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SubjectRe: [RFC patch 2/5] trace event skb fix unassigned field
On Tue, Jan 04, 2011 at 06:46:06PM -0500, nhorman@tuxdriver.com wrote:
> Acked- by: Neil Horman <nhorman@tuxdriver.com>
>
>
> Sent from my Verizon Wireless Phone
>
> ----- Reply message -----
> From: "Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>
> Date: Tue, Jan 4, 2011 6:16 pm
> Subject: [RFC patch 2/5] trace event skb fix unassigned field
> To: "LKML" <linux-kernel@vger.kernel.org>
> Cc: "Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>, "Steven Rostedt" <rostedt@goodmis.org>, "Frederic Weisbecker" <fweisbec@gmail.com>, "Ingo Molnar" <mingo@elte.hu>, "Neil Horman" <nhorman@tuxdriver.com>, "Thomas Gleixner" <tglx@linutronix.de>
>
>
> The field "protocol" in event kfree_skb is left unassigned if skb is NULL,
> leaving its trace output as garbage. Assign the value to 0 when skb is NULL
> instead.

Hm, if the skb is already null, we probably shouldn't send any trace.

What about using TP_CONDITION() ?

>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> CC: Steven Rostedt <rostedt@goodmis.org>
> CC: Frederic Weisbecker <fweisbec@gmail.com>
> CC: Ingo Molnar <mingo@elte.hu>
> CC: Neil Horman <nhorman@tuxdriver.com>
> CC: Thomas Gleixner <tglx@linutronix.de>
> ---
> include/trace/events/skb.h | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> Index: linux-2.6-lttng/include/trace/events/skb.h
> ===================================================================
> --- linux-2.6-lttng.orig/include/trace/events/skb.h
> +++ linux-2.6-lttng/include/trace/events/skb.h
> @@ -25,9 +25,7 @@ TRACE_EVENT(kfree_skb,
>
> TP_fast_assign(
> __entry->skbaddr = skb;
> - if (skb) {
> - __entry->protocol = ntohs(skb->protocol);
> - }
> + __entry->protocol = skb ? ntohs(skb->protocol) : 0;
> __entry->location = location;
> ),
>
>
>


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