Linus,
please pull the latest core/debugobjects branch from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
core-debugobjects-2020-10-12
up to: 88451f2cd3ce: debugobjects: Free per CPU pool after CPU unplug
A small set of updates for debug objects:
- Make all debug object descriptors constant. There is no reason to have
them writeable.
- Free the per CPU object pool after CPU unplug to avoid memory waste.
Thanks,
tglx
------------------>
Stephen Boyd (2):
debugobjects: Allow debug_obj_descr to be const
treewide: Make all debug_obj_descriptors const
Zqiang (1):
debugobjects: Free per CPU pool after CPU unplug
drivers/gpu/drm/i915/i915_active.c | 2 +-
drivers/gpu/drm/i915/i915_sw_fence.c | 2 +-
include/linux/cpuhotplug.h | 1 +
include/linux/debugobjects.h | 32 ++++++++++-----------
kernel/rcu/rcu.h | 2 +-
kernel/rcu/update.c | 2 +-
kernel/time/hrtimer.c | 4 +--
kernel/time/timer.c | 4 +--
kernel/workqueue.c | 4 +--
lib/debugobjects.c | 55 ++++++++++++++++++++++++++----------
lib/percpu_counter.c | 4 +--
11 files changed, 69 insertions(+), 43 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_active.c
b/drivers/gpu/drm/i915/i915_active.c
index d960d0be5bd2..839bd53df6e9 100644
--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -81,7 +81,7 @@ static void *active_debug_hint(void *addr)
return (void *)ref->active ?: (void *)ref->retire ?: (void *)ref;
}
-static struct debug_obj_descr active_debug_desc = {
+static const struct debug_obj_descr active_debug_desc = {
.name = "i915_active",
.debug_hint = active_debug_hint,
};
diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c
b/drivers/gpu/drm/i915/i915_sw_fence.c
index 4cd2038cbe35..038d4c6884c5 100644
--- a/drivers/gpu/drm/i915/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence.c
@@ -34,7 +34,7 @@ static void *i915_sw_fence_debug_hint(void *addr)
#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
-static struct debug_obj_descr i915_sw_fence_debug_descr = {
+static const struct debug_obj_descr i915_sw_fence_debug_descr = {
.name = "i915_sw_fence",
.debug_hint = i915_sw_fence_debug_hint,
};
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index bf9181cef444..6f524bbf71a2 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -36,6 +36,7 @@ enum cpuhp_state {
CPUHP_X86_MCE_DEAD,
CPUHP_VIRT_NET_DEAD,
CPUHP_SLUB_DEAD,
+ CPUHP_DEBUG_OBJ_DEAD,
CPUHP_MM_WRITEBACK_DEAD,
CPUHP_MM_VMSTAT_DEAD,
CPUHP_SOFTIRQ_DEAD,
diff --git a/include/linux/debugobjects.h b/include/linux/debugobjects.h
index afc416e5dcab..8d2dde23e9fb 100644
--- a/include/linux/debugobjects.h
+++ b/include/linux/debugobjects.h
@@ -30,7 +30,7 @@ struct debug_obj {
enum debug_obj_state state;
unsigned int astate;
void *object;
- struct debug_obj_descr *descr;
+ const struct debug_obj_descr *descr;
};
/**
@@ -64,14 +64,14 @@ struct debug_obj_descr {
};
#ifdef CONFIG_DEBUG_OBJECTS
-extern void debug_object_init (void *addr, struct debug_obj_descr *descr);
+extern void debug_object_init (void *addr, const struct debug_obj_descr
*descr);
extern void
-debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr);
-extern int debug_object_activate (void *addr, struct debug_obj_descr *descr);
-extern void debug_object_deactivate(void *addr, struct debug_obj_descr *descr);
-extern void debug_object_destroy (void *addr, struct debug_obj_descr *descr);
-extern void debug_object_free (void *addr, struct debug_obj_descr *descr);
-extern void debug_object_assert_init(void *addr, struct debug_obj_descr
*descr);
+debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr);
+extern int debug_object_activate (void *addr, const struct debug_obj_descr
*descr);
+extern void debug_object_deactivate(void *addr, const struct debug_obj_descr
*descr);
+extern void debug_object_destroy (void *addr, const struct debug_obj_descr
*descr);
+extern void debug_object_free (void *addr, const struct debug_obj_descr
*descr);
+extern void debug_object_assert_init(void *addr, const struct debug_obj_descr
*descr);
/*
* Active state:
@@ -79,26 +79,26 @@ extern void debug_object_assert_init(void *addr, struct
debug_obj_descr *descr);
* - Must return to 0 before deactivation.
