[PATCH v2 3/5] static_key: add static_key_slow_inc_deferred()

[Radim Krčmář]

Complement the static_key_slow_dec_deferred().
This avoids asymmetrical API, and prepares us for future optimizations
and bug fixes.

Signed-off-by: Radim Krčmář <rkrc...@redhat.com>
---
 arch/x86/kvm/lapic.c                 | 7 ++++---
 include/linux/jump_label_ratelimit.h | 5 +++++
 kernel/events/core.c                 | 6 +++---
 kernel/jump_label.c                  | 7 +++++++
 4 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 5f01547..86973ac 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -121,7 +121,7 @@ static inline void apic_set_spiv(struct kvm_lapic *apic, 
u32 val)
                if (val & APIC_SPIV_APIC_ENABLED)
                        static_key_slow_dec_deferred(&apic_sw_disabled);
                else
-                       static_key_slow_inc(&apic_sw_disabled.key);
+                       static_key_slow_inc_deferred(&apic_sw_disabled);
        }
        apic_set_reg(apic, APIC_SPIV, val);
 }
@@ -1351,7 +1351,7 @@ void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
                if (value & MSR_IA32_APICBASE_ENABLE)
                        static_key_slow_dec_deferred(&apic_hw_disabled);
                else
-                       static_key_slow_inc(&apic_hw_disabled.key);
+                       static_key_slow_inc_deferred(&apic_hw_disabled);
                recalculate_apic_map(vcpu->kvm);
        }
 
@@ -1546,7 +1546,8 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
        kvm_lapic_set_base(vcpu,
                        APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE);
 
-       static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */
+       /* sw disabled at reset */
+       static_key_slow_inc_deferred(&apic_sw_disabled);
        kvm_lapic_reset(vcpu);
        kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
 
diff --git a/include/linux/jump_label_ratelimit.h 
b/include/linux/jump_label_ratelimit.h
index 112ba5f..a18aded 100644
--- a/include/linux/jump_label_ratelimit.h
+++ b/include/linux/jump_label_ratelimit.h
@@ -18,6 +18,7 @@ struct static_key_deferred {
 #endif
 
 #ifdef HAVE_JUMP_LABEL
+extern void static_key_slow_inc_deferred(struct static_key_deferred *key);
 extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
 extern void
 jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
@@ -26,6 +27,10 @@ jump_label_rate_limit(struct static_key_deferred *key, 
unsigned long rl);
 struct static_key_deferred {
        struct static_key  key;
 };
+static inline void static_key_slow_inc_deferred(struct static_key_deferred 
*key)
+{
+       static_key_slow_inc(&key->key);
+}
 static inline void static_key_slow_dec_deferred(struct static_key_deferred 
*key)
 {
        STATIC_KEY_CHECK_USE();
diff --git a/kernel/events/core.c b/kernel/events/core.c
index ee64d26..b3fb4c2 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6597,7 +6597,7 @@ static void account_event(struct perf_event *event)
                return;
 
        if (event->attach_state & PERF_ATTACH_TASK)
-               static_key_slow_inc(&perf_sched_events.key);
+               static_key_slow_inc_deferred(&perf_sched_events);
        if (event->attr.mmap || event->attr.mmap_data)
                atomic_inc(&nr_mmap_events);
        if (event->attr.comm)
@@ -6609,9 +6609,9 @@ static void account_event(struct perf_event *event)
                        tick_nohz_full_kick_all();
        }
        if (has_branch_stack(event))
-               static_key_slow_inc(&perf_sched_events.key);
+               static_key_slow_inc_deferred(&perf_sched_events);
        if (is_cgroup_event(event))
-               static_key_slow_inc(&perf_sched_events.key);
+               static_key_slow_inc_deferred(&perf_sched_events);
 
        account_event_cpu(event, event->cpu);
 }
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 02d610a..41592ba 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -74,6 +74,13 @@ void static_key_slow_inc(struct static_key *key)
 }
 EXPORT_SYMBOL_GPL(static_key_slow_inc);
 
+void static_key_slow_inc_deferred(struct static_key_deferred *key)
+{
+       STATIC_KEY_CHECK_USE();
+       static_key_slow_inc(&key->key);
+}
+EXPORT_SYMBOL_GPL(static_key_slow_inc_deferred);
+
 static void __static_key_slow_dec(struct static_key *key,
                unsigned long rate_limit, struct delayed_work *work)
 {
-- 
1.8.4.2

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