linux-kernel - Re: [PATCH 1/5] ptp: Added a brand new class driver for ptp clocks.

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <201008191748.51819.arnd@arndb.de>
Date:	Thu, 19 Aug 2010 17:48:51 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	Richard Cochran <richardcochran@...il.com>,
	Rodolfo Giometti <giometti@...ux.it>,
	john stultz <johnstul@...ibm.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	Krzysztof Halasa <khc@...waw.pl>
Subject: Re: [PATCH 1/5] ptp: Added a brand new class driver for ptp clocks.

On Thursday 19 August 2010, Ira W. Snyder wrote:
> Perhaps you were thinking of the vhost example (taken from
> drivers/vhost/Kconfig):
> 
> config VHOST_NET
>         tristate "Host kernel accelerator for virtio net (EXPERIMENTAL)"
>         depends on NET && EVENTFD && (TUN || !TUN) && (MACVTAP || !MACVTAP) && EXPERIMENTAL
> 
> They have a similar construct with both TUN and MACVTAP there. Perhaps
> the parens are a necessary part of the "X || !X" syntax? Just a random
> guess.

Yes, that's the one I was thinking of.

My mistake was that the effect is slightly different here. VHOST and TUN are
both tristate. What we guarantee here is that if TUN is "m", VHOST cannot be "y",
because its dependency cannot be fulfilled for y.

	Arnd
--
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/