*/
extern void
-debug_object_active_state(void *addr, struct debug_obj_descr *descr,
+debug_object_active_state(void *addr, const struct debug_obj_descr *descr,
unsigned int expect, unsigned int next);
extern void debug_objects_early_init(void);
extern void debug_objects_mem_init(void);
#else
static inline void
-debug_object_init (void *addr, struct debug_obj_descr *descr) { }
+debug_object_init (void *addr, const struct debug_obj_descr *descr) { }
static inline void
-debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr) { }
+debug_object_init_on_stack(void *addr, const struct debug_obj_descr *descr) { }
static inline int
-debug_object_activate (void *addr, struct debug_obj_descr *descr) { return 0;
}
+debug_object_activate (void *addr, const struct debug_obj_descr *descr) {
return 0; }
static inline void
-debug_object_deactivate(void *addr, struct debug_obj_descr *descr) { }
+debug_object_deactivate(void *addr, const struct debug_obj_descr *descr) { }
static inline void
-debug_object_destroy (void *addr, struct debug_obj_descr *descr) { }
+debug_object_destroy (void *addr, const struct debug_obj_descr *descr) { }
static inline void
-debug_object_free (void *addr, struct debug_obj_descr *descr) { }
+debug_object_free (void *addr, const struct debug_obj_descr *descr) { }
static inline void
-debug_object_assert_init(void *addr, struct debug_obj_descr *descr) { }
+debug_object_assert_init(void *addr, const struct debug_obj_descr *descr) { }
static inline void debug_objects_early_init(void) { }
static inline void debug_objects_mem_init(void) { }
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h
index cf66a3ccd757..e01cba5e4b52 100644
--- a/kernel/rcu/rcu.h
+++ b/kernel/rcu/rcu.h
@@ -167,7 +167,7 @@ static inline unsigned long rcu_seq_diff(unsigned long new,
unsigned long old)
# define STATE_RCU_HEAD_READY 0
# define STATE_RCU_HEAD_QUEUED 1
-extern struct debug_obj_descr rcuhead_debug_descr;
+extern const struct debug_obj_descr rcuhead_debug_descr;
static inline int debug_rcu_head_queue(struct rcu_head *head)
{
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 2de49b5d8dd2..3e0f4bcb558f 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -469,7 +469,7 @@ void destroy_rcu_head_on_stack(struct rcu_head *head)
}
EXPORT_SYMBOL_GPL(destroy_rcu_head_on_stack);
-struct debug_obj_descr rcuhead_debug_descr = {
+const struct debug_obj_descr rcuhead_debug_descr = {
.name = "rcu_head",
.is_static_object = rcuhead_is_static_object,
};
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 95b6a708b040..3624b9b5835d 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -342,7 +342,7 @@ EXPORT_SYMBOL_GPL(ktime_add_safe);
#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
-static struct debug_obj_descr hrtimer_debug_descr;
+static const struct debug_obj_descr hrtimer_debug_descr;
static void *hrtimer_debug_hint(void *addr)
{
@@ -401,7 +401,7 @@ static bool hrtimer_fixup_free(void *addr, enum
debug_obj_state state)
}
}
-static struct debug_obj_descr hrtimer_debug_descr = {
+static const struct debug_obj_descr hrtimer_debug_descr = {
.name = "hrtimer",
.debug_hint = hrtimer_debug_hint,
.fixup_init = hrtimer_fixup_init,
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index a50364df1054..8b17cf28e54b 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -611,7 +611,7 @@ static void internal_add_timer(struct timer_base *base,
struct timer_list *timer
#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
-static struct debug_obj_descr timer_debug_descr;
+static const struct debug_obj_descr timer_debug_descr;
static void *timer_debug_hint(void *addr)
{
@@ -707,7 +707,7 @@ static bool timer_fixup_assert_init(void *addr, enum
debug_obj_state state)
}
}
-static struct debug_obj_descr timer_debug_descr = {
+static const struct debug_obj_descr timer_debug_descr = {
.name = "timer_list",
.debug_hint = timer_debug_hint,
.is_static_object = timer_is_static_object,
