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    Subject[PATCH 2/4] ring_buffer: Export for_each_buffer_cpu()
    Date
    In order to make ring_buffer usable to other modules
    for_each_buffer_cpu() needs to be exported.

    Signed-off-by: Richard Weinberger <richard@nod.at>
    Acked-by: Steven Rostedt <rostedt@goodmis.org>
    ---
    include/linux/ring_buffer.h | 5 +++++
    kernel/trace/ring_buffer.c | 7 +++++++
    2 files changed, 12 insertions(+), 0 deletions(-)

    diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
    index 67be037..5c1c29f 100644
    --- a/include/linux/ring_buffer.h
    +++ b/include/linux/ring_buffer.h
    @@ -185,4 +185,9 @@ enum ring_buffer_flags {
    RB_FL_OVERWRITE = 1 << 0,
    };

    +cpumask_var_t *ring_buffer_mask(struct ring_buffer *buffer);
    +
    +#define for_each_buffer_cpu(buffer, cpu) \
    + for_each_cpu(cpu, *(ring_buffer_mask(buffer)))
    +
    #endif /* _LINUX_RING_BUFFER_H */
    diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
    index f5b7b5c..a4117c5 100644
    --- a/kernel/trace/ring_buffer.c
    +++ b/kernel/trace/ring_buffer.c
    @@ -348,6 +348,7 @@ void *ring_buffer_event_data(struct ring_buffer_event *event)
    }
    EXPORT_SYMBOL_GPL(ring_buffer_event_data);

    +#undef for_each_buffer_cpu
    #define for_each_buffer_cpu(buffer, cpu) \
    for_each_cpu(cpu, buffer->cpumask)

    @@ -4139,3 +4140,9 @@ static int rb_cpu_notify(struct notifier_block *self,
    return NOTIFY_OK;
    }
    #endif
    +
    +cpumask_var_t *ring_buffer_mask(struct ring_buffer *buffer)
    +{
    + return &buffer->cpumask;
    +}
    +EXPORT_SYMBOL_GPL(ring_buffer_mask);
    --
    1.7.7.3


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