Commit 8cf868af authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Steven Rostedt
Browse files

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: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 38e11df1

arch/powerpc/include/asm/trace.h

+2 −2
Original line number Diff line number Diff line
@@ -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,

arch/powerpc/platforms/powernv/opal-tracepoints.c

+4 −2
Original line number Diff line number Diff line
@@ -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)

arch/powerpc/platforms/pseries/lpar.c

+4 −2
Original line number Diff line number Diff line
@@ -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)

arch/x86/include/asm/trace/exceptions.h

+1 −1
Original line number Diff line number Diff line
@@ -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,

arch/x86/include/asm/trace/irq_vectors.h

+1 −1
Original line number Diff line number Diff line
@@ -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,

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