* _LINUX_JUMP_LABEL_H */
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