linux-kernel - Re: [PATCH] dev: use ifindex hash for dev_seq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20111012085024.634281a2@nehalam.linuxnetplumber.net>
Date:	Wed, 12 Oct 2011 08:50:24 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Mihai Maruseac <mihai.maruseac@...il.com>
Cc:	davem@...emloft.net, eric.dumazet@...il.com,
	mirq-linux@...e.qmqm.pl, therbert@...gle.com, jpirko@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dbaluta@...acom.com, Mihai Maruseac <mmaruseac@...acom.com>
Subject: Re: [PATCH] dev: use ifindex hash for dev_seq_ops

On Wed, 12 Oct 2011 12:57:26 +0300
Mihai Maruseac <mihai.maruseac@...il.com> wrote:

It looks like you lost the ability to seek back and read the header
(start token).  How is the header handled, is possible to rewind
the file and read it over again?


> +static inline struct net_device *next_dev(struct seq_file *seq, loff_t *pos)
> +{
> +	struct dev_iter_state *state = seq->private;
> +	struct net *net = seq_file_net(seq);
> +	struct net_device *dev = NULL;
> +	loff_t off;
> +
> +	++*pos;
> +	dev = dev_get_by_index_rcu(net, state->ifindex);

Looks good a couple of minor nits.

1. The function should not be inline, since it is in no way performance
   critical. The compiler will probably inline it anyway.

2. dev does not have to be initialized since it is assigned a few
   lines later.  Most programmers are trained now to always initialize
   variables, but often it is unnecessary.

3. The name next_dev() is a little generic; maybe a better name.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/