linux-kernel - Re: [PATCH] kernel/irq/devres.c: move "kernel/irq/devres.c" to "drivers/base/devres

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Date:	Wed, 24 Jul 2013 09:59:27 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/irq/devres.c: move "kernel/irq/devres.c" to "drivers/base/devres_irq.c"

On 07/23/2013 11:31 PM, Greg KH wrote:
> On Tue, Jul 23, 2013 at 03:36:04PM +0800, Chen Gang wrote:
>> "kernel/irq/devres.c" is a driver extension tool for irq (with devres)
>> which is independent on 'GENERIC_HARDIRQS', so it is not suitable to
>> still be in "kernel/irq/" which depends on 'GENERIC_HARDIRQS'.
>>
>> It is a basic tool for drivers, so can move it to "drivers/base/" to be
>> independent on 'GENERIC_HARDIRQS'.
>>
>> It is about irq features, so if can not find other more suitable place,
>> can still let their declaration in "include/linux/interrupts.h".
>>
>> The related error (with randconfig which disable 'GENERIC_HARDIRQS')
>>
>>   drivers/built-in.o: In function `dw_dma_probe':
>>   (.text+0x3747a): undefined reference to `devm_request_threaded_irq'
> 
> Don't fix problems when you are moving files around, that makes it
> _very_ hard to review.
> 

OK, thanks, I should notice next time (originally, I really did not know
about it).

Hmm... but for our case, if move the related file, it also can solve the
related issue, it is only one action.

> Remember, one thing per patch please.
> 

OK, thanks, I will try (that may let me make more patches, which is not
bad for myself ;-)).


>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> ---
>>  drivers/base/Makefile     |    2 +-
>>  drivers/base/devres_irq.c |   94 +++++++++++++++++++++++++++++++++++++++++++++
>>  kernel/irq/Makefile       |    2 +-
>>  kernel/irq/devres.c       |   94 ---------------------------------------------
>>  4 files changed, 96 insertions(+), 96 deletions(-)
>>  create mode 100644 drivers/base/devres_irq.c
>>  delete mode 100644 kernel/irq/devres.c
> 
> Please use git when renaming files so that the move is shown in the git
> patch.  As it is, I would have to verify this by hand, and I don't want
> to ever have to do that.
> 

Oh, thanks, I need use git to perform it (I should try to familiar with
git).

> Also, I have no problem with the file being where it is.  This is for
> irqs, which are handled by the interrupt maintainers, no need to put it
> in the driver core, just because it happens to deal with "resources".
> We arrange things for ease of maintainability, not always logically :)
> 

Hmm... normally, 'maintainability' has no conflict with 'logically', if
we feel they are conflict, that means both of them need improvement.

For 'logically', is it suitable to move "resources" from "drivers/base"
to "lib/", since they are already not only for drivers wide, but also
for kernel wide ? (especially, some of "devm*" have already been in "lib/").

For 'maintainability', is it suitable to let "kernel/irq" independent on
'GENERIC_HARDIRQS' or "mv kernel/irq/devres.c kernel/devres_irq.c" ?

:-)

Thanks.
-- 
Chen Gang
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