linux-kernel - Re: [PATCH] drivers/memory/Kconfig: Add CONFIG

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: <CAK8P3a1_8OSqyKsbw+m3ZzLWfPqDK4ynG3WoPTk+K2uJJsiq5A@mail.gmail.com>
Date:   Mon, 23 Jul 2018 11:34:43 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH] drivers/memory/Kconfig: Add CONFIG_OF dependency

On Sun, Jul 22, 2018 at 8:29 AM, Boris Brezillon
<boris.brezillon@...tlin.com> wrote:
> +Arnd, Rob and the DT ML.
>
> On Sat, 21 Jul 2018 14:53:47 -0700
> Randy Dunlap <rdunlap@...radead.org> wrote:
>
>> On 07/21/2018 01:00 PM, Anders Roxell wrote:
>> > JZ4780_NEMC doesn't depend on OF, and if OF isn't enabled we get this
>> > error:
>> > drivers/memory/jz4780-nemc.c: In function ‘jz4780_nemc_num_banks’:
>> > drivers/memory/jz4780-nemc.c:72:10: error: implicit declaration of
>> >  function ‘of_read_number’; did you mean ‘down_read_nested’?
>> >  [-Werror=implicit-function-declaration]
>> >    bank = of_read_number(prop, 1);
>> >           ^~~~~~~~~~~~~~
>> >           down_read_nested
>
> Looks like of.h defines stubs so that people can compile-test without
> CONFIG_OF selected. Maybe we should move of_read_number() and
> of_read_ulong() out of the #ifdef CONFIG_OF section.

That seems fine, though the added dependency seems appropriate
here as well. of_read_number() is rarely used, and for the most part in
powerpc specific code that is guaranteed to have CONFIG_OF enabled,
so it's not that likely to cause many more problems.

> Alternatively, we could patch jz4780-nemc.c to not use of_read_number
> and instead rely on of_read_property_u32_index() +
> of_property_count_elems_of_size() + of_n_{addr,size}_cells():

That seems noticeably longer for no good reason, I'd go with either
the header file change you suggested or Anders' patch.

       Arnd