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-rw-r--r--arch/powerpc/include/asm/trace.h4
-rw-r--r--arch/powerpc/platforms/powernv/opal-tracepoints.c6
-rw-r--r--arch/powerpc/platforms/pseries/lpar.c6
-rw-r--r--arch/x86/include/asm/trace/exceptions.h2
-rw-r--r--arch/x86/include/asm/trace/irq_vectors.h2
-rw-r--r--arch/x86/kernel/tracepoint.c3
-rw-r--r--drivers/i2c/i2c-core.c3
-rw-r--r--include/linux/tracepoint-defs.h2
-rw-r--r--include/linux/tracepoint.h2
-rw-r--r--include/trace/events/i2c.h2
-rw-r--r--kernel/trace/trace_benchmark.c3
-rw-r--r--kernel/trace/trace_benchmark.h2
-rw-r--r--kernel/tracepoint.c12
-rw-r--r--samples/trace_events/trace-events-sample.c3
-rw-r--r--samples/trace_events/trace-events-sample.h2
15 files changed, 34 insertions, 20 deletions
diff --git a/arch/powerpc/include/asm/trace.h b/arch/powerpc/include/asm/trace.h
index 32e36b16773f..c05cef6ee06c 100644
--- a/arch/powerpc/include/asm/trace.h
+++ b/arch/powerpc/include/asm/trace.h
@@ -54,7 +54,7 @@ DEFINE_EVENT(ppc64_interrupt_class, timer_interrupt_exit,
);
#ifdef CONFIG_PPC_PSERIES
-extern void hcall_tracepoint_regfunc(void);
+extern int hcall_tracepoint_regfunc(void);
extern void hcall_tracepoint_unregfunc(void);
TRACE_EVENT_FN_COND(hcall_entry,
@@ -104,7 +104,7 @@ TRACE_EVENT_FN_COND(hcall_exit,
#endif
#ifdef CONFIG_PPC_POWERNV
-extern void opal_tracepoint_regfunc(void);
+extern int opal_tracepoint_regfunc(void);
extern void opal_tracepoint_unregfunc(void);
TRACE_EVENT_FN(opal_entry,
diff --git a/arch/powerpc/platforms/powernv/opal-tracepoints.c b/arch/powerpc/platforms/powernv/opal-tracepoints.c
index 1e496b780efd..3c447002edff 100644
--- a/arch/powerpc/platforms/powernv/opal-tracepoints.c
+++ b/arch/powerpc/platforms/powernv/opal-tracepoints.c
@@ -6,9 +6,10 @@
#ifdef HAVE_JUMP_LABEL
struct static_key opal_tracepoint_key = STATIC_KEY_INIT;
-void opal_tracepoint_regfunc(void)
+int opal_tracepoint_regfunc(void)
{
static_key_slow_inc(&opal_tracepoint_key);
+ return 0;
}
void opal_tracepoint_unregfunc(void)
@@ -25,9 +26,10 @@ void opal_tracepoint_unregfunc(void)
/* NB: reg/unreg are called while guarded with the tracepoints_mutex */
extern long opal_tracepoint_refcount;
-void opal_tracepoint_regfunc(void)
+int opal_tracepoint_regfunc(void)
{
opal_tracepoint_refcount++;
+ return 0;
}
void opal_tracepoint_unregfunc(void)
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index aa35245d8d6d..c0423ce3955c 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -661,9 +661,10 @@ EXPORT_SYMBOL(arch_free_page);
#ifdef HAVE_JUMP_LABEL
struct static_key hcall_tracepoint_key = STATIC_KEY_INIT;
-void hcall_tracepoint_regfunc(void)
+int hcall_tracepoint_regfunc(void)
{
static_key_slow_inc(&hcall_tracepoint_key);
+ return 0;
}
void hcall_tracepoint_unregfunc(void)
@@ -680,9 +681,10 @@ void hcall_tracepoint_unregfunc(void)
/* NB: reg/unreg are called while guarded with the tracepoints_mutex */
extern long hcall_tracepoint_refcount;
-void hcall_tracepoint_regfunc(void)
+int hcall_tracepoint_regfunc(void)
{
hcall_tracepoint_refcount++;
+ return 0;
}
void hcall_tracepoint_unregfunc(void)
diff --git a/arch/x86/include/asm/trace/exceptions.h b/arch/x86/include/asm/trace/exceptions.h
index 2fbc66c7885b..2422b14c50a7 100644
--- a/arch/x86/include/asm/trace/exceptions.h
+++ b/arch/x86/include/asm/trace/exceptions.h
