Linux SNPS ARC Archive on lore.kernel.org
 help / color / Atom feed
From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Krzysztof Kozlowski <krzk@kernel.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rich Felker <dalias@libc.org>, Jiri Slaby <jirislaby@gmail.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	David Airlie <airlied@linux.ie>,
	nouveau@lists.freedesktop.org, Jason Wang <jasowang@redhat.com>,
	DRI Development <dri-devel@lists.freedesktop.org>,
	virtualization@lists.linux-foundation.org,
	"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
	Paul Mackerras <paulus@samba.org>,
	Linux-Arch <linux-arch@vger.kernel.org>,
	Dave Jiang <dave.jiang@intel.com>,
	Yoshinori Sato <ysato@users.sourceforge.jp>,
	Helge Deller <deller@gmx.de>,
	Linux-sh list <linux-sh@vger.kernel.org>,
	Alexey Brodkin <abrodkin@synopsys.com>,
	Ben Skeggs <bskeggs@redhat.com>, Dave Airlie <airlied@redhat.com>,
	Matt Turner <mattst88@gmail.com>,
	arcml <linux-snps-arc@lists.infradead.org>,
	Nick Kossifidis <mickflemm@gmail.com>,
	Allen Hubbe <allenbh@gmail.com>, Arnd Bergmann <arnd@arndb.de>,
	Jon Mason <jdmason@kudzu.us>,
	Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
	Thomas Gleixner <tglx@linutronix.de>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Kalle Valo <kvalo@codeaurora.org>,
	Richard Henderson <rth@twiddle.net>,
	Parisc List <linux-parisc@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>,
	linux-wireless <linux-wireless@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Vineet Gupta <vgupta@synopsys.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	alpha <linux-alpha@vger.kernel.org>,
	linux-ntb@googlegroups.com,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux Media Mailing List <linux-media@vger.kernel.org>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [RFT 00/13] iomap: Constify ioreadX() iomem argument
Date: Wed, 8 Jan 2020 09:35:54 +0100
Message-ID: <2355489c-a207-1927-54cf-85c04b62f18f@c-s.fr> (raw)
In-Reply-To: <CAJKOXPfq9vS4kSyx1jOPHBvi9_HjviRv0LU2A8ZwdmqgUuebHQ@mail.gmail.com>



Le 08/01/2020 à 09:18, Krzysztof Kozlowski a écrit :
> On Wed, 8 Jan 2020 at 09:13, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>
>> Hi Krzysztof,
>>
>> On Wed, Jan 8, 2020 at 9:07 AM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>>> On Tue, Jan 7, 2020 at 5:53 PM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>>>> The ioread8/16/32() and others have inconsistent interface among the
>>>> architectures: some taking address as const, some not.
>>>>
>>>> It seems there is nothing really stopping all of them to take
>>>> pointer to const.
>>>
>>> Shouldn't all of them take const volatile __iomem pointers?
>>> It seems the "volatile" is missing from all but the implementations in
>>> include/asm-generic/io.h.
>>
>> As my "volatile" comment applies to iowrite*(), too, probably that should be
>> done in a separate patch.
>>
>> Hence with patches 1-5 squashed, and for patches 11-13:
>> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> 
> I'll add to this one also changes to ioreadX_rep() and add another
> patch for volatile for reads and writes. I guess your review will be
> appreciated once more because of ioreadX_rep()
> 

volatile should really only be used where deemed necessary:

https://www.kernel.org/doc/html/latest/process/volatile-considered-harmful.html

It is said: " ...  accessor functions might use volatile on 
architectures where direct I/O memory access does work. Essentially, 
each accessor call becomes a little critical section on its own and 
ensures that the access happens as expected by the programmer."

