linux-kernel - Re: [PATCH] kernel: use the gnu89 standard explicitly

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Message-ID: <20141019232124.GC9319@node.dhcp.inet.fi>
Date:	Mon, 20 Oct 2014 02:21:24 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Aaro Koskinen <aaro.koskinen@....fi>,
	Andrew Pinski <pinskia@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel: use the gnu89 standard explicitly

On Mon, Oct 20, 2014 at 02:10:31AM +0300, Kirill A. Shutemov wrote:
> On Sun, Oct 19, 2014 at 04:05:25PM -0700, Linus Torvalds wrote:
> > On Sun, Oct 19, 2014 at 2:03 PM, Aaro Koskinen <aaro.koskinen@....fi> wrote:
> > >
> > > Here's one example how it fails: http://marc.info/?l=gcc&m=141349914632010&w=2
> > 
> > Ok, that just looks like a gnu11 bug, then. Not being able to
> > initialize structures because some sub-structure has a volatile member
> > is just pure BS.
> > 
> > Has anybody reported this as a gcc bug? That email may be on the gcc
> > list, but I'm not seeing anybody acknowledge it as a bug..
> > 
> > I cannot imagine that anybody sane claims that this is *wanted*
> > behavior from "gnu11".
> 
> IIUC, it's nothing to do with volatile. C11 and above reads

s/C11/C99/

> 
> 	(rwlock_t) { .raw_lock = { 0 }, }
> 
> as compound literal (which is not constant) rather than constant
> initalizer plus a cast.

In some places we can just drop the cast, but it doesn't work everywhere.
I don't see a way to get pre-c99 semantics here.

-- 
 Kirill A. Shutemov
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