linux-kernel - Re: [PATCH] mmc: core: remove issue

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Message-ID: <CAPDyKFp8G_F65u_eGam99DTDckzoKx2oct18Jo7zm54U8jY7=Q@mail.gmail.com>
Date:	Fri, 27 Sep 2013 11:04:47 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Grant Grundler <grundler@...omium.org>
Cc:	Chris Ball <cjb@...top.org>, Seungwon Jeon <tgih.jun@...sung.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: core: remove issue_fn indirect function call

On 27 September 2013 00:16, Grant Grundler <grundler@...omium.org> wrote:
> On Thu, Sep 26, 2013 at 2:56 PM, Grant Grundler <grundler@...omium.org> wrote:
>> On Wed, Sep 25, 2013 at 7:37 PM, Chris Ball <cjb@...top.org> wrote:
>>> Hi,
>>>
>>> On Wed, Sep 25 2013, Chris Ball wrote:
>>>> Hi,
>>>>
>>>> On Fri, Sep 20 2013, Ulf Hansson wrote:
>>>>> On 19 September 2013 19:20, Grant Grundler <grundler@...omium.org> wrote:
>>>>>> struct mmc_queue defines issue_fn as an indirect function call.
>>>>>> issue_fn field only gets set to mmc_blk_issue_rq and only gets
>>>>>> invoked immediately after calling blk_fetch_request().
>>>>>> Don't bother with indirect function call - it's pointless and just
>>>>>> obfuscates the code.
>>>>>>
>>>>>> Signed-off-by: Grant Grundler <grundler@...omium.org>
>>>>>
>>>>> Acked-by: Ulf Hansson <ulf.hansson@...aro.org>
>>>>
>>>> Thanks, pushed to mmc-next for 3.13.
>>>
>>> Have dropped this, it's breaking my build:
>>>
>>> /home/cjb/git/mmc/drivers/mmc/card/block.c:1955:12: warning: ‘mmc_blk_issue_rq’ defined but not used [-Wunused-function]
>>
>> The function is declared static. :(  Let me respin to remove the
>> static and add a function prototype to a header file.
>
> block.o and queue.o are linked together into one .ko all the time:
> obj-$(CONFIG_MMC_BLOCK)         += mmc_block.o
> mmc_block-objs                  := block.o queue.o
>
> Two ways to handle this: I can
> 1) add a local function prototype of mmc_blk_issue_rq() to queue.c
> 2) move mmc_init_queue() and mmc_queue_thread() from queue.c to block.c
>
> (2) actually makes sense since both functions are block IO specific.
>
> Thoughts? Preference? Other ideas?

Hi Grant,

Generally I am in favour of cleaning up messy code. But in this case
it now seems a bit overworked.

How about actually leaving it as is?

Kind regards
Ulf Hansson

>
> thanks,
> grant
>
> ps. It's more obvious now that the return value from
> mmc_blk_issue_rq() is getting ignored. *sigh*
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