linux-kernel - Re: [PATCH 4/4] ARM: remove duplicate const qualifier

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Message-ID: <alpine.LFD.2.20.1604250953200.5091@knanqh.ubzr>
Date:	Mon, 25 Apr 2016 10:12:16 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Eric Engestrom <eric.engestrom@...tec.com>
cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Tony Lindgren <tony@...mide.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Lee Jones <lee.jones@...aro.org>,
	Roland Stigge <stigge@...com.de>,
	Florian Fainelli <f.fainelli@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Alexander Shiyan <shc_work@...l.ru>,
	Kevin Hilman <khilman@...nel.org>,
	Viresh Kumar <vireshk@...nel.org>,
	bcm-kernel-feedback-list@...adcom.com,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	spear-devel@...t.st.com, Ray Jui <rjui@...adcom.com>,
	Rajendra Nayak <rnayak@...com>, Sekhar Nori <nsekhar@...com>,
	Krzysztof Halasa <khalasa@...p.pl>,
	Gregory Fong <gregory.0xf0@...il.com>,
	linux-omap@...r.kernel.org, Paul Walmsley <paul@...an.com>,
	Scott Branden <sbranden@...adcom.com>,
	Shiraz Hashim <shiraz.linux.kernel@...il.com>,
	linux-kernel@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH 4/4] ARM: remove duplicate const qualifier

On Mon, 25 Apr 2016, Eric Engestrom wrote:

> On Mon, Apr 25, 2016 at 01:38:18PM +0200, Arnd Bergmann wrote:
> > Maybe say you you found it (llvm, sparse, coccinelle?), and why this
> > is causing a problem for anyone. If it's just unnecessary but not
> > harmful, I'd probably ignore the patch.
> 
> $ grep -rE '(^|\W)const(\s+\w+)+\s+const\s'
> 
> I just happened to notice some unnecessary const in our internal code,
> so I grep'ed for it in a couple big OSS projects to see how common it
> was. Since I found only a few, I decided to remove them, but like I said
> it just gets ignored by all the compilers I know, so there's absolutely
> no harm in leaving this dead code around.

Beware.

I added many of those exactly because gcc did not ignore them when 
compiling with LTO where the lack of a const qualifier to qualify the 
actual array content, and not only the reference to that content, 
generated build errors due to section mismatches from the __initconst 
annotation.

So this is a NAK from me unless you may confirm that LTO builds are 
unaffected by your changes.


Nicolas