linux-kernel - Re: [PATCH] kconfig/menuconfig: use TAILQ instead of CIRCLEQ

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Date:	Sat, 20 Oct 2012 00:52:53 +0200
From:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
To:	linux-kbuild@...r.kernel.org
Cc:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	linux-kernel@...r.kernel.org, mmarek@...e.cz, bpoirier@...e.de,
	yselkowitz@...il.com
Subject: Re: [PATCH] kconfig/menuconfig: use TAILQ instead of CIRCLEQ

Tetsuo, Michal, All,

On Friday 19 October 2012 Tetsuo Handa wrote:
> Yann E. MORIN wrote:
> > Some systems (eg. Cygwin, FreeBSD) are missing the CIRCLEQ macros.
[--SNIP--]
> > So, switch to using TAILQ instead, which are more portable.
[--SNIP--]
> Excuse me, but your patch does not solve my problem because kconfig started
> using macros which does not exist in "@(#)queue.h 8.3 (Berkeley) 12/13/93".

Whoa. That's old... :-/

Currently, kconfig uses (CIRCLEQ or TAILQ)

> Kconfig still fails after applying your patch:
[--SNIP--]
> So, would you add something which looks like "sed -e 's/CIRCLEQ/TAILQ/g'" upon
> https://lkml.org/lkml/2012/10/16/274 ?

Sorry, I did not see you had posted a patch.

Basically, I don't care what solution we choose. Using TAILQ looks like
being not the solution. So, here are the known options:
1-  Michal pointed to tools/firewire/list.h, but those are different from
    the CIRCLEQ/TAILQ, and switching is not easy (at least for me after a
    quick glance);

1b- note also that drivers/scsi/aic7xxx/queue.h has all of both the CIRCLEQ
    and TAILQ macros we're interested in, too, and it looks like it can be
    used out of the kernel (eg. for userland);

2-  carry the parts of CIRCLEQ (or TAILQ) that we need, and use them if
    the system's sys/queue.h does not provide them, as Tetsuo proposed;

3-  carry the parts of CIRCLEQ (or TAILQ) that we need, and do not rely
    on the system's sys/queue.h to provide them at all.


Michal, what do you think would be the best route to go, to:
1- get a fix in 3.7 ?
2- if the fix for 3.7 is just a workaround, a proper fix for 3.8 ?

Regards,
Yann E. MORIN.

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