@@ -6,7 +6,7 @@
#include <linux/tracepoint.h>
-extern void trace_irq_vector_regfunc(void);
+extern int trace_irq_vector_regfunc(void);
extern void trace_irq_vector_unregfunc(void);
DECLARE_EVENT_CLASS(x86_exceptions,
diff --git a/arch/x86/include/asm/trace/irq_vectors.h b/arch/x86/include/asm/trace/irq_vectors.h
index 38a09a13a9bc..32dd6a9e343c 100644
--- a/arch/x86/include/asm/trace/irq_vectors.h
+++ b/arch/x86/include/asm/trace/irq_vectors.h
@@ -6,7 +6,7 @@
#include <linux/tracepoint.h>
-extern void trace_irq_vector_regfunc(void);
+extern int trace_irq_vector_regfunc(void);
extern void trace_irq_vector_unregfunc(void);
DECLARE_EVENT_CLASS(x86_irq_vector,
diff --git a/arch/x86/kernel/tracepoint.c b/arch/x86/kernel/tracepoint.c
index 1c113db9ed57..15515132bf0d 100644
--- a/arch/x86/kernel/tracepoint.c
+++ b/arch/x86/kernel/tracepoint.c
@@ -34,7 +34,7 @@ static void switch_idt(void *arg)
local_irq_restore(flags);
}
-void trace_irq_vector_regfunc(void)
+int trace_irq_vector_regfunc(void)
{
mutex_lock(&irq_vector_mutex);
if (!trace_irq_vector_refcount) {
@@ -44,6 +44,7 @@ void trace_irq_vector_regfunc(void)
}
trace_irq_vector_refcount++;
mutex_unlock(&irq_vector_mutex);
+ return 0;
}
void trace_irq_vector_unregfunc(void)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index b432b64e307a..6a2b995d7fc4 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -77,9 +77,10 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver);
static struct static_key i2c_trace_msg = STATIC_KEY_INIT_FALSE;
static bool is_registered;
-void i2c_transfer_trace_reg(void)
+int i2c_transfer_trace_reg(void)
{
static_key_slow_inc(&i2c_trace_msg);
+ return 0;
}
void i2c_transfer_trace_unreg(void)
diff --git a/include/linux/tracepoint-defs.h b/include/linux/tracepoint-defs.h
index 4ac89acb6136..a03192052066 100644
--- a/include/linux/tracepoint-defs.h
+++ b/include/linux/tracepoint-defs.h
@@ -29,7 +29,7 @@ struct tracepoint_func {
struct tracepoint {
const char *name; /* Tracepoint name */
struct static_key key;
- void (*regfunc)(void);
+ int (*regfunc)(void);
void (*unregfunc)(void);
struct tracepoint_func __rcu *funcs;
};
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index be586c632a0c..f72fcfe0e66a 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -81,7 +81,7 @@ static inline void tracepoint_synchronize_unregister(void)
}
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
-extern void syscall_regfunc(void);
+extern int syscall_regfunc(void);
extern void syscall_unregfunc(void);
#endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */
diff --git a/include/trace/events/i2c.h b/include/trace/events/i2c.h
index fe17187df65d..4abb8eab34d3 100644
--- a/include/trace/events/i2c.h
+++ b/include/trace/events/i2c.h
@@ -20,7 +20,7 @@
/*
* drivers/i2c/i2c-core.c
*/
-extern void i2c_transfer_trace_reg(void);
+extern int i2c_transfer_trace_reg(void);
extern void i2c_transfer_trace_unreg(void);
/*
diff --git a/kernel/trace/trace_benchmark.c b/kernel/trace/trace_benchmark.c
index 0f109c4130d3..f76d0416dd83 100644
--- a/kernel/trace/trace_benchmark.c
+++ b/kernel/trace/trace_benchmark.c
@@ -164,11 +164,12 @@ static int benchmark_event_kthread(void *arg)
* When the benchmark tracepoint is enabled, it calls this
* function and the thread that calls the tracepoint is created.