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index c41c3c17b86a..ac088ce6059b 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -427,7 +427,7 @@ static void show_pwq(struct pool_workqueue *pwq);
#ifdef CONFIG_DEBUG_OBJECTS_WORK
-static struct debug_obj_descr work_debug_descr;
+static const struct debug_obj_descr work_debug_descr;
static void *work_debug_hint(void *addr)
{
@@ -477,7 +477,7 @@ static bool work_fixup_free(void *addr, enum
debug_obj_state state)
}
}
-static struct debug_obj_descr work_debug_descr = {
+static const struct debug_obj_descr work_debug_descr = {
.name = "work_struct",
.debug_hint = work_debug_hint,
.is_static_object = work_is_static_object,
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index fe4557955d97..9e14ae02306b 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <linux/hash.h>
#include <linux/kmemleak.h>
+#include <linux/cpu.h>
#define ODEBUG_HASH_BITS 14
#define ODEBUG_HASH_SIZE (1 << ODEBUG_HASH_BITS)
@@ -90,7 +91,7 @@ static int debug_objects_pool_size
__read_mostly
= ODEBUG_POOL_SIZE;
static int debug_objects_pool_min_level __read_mostly
= ODEBUG_POOL_MIN_LEVEL;
-static struct debug_obj_descr *descr_test __read_mostly;
+static const struct debug_obj_descr *descr_test __read_mostly;
static struct kmem_cache *obj_cache __read_mostly;
/*
@@ -223,7 +224,7 @@ static struct debug_obj *__alloc_object(struct hlist_head
*list)
* Must be called with interrupts disabled.
*/
static struct debug_obj *
-alloc_object(void *addr, struct debug_bucket *b, struct debug_obj_descr *descr)
+alloc_object(void *addr, struct debug_bucket *b, const struct debug_obj_descr
*descr)
{
struct debug_percpu_free *percpu_pool = this_cpu_ptr(&percpu_obj_pool);
struct debug_obj *obj;
@@ -433,6 +434,25 @@ static void free_object(struct debug_obj *obj)
}
}
+#ifdef CONFIG_HOTPLUG_CPU
+static int object_cpu_offline(unsigned int cpu)
+{
+ struct debug_percpu_free *percpu_pool;
+ struct hlist_node *tmp;
+ struct debug_obj *obj;
+
+ /* Remote access is safe as the CPU is dead already */
+ percpu_pool = per_cpu_ptr(&percpu_obj_pool, cpu);
+ hlist_for_each_entry_safe(obj, tmp, &percpu_pool->free_objs, node) {
+ hlist_del(&obj->node);
+ kmem_cache_free(obj_cache, obj);
+ }
+ percpu_pool->obj_free = 0;
+
+ return 0;
+}
+#endif
+
/*
* We run out of memory. That means we probably have tons of objects
* allocated.
@@ -475,7 +495,7 @@ static struct debug_bucket *get_bucket(unsigned long addr)
static void debug_print_object(struct debug_obj *obj, char *msg)
{
- struct debug_obj_descr *descr = obj->descr;
+ const struct debug_obj_descr *descr = obj->descr;
static int limit;
if (limit < 5 && descr != descr_test) {
@@ -529,7 +549,7 @@ static void debug_object_is_on_stack(void *addr, int
onstack)
}
static void
-__debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack)
+__debug_object_init(void *addr, const struct debug_obj_descr *descr, int
onstack)
{
enum debug_obj_state state;
bool check_stack = false;
@@ -587,7 +607,7 @@ __debug_object_init(void *addr, struct debug_obj_descr
*descr, int onstack)
* @addr: address of the object
* @descr: pointer to an object specific debug description structure
*/
-void debug_object_init(void *addr, struct debug_obj_descr *descr)
+void debug_object_init(void *addr, const struct debug_obj_descr *descr)
{
if (!debug_objects_enabled)
return;
@@ -602,7 +622,7 @@ EXPORT_SYMBOL_GPL(debug_object_init);
* @addr: address of the object
* @descr: pointer to an object specific debug description structure
*/
-void debug_object_init_on_stack(void *addr, struct debug_obj_descr *descr)
+void debug_object_init_on_stack(void *addr, const struct debug_obj_descr
*descr)
{
if (!debug_objects_enabled)
return;
@@ -617,7 +637,7 @@ EXPORT_SYMBOL_GPL(debug_object_init_on_stack);
* @descr: pointer to an object specific debug description structure
* Returns 0 for success, -EINVAL for check failed.
