linux-kernel - Re: DTB build failure due to preproccessing

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Date:	Fri, 31 May 2013 17:31:39 +0100
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	Ian Campbell <Ian.Campbell@...rix.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Michal Marek <mmarek@...e.cz>,
	Stephen Warren <swarren@...dia.com>,
	Rob Herring <rob.herring@...xeda.com>,
	JonLoeliger <jdl@....com>, linux-kbuild@...r.kernel.org
Subject: Re: DTB build failure due to preproccessing

On Fri, May 31, 2013 at 5:04 PM, Stephen Warren <swarren@...dotorg.org> wrote:
> On 05/31/2013 05:48 AM, Grant Likely wrote:
>> On Fri, 31 May 2013 11:29:30 +0100, Ian Campbell <Ian.Campbell@...rix.com> wrote:
>>> This affects arch/powerpc/boot/dts/virtex440-ml510.dts but I think it is
>>> actually a more general issue:
>>>
>>>         $ make ARCH=powerpc CROSS_COMPILE=powerpc-linux- virtex440-ml510.dtb
>>>           CC      scripts/mod/devicetable-offsets.s
>>>           GEN     scripts/mod/devicetable-offsets.h
>>>           HOSTCC  scripts/mod/file2alias.o
>>>           HOSTLD  scripts/mod/modpost
>>>           DTC     arch/powerpc/boot/virtex440-ml510.dtb
>>>         Error: arch/powerpc/boot/dts/virtex440-ml510.dts:374.6-7 syntax error
>>>         FATAL ERROR: Unable to parse input tree
>>>         make[1]: *** [arch/powerpc/boot/virtex440-ml510.dtb] Error 1
>>>         make: *** [virtex440-ml510.dtb] Error 2
>>>
>>> Line 374 is the "IDSEL 0x16..." line here:
>>>                      interrupt-map = <
>>>                              /* IRQ mapping for pci slots and ALI M1533
>>>                               ...
>>>                               * management core also isn't used.
>>>                               */
>>>
>>>                              /* IDSEL 0x16 / dev=6, bus=0 / PCI slot 3 */
>>>                              0x3000 0 0 1 &xps_intc_0 3 2
>>>                              0x3000 0 0 2 &xps_intc_0 2 2
>>>                              0x3000 0 0 3 &xps_intc_0 5 2
>>>                              0x3000 0 0 4 &xps_intc_0 4 2
>>>
>>> Which gets preprocessed into:
>>>            interrupt-map = <
>>>         # 375 "arch/powerpc/boot/dts/virtex440-ml510.dts"
>>>             0x3000 0 0 1 &xps_intc_0 3 2
>>>             0x3000 0 0 2 &xps_intc_0 2 2
>>>             0x3000 0 0 3 &xps_intc_0 5 2
>>>             0x3000 0 0 4 &xps_intc_0 4 2
>>>
>>> If I manually remove the "# 375 " line then that fixes the error
>>> (although there is then a subsequent one of the same type).
>>>
>>> I suppose this is a bug in dtc? It appears to have at least some
>>> awareness of these preprocessor line number comments since it manages to
>>> report the original source line number.
>>
>> dtc is only able to track line numbers when the native /include/
>> directive is used. The #include directive doesn't help it. It should be
>> added, but until it is the following patch solves the problem:
>>
>> I've got this patch in my tree. Either Rob or I will push it to Linus in
>> the next few days.
>>
>> g.
>>
>> ---
>> commit d01dccdcb3ea8233b09efb9c24db9f057fbd3b37
>> Author: Grant Likely <grant.likely@...aro.org>
>> Date:   Fri May 31 12:45:18 2013 +0100
>>
>>     dtc: Suppress cpp linemarker annotations
>>
>>     DTC isn't able to parse cpp linemarker annotations, so suppress them in
>>     the cpp output by adding the -P flag to the cpp options.
>
> That's not true; it explicitly does have code to parse the line markers.
> I'll have to investigate why it isn't working in this case.
>
> If you apply this patch, then anyone who has switched to #include rther
> than /include/ will get incorrect line numbers in dtc error messages.
> Admittedly that's a smaller population right now though. Perhaps we
> should just do a kernel-wide conversion though.

My mistake. I tested the wrong thing. I've dropped the patch.

g.
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