diff options
| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2016-11-28 13:03:21 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-12-09 09:13:30 -0500 |
| commit | 8cf868affdc459beee1a941df0cfaba1673740e3 (patch) | |
| tree | 64dd73ba504f458831177e091f90f0324962d226 /arch/powerpc | |
| parent | 38e11df134297ea3860c7aad8263ece27db01308 (diff) | |
| download | linux-8cf868affdc459beee1a941df0cfaba1673740e3.tar.bz2 | |
tracing: Have the reg function allow to fail
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>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/trace.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-tracepoints.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/lpar.c | 6 |
3 files changed, 10 insertions, 6 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) |