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    Subject[PATCH v4 2/5] napi: convert trace_napi_poll to TRACE_EVENT
    From: Neil Horman <nhorman@tuxdriver.com>

    This patch converts trace_napi_poll from DECLARE_EVENT to TRACE_EVENT to improve
    the usability of napi_poll tracepoint.

    <idle>-0 [001] 241302.750777: napi_poll: napi poll on napi struct f6acc480 for device eth3
    <idle>-0 [000] 241302.852389: napi_poll: napi poll on napi struct f5d0d70c for device eth1

    An original patch is below.
    http://marc.info/?l=linux-kernel&m=126021713809450&w=2
    Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

    And add a fix by Steven Rostedt.
    http://marc.info/?l=linux-kernel&m=126150506519173&w=2

    Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com>
    ---
    include/trace/events/napi.h | 25 +++++++++++++++++++++++--
    1 files changed, 23 insertions(+), 2 deletions(-)

    diff --git a/include/trace/events/napi.h b/include/trace/events/napi.h
    index 188deca..8fe1e93 100644
    --- a/include/trace/events/napi.h
    +++ b/include/trace/events/napi.h
    @@ -6,10 +6,31 @@

    #include <linux/netdevice.h>
    #include <linux/tracepoint.h>
    +#include <linux/ftrace.h>
    +
    +#define NO_DEV "(no_device)"
    +
    +TRACE_EVENT(napi_poll,

    -DECLARE_TRACE(napi_poll,
    TP_PROTO(struct napi_struct *napi),
    - TP_ARGS(napi));
    +
    + TP_ARGS(napi),
    +
    + TP_STRUCT__entry(
    + __field( struct napi_struct *, napi)
    + __string( dev_name, napi->dev ? napi->dev->name : NO_DEV)
    + ),
    +
    + TP_fast_assign(
    + __entry->napi = napi;
    + __assign_str(dev_name, napi->dev ? napi->dev->name : NO_DEV);
    + ),
    +
    + TP_printk("napi poll on napi struct %p for device %s",
    + __entry->napi, __get_str(dev_name))
    +);
    +
    +#undef NO_DEV

    #endif /* _TRACE_NAPI_H_ */



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