linux-kernel - Re: include/linux/kernel.h:860:32: error: dereferencing pointer to incomplete type 'struct clock_event

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Message-ID: <2a392cd7-22b3-f41d-b4e4-7b97bf2f3637@linaro.org>
Date:   Mon, 25 Sep 2017 18:37:57 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Ian Abbott <abbotti@....co.uk>,
        kbuild test robot <fengguang.wu@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: include/linux/kernel.h:860:32: error: dereferencing pointer to
 incomplete type 'struct clock_event_device'

On 25/09/2017 17:15, Ian Abbott wrote:
> [Sorry for the repost.  I forgot to Cc the people I said I was Cc'ing!]

Hi Ian,

[ ... ]


> On 24/09/17 09:26, kbuild test robot wrote:
>> Hi Ian,
>>
>> FYI, the error/warning still remains.
>>
>> tree:  
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   cd4175b11685b11c40e31a03e05084cc212b0649
>> commit: c7acec713d14c6ce8a20154f9dfda258d6bcad3b kernel.h: handle
>> pointers to arrays better in container_of()
>> date:   2 months ago
>> config: ia64-allmodconfig (attached as .config)
>> compiler: ia64-linux-gcc (GCC) 6.2.0
>> reproduce:
>>          wget
>> https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross
>> -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          git checkout c7acec713d14c6ce8a20154f9dfda258d6bcad3b
>>          # save the attached .config to linux build tree
>>          make.cross ARCH=ia64
>>
>> All errors (new ones prefixed by >>):
>>
>>     In file included from drivers/clocksource/timer-of.c:25:0:
>>     drivers/clocksource/timer-of.h:35:28: error: field 'clkevt' has
>> incomplete type
>>       struct clock_event_device clkevt;

[ ... ]

> 
> Cc'ing Daniel Lezcano and Thomas Gleixner, since this seems to be a
> problem with configurations selecting 'TIMER_OF' even though
> 'GENERIC_CLOCKEVENTS' is not selected.
> 
> There was a recent-ish commit 599dc457c79b
> ("clocksource/drivers/Kconfig: Fix CLKSRC_PISTACHIO dependencies") to
> address this problem for one particular clocksource driver, but some
> other clocksource drivers seem to share the same problem.  There are
> several clocksource config options in "drivers/clocksource/Kconfig" that
> select 'TIMER_OF' without depending on 'GENERIC_CLOCKEVENTS'.  Some of
> them are only manually selectable when 'COMPILE_TEST' is selected.  This
> particular failure seems to be at least partly due to 'ARMV7M_SYSTICK'
> getting selected.

Thanks for Cc'ing. This issue is currently in the way to be fixed.

https://patchwork.kernel.org/patch/9939191/

  -- Daniel

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