From: Bart Van Assche <Bart.VanAssche@sandisk.com>
To: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
Cc: "linux-parisc@vger.kernel.org" <linux-parisc@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"ysato@users.sourceforge.jp" <ysato@users.sourceforge.jp>,
"linux-xtensa@linux-xtensa.org" <linux-xtensa@linux-xtensa.org>,
"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
"jesper.nilsson@axis.com" <jesper.nilsson@axis.com>,
"mulix@mulix.org" <mulix@mulix.org>,
"hpa@zytor.com" <hpa@zytor.com>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
"uclinux-h8-devel@lists.sourceforge.jp"
<uclinux-h8-devel@lists.sourceforge.jp>,
"linux-hexagon@vger.kernel.org" <linux-hexagon@vger.kernel.org>,
"geoff@infradead.org" <geoff@infradead.org>,
"jcmvbkbc@gmail.com" <jcmvbkbc@gmail.com>,
"linux@armlinux.org.uk" <linux@armlinux.org.uk>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"linux-c6x-dev@linux-c6x.org" <linux-c6x-dev@linux-c6x.org>,
"linux-am33-list@redhat.com" <linux-am33-list@redhat.com>,
"linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
"linux-cris-kernel@axis.com" <linux-cris-kernel@axis.com>,
"linux-mips@linux-mips.org" <linux-mips@linux-mips.org>,
"linux-m68k@lists.linux-m68k.org"
<linux-m68k@lists.linux-m68k.org>,
"a-jacquiot@ti.com" <a-jacquiot@ti.com>,
"dalias@libc.org" <dalias@libc.org>,
"linux-metag@vger.kernel.org" <linux-metag@vger.kernel.org>,
"nios2-dev@lists.rocketboards.org"
<nios2-dev@lists.rocketboards.org>,
"linux-sh@vger.kernel.org" <linux-sh@vger.kernel.org>,
"shorne@gmail.com" <shorne@gmail.com>,
"lftan@altera.com" <lftan@altera.com>,
"deller@gmx.de" <deller@gmx.de>,
"jdmason@kudzu.us" <jdmason@kudzu.us>,
"linux-alpha@vger.kernel.org" <linux-alpha@vger.kernel.org>,
"openrisc@lists.librecores.org" <openrisc@lists.librecores.org>,
"sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>,
"chris@zankel.net" <chris@zankel.net>,
"davem@davemloft.net" <davem@davemloft.net>,
"joro@8bytes.org" <joro@8bytes.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"x86@kernel.org" <x86@kernel.org>,
"fenghua.yu@intel.com" <fenghua.yu@intel.com>,
"jejb@parisc-linux.org" <jejb@parisc-linux.org>,
"linux-snps-arc@lists.infradead.org"
<linux-snps-arc@lists.infradead.org>,
"msalter@redhat.com" <msalter@redhat.com>,
"dledford@redhat.com" <dledford@redhat.com>,
"adi-buildroot-devel@lists.sourceforge.net"
<adi-buildroot-devel@lists.sourceforge.net>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"starvik@axis.com" <starvik@axis.com>,
"dhowells@redhat.com" <dhowells@redhat.com>,
"hskinnemoen@gmail.com" <hskinnemoen@gmail.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"stefan.kristiansson@saunalahti.fi"
<stefan.kristiansson@saunalahti.fi>,
"tony.luck@intel.com" <tony.luck@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"jonas@southpole.se" <jonas@southpole.se>,
"geert@linux-m68k.org" <geert@linux-m68k.org>,
"egtvedt@samfundet.no" <egtvedt@samfundet.no>,
"will.deacon@arm.com" <will.deacon@arm.com>,
"linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>
Subject: Re: [PATCH 2/9] Move dma_ops from archdata into struct device
Date: Wed, 11 Jan 2017 18:17:03 +0000 [thread overview]
Message-ID: <1484158589.2619.14.camel@sandisk.com> (raw)
Message-ID: <20170111181703.pW6Ng4bymz7RvDQJX2eF9RRdSYxt_JB9KzSZc2jKNjk@z> (raw)
In-Reply-To: <20170111064803.GB26893@kroah.com>
On Wed, 2017-01-11 at 07:48 +0100, Greg Kroah-Hartman wrote:
> On Tue, Jan 10, 2017 at 04:56:41PM -0800, Bart Van Assche wrote:
> > Several RDMA drivers, e.g. drivers/infiniband/hw/qib, use the CPU to
> > transfer data between memory and PCIe adapter. Because of performance
> > reasons it is important that the CPU cache is not flushed when such
> > drivers transfer data. Make this possible by allowing these drivers to
> > override the dma_map_ops pointer. Additionally, introduce the function
> > set_dma_ops() that will be used by a later patch in this series.
