netdev - Re: [iproute PATCH v2 2/7] Use C99 style initializers everywhere

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Date:	Wed, 22 Jun 2016 11:12:14 +0200
From:	Jakub Sitnicki <jkbs@...hat.com>
To:	Phil Sutter <phil@....cc>
Cc:	Stephen Hemminger <shemming@...cade.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	David Ahern <dsa@...ulusnetworks.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Julien Floret <julien.floret@...nd.com>, netdev@...r.kernel.org
Subject: Re: [iproute PATCH v2 2/7] Use C99 style initializers everywhere

Hi Phil,

On Tue, Jun 21, 2016 at 06:18 PM CEST, Phil Sutter <phil@....cc> wrote:
> This big patch was compiled by vimgrepping for memset calls and changing
> to C99 initializer if applicable. One notable exception is the
> initialization of union bpf_attr in tc/tc_bpf.c: changing it would break
> for older gcc versions (at least <=3.4.6).
>
> Calls to memset for struct rtattr pointer fields for parse_rtattr*()
> were just dropped since they are not needed.
>
> The changes here allowed the compiler to discover some unused variables,
> so get rid of them, too.
>
> Signed-off-by: Phil Sutter <phil@....cc>
> ---

[...]

> diff --git a/bridge/fdb.c b/bridge/fdb.c
> index be849f980a802..a59d6a9c13018 100644
> --- a/bridge/fdb.c
> +++ b/bridge/fdb.c
> @@ -177,16 +177,15 @@ static int fdb_show(int argc, char **argv)
>  		struct nlmsghdr	n;
>  		struct ifinfomsg	ifm;
>  		char			buf[256];
> -	} req;
> +	} req = {
> +		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
> +		.ifm.ifi_family = PF_BRIDGE
> +	};
>  

A comma is allowed after a list of initializers (IOW, after the last
initializer). Having it would make for smaller/cleaner diffs in the
future if new structure members get added and need to be initialized.

Thanks,
Jakub