linux-kernel - Re: [PATCH 0/9] drivers: add new variants of devm_platform_ioremap

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Message-ID: <20190830155949.GA26757@lst.de>
Date:   Fri, 30 Aug 2019 17:59:49 +0200
From:   Christoph Hellwig <hch@....de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Alban Bedel <albeu@...e.fr>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 0/9] drivers: add new variants of
 devm_platform_ioremap_resource()

On Thu, Aug 29, 2019 at 04:48:36PM +0200, Geert Uytterhoeven wrote:
> Hi Bartosz,
> 
> On Thu, Aug 29, 2019 at 4:38 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > The new devm_platform_ioremap_resource() helper has now been widely
> > adopted and used in many drivers. Users of nocache and write-combined
> > ioremap() variants could profit from the same code shrinkage. This
> > series provides two new versions of devm_platform_ioremap_resource()
> > and uses it in a few example drivers with the assumption that - just
> > like was the case previously - a coccinelle script will be developed
> > to ease the transition for others.
> 
> Please be aware that the number of ioremap() variants is being
> reduced, as some of them are redundant (e.g. ioremap() already creates
> an uncached mapping, so ioremap_nocache() is not needed).
> So less is better than more ;-)

Yes.  If I can get the ia64 and openrisc patch in I plan to send Linus
a scripted removal of ioremap_nocache after -rc1.  I already have a
local patch for current mainline as of about two weeks ago.