linux-kernel - Re: [PATCH v2 3/3] mtd: nand: squash struct nand_buffers into struct nand

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Date:   Tue, 5 Dec 2017 14:30:15 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Kamal Dasu <kdasu.kdev@...il.com>,
        Richard Weinberger <richard@....at>, Han Xu <han.xu@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Broadcom Kernel Feedback List 
        <bcm-kernel-feedback-list@...adcom.com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/3] mtd: nand: squash struct nand_buffers into
 struct nand_chip

Hi Masahiro,

On Tue, 5 Dec 2017 21:28:55 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:

> Hi Boris,
> 
> 2017-12-05 20:57 GMT+09:00 Boris Brezillon <boris.brezillon@...e-electrons.com>:
> >>
> >>
> >> Sorry, I missed to update omap2.c
> >>
> >> I will send v3.  
> >
> > No need to send a v3, I already fixed it when applying [1].
> >
> > [1]https://github.com/bbrezillon/linux-0day/commit/59a7bfff7103d48713b2125c3844400301a3d028
> >  
> 
> Thank you for your kind help!
> 
> 

No problem.

Thanks for working on improving the NAND framework, and if you're
looking for other things to cleanup in this area, I have a long TODO
list, so don't hesitate to ask. Just one example: I'd like to
dynamically allocate the onfi/jedec_params [1] struct instead of
embedding them in the nand_chip struct, because this increases the size
of the nand_chip object for everyone, even for those who don't have
ONFI/JEDEC compliant chips.

This should also allow us to get rid of the onfi/jedec_version fields
(if chip->onfi_params or chip->jedec_params are NULL, the NAND is not
ONFI or JEDEC compliant and the version has no meaning, if it's not
NULL, the version can be directly retrieved from the ->onfi/jedec_params
object itself).

Regards,

Boris

[1]http://elixir.free-electrons.com/linux/v4.15-rc2/source/include/linux/mtd/rawnand.h#L922