Messages in this thread Patch in this message |  | | Date | Sun, 30 Apr 2017 02:44:55 -0700 | From | tip-bot for Sebastian Andrzej Siewior <> | Subject | [tip:smp/hotplug] jump_label: Provide static_key_[enable|/slow_inc]_cpuslocked() |
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Commit-ID: 2006cddf3c2fd6b4114c704229552a903f180c71 Gitweb: http://git.kernel.org/tip/2006cddf3c2fd6b4114c704229552a903f180c71 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> AuthorDate: Fri, 28 Apr 2017 12:01:05 +0100 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Sun, 30 Apr 2017 11:19:01 +0200
jump_label: Provide static_key_[enable|/slow_inc]_cpuslocked()
Provide static_key_[enable|slow_inc]_cpuslocked() variant that don't take cpu_hotplug_lock().
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: suzuki.poulose@arm.com Cc: peterz@infradead.org Cc: catalin.marinas@arm.com Cc: will.deacon@arm.com Cc: rostedt@goodmis.org Cc: jbaron@akamai.com Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1493377266-2205-2-git-send-email-mark.rutland@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
--- include/linux/jump_label.h | 7 +++++++ kernel/jump_label.c | 10 ++++++++++ 2 files changed, 17 insertions(+)
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h index d7b17d1..c80d8b1 100644 --- a/include/linux/jump_label.h +++ b/include/linux/jump_label.h @@ -164,6 +164,7 @@ extern void static_key_slow_dec_cpuslocked(struct static_key *key); extern void jump_label_apply_nops(struct module *mod); extern int static_key_count(struct static_key *key); extern void static_key_enable(struct static_key *key); +extern void static_key_enable_cpuslocked(struct static_key *key); extern void static_key_disable(struct static_key *key); extern void static_key_disable_cpuslocked(struct static_key *key); @@ -252,6 +253,11 @@ static inline void static_key_enable(struct static_key *key) static_key_slow_inc(key); } +static inline void static_key_enable_cpuslocked(struct static_key *key) +{ + static_key_enable(key); +} + static inline void static_key_disable(struct static_key *key) { int count = static_key_count(key); @@ -429,6 +435,7 @@ extern bool ____wrong_branch_error(void); */ #define static_branch_enable(x) static_key_enable(&(x)->key) +#define static_branch_enable_cpuslocked(x) static_key_enable_cpuslocked(&(x)->key) #define static_branch_disable(x) static_key_disable(&(x)->key) #define static_branch_disable_cpuslocked(x) static_key_disable_cpuslocked(&(x)->key) diff --git a/kernel/jump_label.c b/kernel/jump_label.c index d71124e..6343f4c 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -90,6 +90,16 @@ void static_key_enable(struct static_key *key) } EXPORT_SYMBOL_GPL(static_key_enable); +void static_key_enable_cpuslocked(struct static_key *key) +{ + int count = static_key_count(key); + + WARN_ON_ONCE(count < 0 || count > 1); + + if (!count) + static_key_slow_inc_cpuslocked(key); +} + void static_key_disable(struct static_key *key) { int count = static_key_count(key);
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