linux-kernel - Re: [PATCH] drivers: Let several drivers depends on HAS_IOMEM for 'devm_ioremap

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: <53C291C8.6050303@nod.at>
Date:	Sun, 13 Jul 2014 16:03:52 +0200
From:	Richard Weinberger <richard@....at>
To:	Lars-Peter Clausen <lars@...afoo.de>
CC:	Lennox Wu <lennox.wu@...il.com>, Marek Vasut <marex@...x.de>,
	Chen Gang <gang.chen.5i5j@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dmitry.torokhov@...il.com, thierry.reding@...il.com,
	jic23@...nel.org, wim@...ana.be,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	kys@...rosoft.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	teg@...m.no, Mischa.Jonker@...opsys.com, msalter@...hat.com,
	knaack.h@....de, rdunlap@...radead.org,
	linux-input@...r.kernel.org, linux-pwm@...r.kernel.org,
	linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-watchdog@...r.kernel.org, Liqin Chen <liqin.linux@...il.com>
Subject: Re: [PATCH] drivers: Let several drivers depends on HAS_IOMEM for
 'devm_ioremap_resource'

Am 13.07.2014 15:56, schrieb Lars-Peter Clausen:
> On 07/13/2014 03:40 PM, Richard Weinberger wrote:
>> Am 13.07.2014 15:26, schrieb Lars-Peter Clausen:
>>> On 07/13/2014 11:45 AM, Richard Weinberger wrote:
>>>> Am 13.07.2014 11:27, schrieb Lennox Wu:
>>>>> As I said before, some configurations don't make sense.
>>>>
>>>> If such a configuration can be achieved using allmod/yesconfig it has to be fixed.
>>>> Chen's fixes seem reasonable as not all architectures support iomem.
>>>
>>> Maybe we should stub out ioremap() and friends when COMPILE_TEST is enabled to avoid these linker errors. That's in my opinion better than turning most of the 'depends on
>>> COMPILE_TEST' into 'depends on COMPILE_TEST && HAS_IOMEM'. The issue comes up quite a lot and it is often overlooked when adding a driver that can be build when COMPILE_TEST is
>>> enabled.
>>
>> And what should this stub do?
>> Except calling BUG()...
> 
> return NULL;
> 
> It's for compile testing, it's not meant to work at runtime.

Hm, I really don't like the idea of having a non-working kernel.
IMHO either it should build _and_ run and nothing else.
Greg, what do you think?

Thanks,
//richard
--
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/