linux-kernel - Re: [PATCH] UBI: rename free variable

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Message-ID: <56174518.3050906@denx.de>
Date:	Fri, 9 Oct 2015 06:39:52 +0200
From:	Heiko Schocher <hs@...x.de>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Brian Norris <computersforpeace@...il.com>,
	Richard Weinberger <richard@....at>,
	linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>,
	Artem Bityutskiy <dedekind1@...il.com>
Subject: Re: [PATCH] UBI: rename free variable

Hello Al,

Am 09.10.2015 um 06:13 schrieb Al Viro:
> On Fri, Oct 09, 2015 at 05:29:21AM +0200, Heiko Schocher wrote:
>> rename free variable into not "free", as "free" prevents
>> ubi sources compiling under U-Boot. So rename "free"
>> into "pfree" where it is a pointer, and into "freel",
>> where it is a free list.
>
> Huh?  If U-Boot has free defined as an object-like macro, it's an outright bug
> in U-Boot and it should be fixed there.  If it's something else, it looks like
> a toolchain bug.   Details, please...

Sorry, I should have added this info immediately into the patch ...

We have in U-Boot a compat.h file, in which we collect all things
we need to make linux code running under U-Boot, and there we map
kfree() to free(), see:

http://git.denx.de/?p=u-boot.git;a=blob;f=include/linux/compat.h;h=fbebf910addd994d265d21c4fbaa0a2f48f4ccb1;hb=996ec1dcc58a34b53891acde0ec5df9141b5fcc2#l58

So, if we use a var name "free", this will conflict ... and I get
for example when compiling the UBI code:

   CC      drivers/mtd/ubi/fastmap.o
drivers/mtd/ubi/fastmap.c: In function 'scan_pool':
drivers/mtd/ubi/fastmap.c:475:3: error: called object 'free' is not a function

So with this patch, we have less differences to kernel files ...

bye,
Heiko
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