*/
-int debug_object_activate(void *addr, struct debug_obj_descr *descr)
+int debug_object_activate(void *addr, const struct debug_obj_descr *descr)
{
enum debug_obj_state state;
struct debug_bucket *db;
@@ -695,7 +715,7 @@ EXPORT_SYMBOL_GPL(debug_object_activate);
* @addr: address of the object
* @descr: pointer to an object specific debug description structure
*/
-void debug_object_deactivate(void *addr, struct debug_obj_descr *descr)
+void debug_object_deactivate(void *addr, const struct debug_obj_descr *descr)
{
struct debug_bucket *db;
struct debug_obj *obj;
@@ -747,7 +767,7 @@ EXPORT_SYMBOL_GPL(debug_object_deactivate);
* @addr: address of the object
* @descr: pointer to an object specific debug description structure
*/
-void debug_object_destroy(void *addr, struct debug_obj_descr *descr)
+void debug_object_destroy(void *addr, const struct debug_obj_descr *descr)
{
enum debug_obj_state state;
struct debug_bucket *db;
@@ -797,7 +817,7 @@ EXPORT_SYMBOL_GPL(debug_object_destroy);
* @addr: address of the object
* @descr: pointer to an object specific debug description structure
*/
-void debug_object_free(void *addr, struct debug_obj_descr *descr)
+void debug_object_free(void *addr, const struct debug_obj_descr *descr)
{
enum debug_obj_state state;
struct debug_bucket *db;
@@ -838,7 +858,7 @@ EXPORT_SYMBOL_GPL(debug_object_free);
* @addr: address of the object
* @descr: pointer to an object specific debug description structure
*/
-void debug_object_assert_init(void *addr, struct debug_obj_descr *descr)
+void debug_object_assert_init(void *addr, const struct debug_obj_descr *descr)
{
struct debug_bucket *db;
struct debug_obj *obj;
@@ -886,7 +906,7 @@ EXPORT_SYMBOL_GPL(debug_object_assert_init);
* @next: state to move to if expected state is found
*/
void
-debug_object_active_state(void *addr, struct debug_obj_descr *descr,
+debug_object_active_state(void *addr, const struct debug_obj_descr *descr,
unsigned int expect, unsigned int next)
{
struct debug_bucket *db;
@@ -934,7 +954,7 @@ EXPORT_SYMBOL_GPL(debug_object_active_state);
static void __debug_check_no_obj_freed(const void *address, unsigned long size)
{
unsigned long flags, oaddr, saddr, eaddr, paddr, chunks;
- struct debug_obj_descr *descr;
+ const struct debug_obj_descr *descr;
enum debug_obj_state state;
struct debug_bucket *db;
struct hlist_node *tmp;
@@ -1052,7 +1072,7 @@ struct self_test {
unsigned long dummy2[3];
};
-static __initdata struct debug_obj_descr descr_type_test;
+static __initconst const struct debug_obj_descr descr_type_test;
static bool __init is_static_object(void *addr)
{
@@ -1177,7 +1197,7 @@ check_results(void *addr, enum debug_obj_state state, int
fixups, int warnings)
return res;
}
-static __initdata struct debug_obj_descr descr_type_test = {
+static __initconst const struct debug_obj_descr descr_type_test = {
.name = "selftest",
.is_static_object = is_static_object,
.fixup_init = fixup_init,
@@ -1367,6 +1387,11 @@ void __init debug_objects_mem_init(void)
} else
debug_objects_selftest();
+#ifdef CONFIG_HOTPLUG_CPU
+ cpuhp_setup_state_nocalls(CPUHP_DEBUG_OBJ_DEAD, "object:offline", NULL,
+ object_cpu_offline);
+#endif
+
/*
* Increase the thresholds for allocating and freeing objects
* according to the number of possible CPUs available in the system.
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index a2345de90e93..f61689a96e85 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -17,7 +17,7 @@ static DEFINE_SPINLOCK(percpu_counters_lock);
#ifdef CONFIG_DEBUG_OBJECTS_PERCPU_COUNTER
-static struct debug_obj_descr percpu_counter_debug_descr;
+static const struct debug_obj_descr percpu_counter_debug_descr;
static bool percpu_counter_fixup_free(void *addr, enum debug_obj_state state)
{
@@ -33,7 +33,7 @@ static bool percpu_counter_fixup_free(void *addr, enum
debug_obj_state state)
}
}
-static struct debug_obj_descr percpu_counter_debug_descr = {
+static const struct debug_obj_descr percpu_counter_debug_descr = {
.name = "percpu_counter",
.fixup_free = percpu_counter_fixup_free,
};
