linux-kernel - Re: [PATCH v2] ftrace: change the export format of trace_kfree

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Date:	Thu, 18 Jun 2009 20:33:31 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH v2] ftrace: change the export format of
 trace_kfree_skb()


On Thu, 18 Jun 2009, Xiao Guangrong wrote:

> Use %pf instead of %p to output the function's address and print the
> protocol's name.
> 
> Before patch:
> 
>   <idle>-0     [000] 60144.542521: kfree_skb: skbaddr=de7b8240 protocol=2048 location=c1365429
>   <idle>-0     [000] 60164.488153: kfree_skb: skbaddr=da66f900 protocol=2048 location=c1365429
>   <idle>-0     [000] 60193.493933: kfree_skb: skbaddr=deaeb480 protocol=4 location=c134ec25
>   <idle>-0     [000] 60253.118421: kfree_skb: skbaddr=de7c4900 protocol=4 location=c134ec25
>           
> After patch:
> 
>   <idle>-0     [000]   169.979205: kfree_skb: skbaddr=ceddc240 protocol=ETH_P_802_2 location=netif_receive_skb
>   <idle>-0     [000]   172.587000: kfree_skb: skbaddr=ceddc300 protocol=ETH_P_802_2 location=netif_receive_skb
>     ping-3391  [000]   192.109803: kfree_skb: skbaddr=ceddc900 protocol=ETH_P_IP location=icmp_rcv
>     ping-3391  [000]   192.109902: kfree_skb: skbaddr=ceddc780 protocol=ETH_P_IP location=icmp_rcv
> 
> Changelog v1->v2:
> Convert protocol from raw numeric to its name as Frederic's suggestion
> 
> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> Acked-by: Frederic Weisbecker <fweisbec@...il.com>

I get this:

  CC      net/core/net-traces.o
In file included from include/trace/ftrace.h:262,
                 from include/trace/define_trace.h:57,
                 from include/trace/events/skb.h:107,
                 from net/core/net-traces.c:28:
include/trace/events/skb.h: In function 'ftrace_raw_output_kfree_skb':
include/trace/events/skb.h:78: error: 'ETH_P_IEEE802154' undeclared (first 
use in this function)
include/trace/events/skb.h:78: error: (Each undeclared identifier is 
reported only once
include/trace/events/skb.h:78: error: for each function it appears in.)

-- Steve
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