*/
-void trace_benchmark_reg(void)
+int trace_benchmark_reg(void)
{
bm_event_thread = kthread_run(benchmark_event_kthread,
NULL, "event_benchmark");
WARN_ON(!bm_event_thread);
+ return 0;
}
/*
diff --git a/kernel/trace/trace_benchmark.h b/kernel/trace/trace_benchmark.h
index 3c1df1df4e29..ebdbfc2f2a64 100644
--- a/kernel/trace/trace_benchmark.h
+++ b/kernel/trace/trace_benchmark.h
@@ -6,7 +6,7 @@
#include <linux/tracepoint.h>
-extern void trace_benchmark_reg(void);
+extern int trace_benchmark_reg(void);
extern void trace_benchmark_unreg(void);
#define BENCHMARK_EVENT_STRLEN 128
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index d0639d917899..1f9a31f934a4 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -194,9 +194,13 @@ static int tracepoint_add_func(struct tracepoint *tp,
struct tracepoint_func *func, int prio)
{
struct tracepoint_func *old, *tp_funcs;
+ int ret;
- if (tp->regfunc && !static_key_enabled(&tp->key))
- tp->regfunc();
+ if (tp->regfunc && !static_key_enabled(&tp->key)) {
+ ret = tp->regfunc();
+ if (ret < 0)
+ return ret;
+ }
tp_funcs = rcu_dereference_protected(tp->funcs,
lockdep_is_held(&tracepoints_mutex));
@@ -529,7 +533,7 @@ EXPORT_SYMBOL_GPL(for_each_kernel_tracepoint);
/* NB: reg/unreg are called while guarded with the tracepoints_mutex */
static int sys_tracepoint_refcount;
-void syscall_regfunc(void)
+int syscall_regfunc(void)
{
struct task_struct *p, *t;
@@ -541,6 +545,8 @@ void syscall_regfunc(void)
read_unlock(&tasklist_lock);
}
sys_tracepoint_refcount++;
+
+ return 0;
}
void syscall_unregfunc(void)
diff --git a/samples/trace_events/trace-events-sample.c b/samples/trace_events/trace-events-sample.c
index 880a7d1d27d2..30e282d33d4d 100644
--- a/samples/trace_events/trace-events-sample.c
+++ b/samples/trace_events/trace-events-sample.c
@@ -79,7 +79,7 @@ static int simple_thread_fn(void *arg)
static DEFINE_MUTEX(thread_mutex);
-void foo_bar_reg(void)
+int foo_bar_reg(void)
{
pr_info("Starting thread for foo_bar_fn\n");
/*
@@ -90,6 +90,7 @@ void foo_bar_reg(void)
mutex_lock(&thread_mutex);
simple_tsk_fn = kthread_run(simple_thread_fn, NULL, "event-sample-fn");
mutex_unlock(&thread_mutex);
+ return 0;
}
void foo_bar_unreg(void)
diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
index d6b75bb495b3..76a75ab7a608 100644
--- a/samples/trace_events/trace-events-sample.h
+++ b/samples/trace_events/trace-events-sample.h
@@ -354,7 +354,7 @@ TRACE_EVENT_CONDITION(foo_bar_with_cond,
TP_printk("foo %s %d", __get_str(foo), __entry->bar)
);
-void foo_bar_reg(void);
+int foo_bar_reg(void);
void foo_bar_unreg(void);
/*
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.