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

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Message-ID: <20190327115330.04b5b481@gandalf.local.home>
Date:   Wed, 27 Mar 2019 11:53:30 -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:

> 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
> 

I have nothing really against these patches, but why is the current
code considered wrong?

Note, TRACE_EVENTS() are "special macros". They hold structure
definitions and full code inside the argument list. There should be no
reason that this is causing a warning.

Perhaps we should blacklist the include/trace directory from sparse
checking for these types of "errors".

-- Steve


> 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;
> -		} else
> -#endif
> -		{
> +		else
>  			ipv6_addr_set_v4mapped(*p32, pin6);
> -		}
> +
>  		__entry->confirmed = n->confirmed;
>  		__entry->updated = n->updated;
>  		__entry->used = n->used;
> @@ -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;
> +		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;