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

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Date:   Sat, 30 Mar 2019 16:37:48 +0530
From:   Hariprasad Kelam <hariprasad.kelam@...il.com>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>, mingo@...hat.com,
        roopa@...ulusnetworks.com, davem@...emloft.net,
        linux-kernel@...r.kernel.org, linux-sparse@...r.kernel.org
Subject: Re: [PATCH] trace: events: fix  error directive in argument list

On Sat, Mar 30, 2019 at 12:22:17AM +0100, Luc Van Oostenryck wrote:
> On Tue, Mar 26, 2019 at 01:23:03AM +0530, Hariprasad Kelam wrote:
> > This patch fixes below spare errors.
> > 
> > Sparse error:
> > make C=2 CF=-D__CHECK_ENDIAN__ M=net/core
> > ./include/trace/events/neigh.h:73:1: error: directive in argument list
> > ./include/trace/events/neigh.h:78:1: error: directive in argument list
> > ./include/trace/events/neigh.h:150:1: error: directive in argument list
> > ./include/trace/events/neigh.h:155:1: error: directive in argument list
> > 
> > Changes below two lines to signle line to avoid sparse error
> >  #if IS_ENABLED(CONFIG_IPV6)
> >                if (n->tbl->family == AF_INET6) {
> > to if (IS_ENABLED(CONFIG_IPV6) && n->tbl->family == AF_INET6)
> > 
> > and removes reassigning pin6 pointer when IPV6 is enabled
> > 
> > Signed-off-by: Hariprasad Kelam <hariprasad.kelam@...il.com>
> > ---
> >  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;
> 
> Why removing the line wheer pin6 is assigned?
> IMO, the patch should be:
> -#if IS_ENABLED(CONFIG_IPV6)
> -		if (n->tbl->family == AF_INET6) {
> +		if (IS_ENABLED(CONFIG_IPV6) && n->tbl->family == AF_INET6)
>  			pin6 = (struct in6_addr *)__entry->primary_key6;
>   			*pin6 = *(struct in6_addr *)n->primary_key;
> 
> > @@ -147,15 +143,10 @@ DECLARE_EVENT_CLASS(neigh__update,
> >  		else
> >  			*p32 = 0;
> >  
> > -#if IS_ENABLED(CONFIG_IPV6)
> > -		if (n->tbl->family == AF_INET6) {
> > -			pin6 = (struct in6_addr *)__entry->primary_key6;
>
pin6  is already assinged .Assinging pin6 is redudant in if loop
 Below is the original code
 <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>


> Same here.
> 
> -- Luc Van Oostenryck