Christophe

_______________________________________________
linux-snps-arc mailing list
linux-snps-arc@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-snps-arc

  reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-07 16:52 Krzysztof Kozlowski
2020-01-07 16:52 ` [RFT 01/13] iomap: Constify ioreadX() iomem argument (as in generic implementation) Krzysztof Kozlowski
2020-01-07 16:52 ` [RFT 02/13] alpha: " Krzysztof Kozlowski
2020-01-08  8:10   ` Geert Uytterhoeven
2020-01-08  9:07     ` Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 02/13] sh: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 03/13] alpha: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 03/13] sh: " Krzysztof Kozlowski
2020-01-07 17:08   ` Arnd Bergmann
2020-01-07 16:53 ` [RFT 04/13] parisc: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 05/13] powerpc: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 06/13] arc: " Krzysztof Kozlowski
2020-01-07 17:10   ` Arnd Bergmann
2020-01-07 16:53 ` [RFT 07/13] drm/mgag200: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 08/13] drm/nouveau: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 09/13] media: fsl-viu: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 10/13] net: wireless: ath5k: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 11/13] net: wireless: rtl818x: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 12/13] ntb: intel: " Krzysztof Kozlowski
2020-01-07 16:53 ` [RFT 13/13] virtio: pci: " Krzysztof Kozlowski
2020-01-08  8:07 ` [RFT 00/13] iomap: Constify ioreadX() iomem argument Geert Uytterhoeven
2020-01-08  8:12   ` Geert Uytterhoeven
2020-01-08  8:18     ` Krzysztof Kozlowski
2020-01-08  8:35       ` Christophe Leroy [this message]
2020-01-08  8:43         ` Geert Uytterhoeven
2020-01-08  8:48           ` Christophe Leroy
2020-01-08 17:39             ` David Laight
2020-01-08  8:44         ` Arnd Bergmann
2020-01-08  9:15           ` Krzysztof Kozlowski
2020-01-08 11:55             ` Arnd Bergmann
2020-01-08  8:15   ` Krzysztof Kozlowski

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=2355489c-a207-1927-54cf-85c04b62f18f@c-s.fr \
    --to=christophe.leroy@c-s.fr \
    --cc=James.Bottomley@hansenpartnership.com \
    --cc=abrodkin@synopsys.com \
    --cc=airlied@linux.ie \
    --cc=airlied@redhat.com \
    --cc=akpm@linux-foundation.org \
    --cc=allenbh@gmail.com \
    --cc=arnd@arndb.de \
    --cc=bskeggs@redhat.com \
    --cc=dalias@libc.org \
    --cc=daniel@ffwll.ch \
    --cc=dave.jiang@intel.com \
    --cc=davem@davemloft.net \
    --cc=deller@gmx.de \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=geert@linux-m68k.org \
    --cc=ink@jurassic.park.msu.ru \
    --cc=jasowang@redhat.com \
    --cc=jdmason@kudzu.us \
    --cc=jirislaby@gmail.com \
    --cc=krzk@kernel.org \
    --cc=kvalo@codeaurora.org \
    --cc=linux-alpha@vger.kernel.org \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-media@vger.kernel.org \
    --cc=linux-ntb@googlegroups.com \
    --cc=linux-parisc@vger.kernel.org \
    --cc=linux-sh@vger.kernel.org \
    --cc=linux-snps-arc@lists.infradead.org \
    --cc=linux-wireless@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mattst88@gmail.com \
    --cc=mcgrof@kernel.org \
    --cc=mchehab@kernel.org \
    --cc=mickflemm@gmail.com \
    --cc=mst@redhat.com \
    --cc=netdev@vger.kernel.org \
    --cc=nouveau@lists.freedesktop.org \
    --cc=paulus@samba.org \
    --cc=rth@twiddle.net \
    --cc=tglx@linutronix.de \
    --cc=vgupta@synopsys.com \
    --cc=virtualization@lists.linux-foundation.org \
    --cc=ysato@users.sourceforge.jp \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux SNPS ARC Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-snps-arc/0 linux-snps-arc/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-snps-arc linux-snps-arc/ https://lore.kernel.org/linux-snps-arc \
		linux-snps-arc@lists.infradead.org
	public-inbox-index linux-snps-arc

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-snps-arc


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git