ad282a8117
Add deferred static branches. We can't unfortunately use the nice trick of encapsulating the entire structure in true/false variants, because the inside has to be either struct static_key_true or struct static_key_false. Use defines to pass the appropriate members to the helpers separately. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Simon Horman <simon.horman@netronome.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: alexei.starovoitov@gmail.com Cc: ard.biesheuvel@linaro.org Cc: oss-drivers@netronome.com Cc: yamada.masahiro@socionext.com Link: https://lkml.kernel.org/r/20190330000854.30142-2-jakub.kicinski@netronome.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_JUMP_LABEL_RATELIMIT_H
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#define _LINUX_JUMP_LABEL_RATELIMIT_H
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#include <linux/jump_label.h>
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#include <linux/workqueue.h>
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#if defined(CONFIG_JUMP_LABEL)
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struct static_key_deferred {
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struct static_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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struct static_key_true_deferred {
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struct static_key_true key;
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unsigned long timeout;
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struct delayed_work work;
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};
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struct static_key_false_deferred {
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struct static_key_false key;
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unsigned long timeout;
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struct delayed_work work;
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};
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#define static_key_slow_dec_deferred(x) \
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__static_key_slow_dec_deferred(&(x)->key, &(x)->work, (x)->timeout)
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#define static_branch_slow_dec_deferred(x) \
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__static_key_slow_dec_deferred(&(x)->key.key, &(x)->work, (x)->timeout)
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#define static_key_deferred_flush(x) \
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__static_key_deferred_flush((x), &(x)->work)
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extern void
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__static_key_slow_dec_deferred(struct static_key *key,
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struct delayed_work *work,
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unsigned long timeout);
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extern void __static_key_deferred_flush(void *key, struct delayed_work *work);
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extern void
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jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
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extern void jump_label_update_timeout(struct work_struct *work);
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#define DEFINE_STATIC_KEY_DEFERRED_TRUE(name, rl) \
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struct static_key_true_deferred name = { \
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.key = { STATIC_KEY_INIT_TRUE }, \
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.timeout = (rl), \
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.work = __DELAYED_WORK_INITIALIZER((name).work, \
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jump_label_update_timeout, \
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0), \
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}
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#define DEFINE_STATIC_KEY_DEFERRED_FALSE(name, rl) \
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struct static_key_false_deferred name = { \
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.key = { STATIC_KEY_INIT_FALSE }, \
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.timeout = (rl), \
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.work = __DELAYED_WORK_INITIALIZER((name).work, \
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jump_label_update_timeout, \
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0), \
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}
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#define static_branch_deferred_inc(x) static_branch_inc(&(x)->key)
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#else /* !CONFIG_JUMP_LABEL */
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struct static_key_deferred {
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struct static_key key;
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};
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struct static_key_true_deferred {
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struct static_key_true key;
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};
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struct static_key_false_deferred {
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struct static_key_false key;
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};
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#define DEFINE_STATIC_KEY_DEFERRED_TRUE(name, rl) \
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struct static_key_true_deferred name = { STATIC_KEY_TRUE_INIT }
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#define DEFINE_STATIC_KEY_DEFERRED_FALSE(name, rl) \
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struct static_key_false_deferred name = { STATIC_KEY_FALSE_INIT }
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#define static_branch_slow_dec_deferred(x) static_branch_dec(&(x)->key)
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static inline void static_key_slow_dec_deferred(struct static_key_deferred *key)
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{
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STATIC_KEY_CHECK_USE(key);
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static_key_slow_dec(&key->key);
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}
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static inline void static_key_deferred_flush(void *key)
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{
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STATIC_KEY_CHECK_USE(key);
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}
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static inline void
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jump_label_rate_limit(struct static_key_deferred *key,
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unsigned long rl)
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{
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STATIC_KEY_CHECK_USE(key);
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}
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#endif /* CONFIG_JUMP_LABEL */
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#endif /* _LINUX_JUMP_LABEL_RATELIMIT_H */
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