Commit 53da59aa authored by Mathieu Desnoyers's avatar Mathieu Desnoyers Committed by Steven Rostedt

tracepoints: Add check trace callback type

This check is meant to be used by tracepoint users which do a direct cast of
callbacks to (void *) for direct registration, thus bypassing the
register_trace_##name and unregister_trace_##name checks.

This permits to ensure that the callback type matches the function type at the
call site, but without generating any code.
Acked-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
Acked-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@efficios.com>
LKML-Reference: <20100430165959.GA25605@Krystal>
CC: Ingo Molnar <mingo@elte.hu>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Peter Zijlstra <peterz@infradead.org>
CC: Arnaldo Carvalho de Melo <acme@redhat.com>
CC: Lai Jiangshan <laijs@cn.fujitsu.com>
CC: Li Zefan <lizf@cn.fujitsu.com>
CC: Christoph Hellwig <hch@lst.de>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 8f082018
...@@ -137,9 +137,11 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin, ...@@ -137,9 +137,11 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
static inline int unregister_trace_##name(void (*probe)(proto)) \ static inline int unregister_trace_##name(void (*probe)(proto)) \
{ \ { \
return tracepoint_probe_unregister(#name, (void *)probe);\ return tracepoint_probe_unregister(#name, (void *)probe);\
} \
static inline void check_trace_callback_type_##name(void (*cb)(proto)) \
{ \
} }
#define DEFINE_TRACE_FN(name, reg, unreg) \ #define DEFINE_TRACE_FN(name, reg, unreg) \
static const char __tpstrtab_##name[] \ static const char __tpstrtab_##name[] \
__attribute__((section("__tracepoints_strings"))) = #name; \ __attribute__((section("__tracepoints_strings"))) = #name; \
...@@ -168,6 +170,9 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin, ...@@ -168,6 +170,9 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
static inline int unregister_trace_##name(void (*probe)(proto)) \ static inline int unregister_trace_##name(void (*probe)(proto)) \
{ \ { \
return -ENOSYS; \ return -ENOSYS; \
} \
static inline void check_trace_callback_type_##name(void (*cb)(proto)) \
{ \
} }
#define DEFINE_TRACE_FN(name, reg, unreg) #define DEFINE_TRACE_FN(name, reg, unreg)
......
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