xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

tracing: Have the reg function allow to fail

Browse Source 
Some tracepoints have a registration function that gets enabled when the
tracepoint is enabled. There may be cases that the registraction function
must fail (for example, can't allocate enough memory). In this case, the
tracepoint should also fail to register, otherwise the user would not know
why the tracepoint is not working.

Cc: David Howells <dhowells@redhat.com>
Cc: Seiji Aguchi <seiji.aguchi@hds.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat)
2016-11-28 13:03:21 -05:00
committed by Steven Rostedt
parent 38e11df134
commit 8cf868affd
15 changed files with 34 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/include/asm/trace.h
View File

@@ -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,

6
arch/powerpc/platforms/powernv/opal-tracepoints.c
View File

@@ -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)

6
arch/powerpc/platforms/pseries/lpar.c
View File

@@ -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)

2
arch/x86/include/asm/trace/exceptions.h
View File

@@ -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,

2
arch/x86/include/asm/trace/irq_vectors.h
View File

@@ -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,

3
arch/x86/kernel/tracepoint.c
View File

@@ -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)