linux-kernel - Re: [PATCH 1/5] ASoC: sh: rz-ssi: Drop calling rz_ssi_pio

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Message-ID: <f69a0650-174f-1b0d-ba29-7fe04c7cf211@intel.com>
Date:   Mon, 10 Jan 2022 18:48:39 +0100
From:   Cezary Rojewski <cezary.rojewski@...el.com>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Pavel Machek <pavel@...x.de>
CC:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        alsa-devel <alsa-devel@...a-project.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] ASoC: sh: rz-ssi: Drop calling rz_ssi_pio_recv()
 recursively

On 2022-01-10 5:03 PM, Lad, Prabhakar wrote:
> Hi Cezary,
> 
> Thank you for the review.
> 

...

>> Recursion and loops are means for doing something repeatedly. Could you
>> specify _why_ such change was made i.e. the conversion from one method
>> into the other? I bet the code is not being changed for the sake of
>> changing it, the reason is simply missing in the commit message.
>>
> I had feedback from Pavel "recursion is unwelcome in kernel due to
> limited stack use." which I did agree with as a result I have come up
> with this patch. Also to add this driver will later be used on Renesas
> RZ/A2 SoC's which runs with limited memory.

Adding that reasoning to the commits message will prevent questions 
(such as mine) in the future. Thank you for a quick reply and a 
transparent answer.


Regards,
Czarek