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    Subject[PATCH 02/12 v2] tracepoints: Add check trace callback type
    From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

    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.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
    LKML-Reference: <20100430165959.GA25605@Krystal>
    CC: Steven Rostedt <rostedt@goodmis.org>
    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: Frederic Weisbecker <fweisbec@gmail.com>
    CC: Arnaldo Carvalho de Melo <acme@redhat.com>
    CC: Lai Jiangshan <laijs@cn.fujitsu.com>
    CC: Li Zefan <lizf@cn.fujitsu.com>
    CC: Masami Hiramatsu <mhiramat@redhat.com>
    CC: Christoph Hellwig <hch@lst.de>
    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    ---
    include/linux/tracepoint.h | 7 ++++++-
    1 files changed, 6 insertions(+), 1 deletions(-)

    diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
    index 1d85f9a..8d5e4f6 100644
    --- a/include/linux/tracepoint.h
    +++ b/include/linux/tracepoint.h
    @@ -137,9 +137,11 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
    static inline int unregister_trace_##name(void (*probe)(proto)) \
    { \
    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) \
    static const char __tpstrtab_##name[] \
    __attribute__((section("__tracepoints_strings"))) = #name; \
    @@ -168,6 +170,9 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
    static inline int unregister_trace_##name(void (*probe)(proto)) \
    { \
    return -ENOSYS; \
    + } \
    + static inline void check_trace_callback_type_##name(void (*cb)(proto)) \
    + { \
    }

    #define DEFINE_TRACE_FN(name, reg, unreg)
    --
    1.7.0



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