Commit-ID: 2006cddf3c2fd6b4114c704229552a903f180c71
Gitweb: http://git.kernel.org/tip/2006cddf3c2fd6b4114c704229552a903f180c71
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
AuthorDate: Fri, 28 Apr 2017 12:01:05 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
Cc: suzuki.poulose@xxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: catalin.marinas@xxxxxxx
Cc: will.deacon@xxxxxxx
Cc: rostedt@xxxxxxxxxxx
Cc: jbaron@xxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1493377266-2205-2-git-send-email-mark.rutland@xxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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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