linux-kernel - Re: [PATCH] trace: events: fix error directive in argument list

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Date:   Mon, 25 Mar 2019 16:11:14 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Hariprasad Kelam <hariprasad.kelam@...il.com>
Cc:     mingo@...hat.com, roopa@...ulusnetworks.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] trace: events: fix  error directive in argument list

On Tue, 26 Mar 2019 01:23:03 +0530
Hariprasad Kelam <hariprasad.kelam@...il.com> wrote:


> ---
>  include/trace/events/neigh.h | 19 +++++--------------
>  1 file changed, 5 insertions(+), 14 deletions(-)
> 
> diff --git a/include/trace/events/neigh.h b/include/trace/events/neigh.h
> index 0bdb085..6e310ea 100644
> --- a/include/trace/events/neigh.h
> +++ b/include/trace/events/neigh.h
> @@ -70,15 +70,11 @@ TRACE_EVENT(neigh_update,
>  		else
>  			*p32 = 0;
>  
> -#if IS_ENABLED(CONFIG_IPV6)
> -		if (n->tbl->family == AF_INET6) {
> -			pin6 = (struct in6_addr *)__entry->primary_key6;
> +		if (IS_ENABLED(CONFIG_IPV6) && n->tbl->family == AF_INET6)
>  			*pin6 = *(struct in6_addr *)n->primary_key;
> -		} else
> -#endif
> -		{
> +		else
>  			ipv6_addr_set_v4mapped(*p32, pin6);
> -		}
> +
>  		__entry->confirmed = n->confirmed;
>  		__entry->updated = n->updated;
>  		__entry->used = n->used;

Not sure why the added pin6 assignment was there to begin with:

<code-snippet>
                pin6 = (struct in6_addr *)__entry->primary_key6;
                p32 = (__be32 *)__entry->primary_key4;

                if (n->tbl->family == AF_INET)
                        *p32 = *(__be32 *)n->primary_key;
                else
                        *p32 = 0;

#if IS_ENABLED(CONFIG_IPV6)
                if (n->tbl->family == AF_INET6) {
                        pin6 = (struct in6_addr *)__entry->primary_key6;
                        *pin6 = *(struct in6_addr *)n->primary_key;
                } else
#endif
                {
                        ipv6_addr_set_v4mapped(*p32, pin6);
                }
</code-snippet>

It was already assigned. Looks fine to me, at least from a tracing
point of view.

-- Steve