>
> When you say things like "additionally", that's a huge flag that this
> needs to be split up into multiple patches. No need to add
> set_dma_ops() here in this patch.
Hello Greg,
Some architectures already define a set_dma_ops() function. So what this
patch does is to move both the dma_ops pointer and the set_dma_ops()
function from architecture-specific to architecture independent code. I
don't think that it is possible to separate these two changes. But I
understand that how I formulated the patch description caused confusion. I
will rewrite the patch description to make it more clear before I repost
this patch series.
> And I'd argue that it should be dma_ops_set(), and dma_ops_get(), just
> to keep the namespace sane, but that's probably a different set of
> patches...
Every time I rebase and retest this patch series on top of a new kernel
version I have to modify some of the patches to compensate for changes in
the architecture code. So I expect that once Linus merges these patches that
he will have to resolve one or more merge conflicts. Including a rename of
the functions that query and set the dma_ops pointer in this patch series
would increase the number of merge conflicts triggered by this patch series
and would make Linus' job harder. So I hope that you will allow me to
postpone that rename until a later time ...
Bart.
next prev parent reply other threads:[~2017-01-11 18:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170111005648.14988-1-bart.vanassche@sandisk.com>
2017-01-11 0:56 ` [PATCH 1/9] treewide: Constify most dma_map_ops structures Bart Van Assche
2017-01-11 0:56 ` Bart Van Assche
2017-01-11 0:56 ` [PATCH 2/9] Move dma_ops from archdata into struct device Bart Van Assche
2017-01-11 0:56 ` Bart Van Assche
2017-01-11 6:46 ` Greg Kroah-Hartman
2017-01-11 18:03 ` Bart Van Assche
2017-01-11 18:03 ` Bart Van Assche
2017-01-11 20:29 ` gregkh
2017-01-11 20:29 ` gregkh
2017-01-11 6:48 ` Greg Kroah-Hartman
2017-01-11 18:17 ` Bart Van Assche [this message]
2017-01-11 18:17 ` Bart Van Assche
2017-01-11 20:31 ` gregkh
2017-01-11 20:31 ` gregkh
2017-01-11 22:28 ` Bart Van Assche
2017-01-11 22:28 ` Bart Van Assche
2017-01-12 7:35 ` gregkh
2017-01-12 7:35 ` gregkh
Reply instructions:
You may reply publicly 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=1484158589.2619.14.camel@sandisk.com \
--to=bart.vanassche@sandisk.com \
--cc=a-jacquiot@ti.com \
--cc=adi-buildroot-devel@lists.sourceforge.net \
--cc=catalin.marinas@arm.com \
--cc=chris@zankel.net \
--cc=dalias@libc.org \
--cc=davem@davemloft.net \
--cc=deller@gmx.de \
--cc=dhowells@redhat.com \
--cc=dledford@redhat.com \
--cc=egtvedt@samfundet.no \
--cc=fenghua.yu@intel.com \
--cc=geert@linux-m68k.org \
--cc=geoff@infradead.org \
--cc=gregkh@linuxfoundation.org \
--cc=hpa@zytor.com \
--cc=hskinnemoen@gmail.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jcmvbkbc@gmail.com \
--cc=jdmason@kudzu.us \
--cc=jejb@parisc-linux.org \
--cc=jesper.nilsson@axis.com \
--cc=jonas@southpole.se \
--cc=joro@8bytes.org \
--cc=lftan@altera.com \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-am33-list@redhat.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-c6x-dev@linux-c6x.org \
--cc=linux-cris-kernel@axis.com \
--cc=linux-hexagon@vger.kernel.org \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-m68k@lists.linux-m68k.org \
--cc=linux-metag@vger.kernel.org \
--cc=linux-mips@linux-mips.org \
--cc=linux-parisc@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=linux-snps-arc@lists.infradead.org \
--cc=linux-xtensa@linux-xtensa.org \
--cc=linux@armlinux.org.uk \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mingo@redhat.com \
--cc=msalter@redhat.com \
--cc=mulix@mulix.org \
--cc=nios2-dev@lists.rocketboards.org \
--cc=openrisc@lists.librecores.org \
--cc=shorne@gmail.com \
--cc=sparclinux@vger.kernel.org \
--cc=starvik@axis.com \
--cc=stefan.kristiansson@saunalahti.fi \
--cc=tglx@linutronix.de \
--cc=tony.luck@intel.com \
--cc=uclinux-h8-devel@lists.sourceforge.jp \
--cc=will.deacon@arm.com \
--cc=x86@kernel.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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).