Re: linux-next failure on tegra due to conflicts between PPI andirq domain patches and irq.h->module.h include removal

From: Paul Gortmaker
Date: Wed Oct 26 2011 - 10:28:20 EST

On 11-10-25 06:01 PM, Olof Johansson wrote:
> On Tue, Oct 25, 2011 at 3:00 PM, Rob Herring <robherring2@xxxxxxxxx> wrote:
>> Olof,
>> On 10/25/2011 04:48 PM, Olof Johansson wrote:
>>> Hi,
>>> Looks like Marc added new references to irq_start in his PPI patch,
>>> and Rob removed it in parallel. Also, irq_offset is no longer
>>> available. Looks like you need to respin your patch, Marc.
>>> arch/arm/common/gic.c: In function 'gic_dist_init':
>>> arch/arm/common/gic.c:290: error: 'irq_start' undeclared (first use in
>>> this function)
>>> arch/arm/common/gic.c:290: error: (Each undeclared identifier is
>>> reported only once
>>> arch/arm/common/gic.c:290: error: for each function it appears in.)
>>> arch/arm/common/gic.c:296: error: 'struct gic_chip_data' has no member
>>> named 'irq_offset'
>> I fixed this and sent a pull request yesterday to Arnd.
> Ah, oops, forgot to check for already-posted-patches. :) Excellent.
>>> The second error is because of the change from Paul that removes
>>> module.h from irq.h:
>>> arch/arm/common/gic.c: In function 'gic_init':
>>> arch/arm/common/gic.c:620: error: 'THIS_MODULE' undeclared (first use
>>> in this function)
>>> Looks odd that I should need to include module.h on my own just to use
>>> irq defines. Paul?
>> THIS_MODULE is needed by irq.h itself in irq_alloc_descs, so it probably
>> needs to be added back.
> Well, the new export.h that defines THIS_MODULE probably needs to be
> added to irq.h, yes.

No. The whole point of the commit was to avoid nested includes
as per the commit log:

Also convert the irq_alloc_descs variants to macros, since all
they really do is is call the __irq_alloc_descs primitive.
This avoids including export.h and no debug info is lost.

If your file is relating to modular usage such that it is a modular
provider of interrupt sources and hence uses "THIS_MODULE", then it
will need export.h in the future. And that macro has nothing whatsoever
to do with any irq defines; it is used all over the kernel to tie
structures back to a (possibly modular) code block, just as per the
use case here in irq.h is.


> -Olof
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