From: David Miller <davem@davemloft.net>
To: arnd@arndb.de
Cc: fujita.tomonori@lab.ntt.co.jp, sparclinux@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sparc: use asm-generic/scatterlist.h
Date: Tue, 02 Mar 2010 05:55:34 -0800 (PST) [thread overview]
Message-ID: <20100302.055534.115500087.davem@davemloft.net> (raw)
In-Reply-To: <201003021454.12125.arnd@arndb.de>
From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 2 Mar 2010 14:54:11 +0100
> Broken in the sense that arch/powerpc/Kconfig describes CONFIG_IOMMU_VMERGE:
>
> Cause IO segments sent to a device for DMA to be merged virtually
> by the IOMMU when they happen to have been allocated contiguously.
> This doesn't add pressure to the IOMMU allocator. However, some
> drivers don't support getting large merged segments coming back
> from *_map_sg().
>
> Most drivers don't have this problem; it is safe to say Y here.
>
> I don't know if this comment still applies to any drivers in the mainline
> kernel, but it's possible.
That really has to be out of date these days.
next prev parent reply other threads:[~2010-03-02 13:55 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-26 0:43 FUJITA Tomonori
2010-02-26 12:35 ` David Miller
2010-03-01 6:05 ` FUJITA Tomonori
2010-03-01 7:03 ` David Miller
2010-03-01 11:29 ` Arnd Bergmann
2010-03-02 3:33 ` FUJITA Tomonori
2010-03-02 12:03 ` Arnd Bergmann
2010-03-02 12:25 ` FUJITA Tomonori
2010-03-02 13:38 ` Arnd Bergmann
2010-03-02 13:49 ` FUJITA Tomonori
2010-03-02 13:54 ` Arnd Bergmann
2010-03-02 13:55 ` David Miller [this message]
2010-03-02 14:06 ` FUJITA Tomonori
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=20100302.055534.115500087.davem@davemloft.net \
--to=davem@davemloft.net \
--cc=arnd@arndb.de \
--cc=fujita.tomonori@lab.ntt.co.jp \
--cc=linux-kernel@vger.kernel.org \
--cc=sparclinux@vger.kernel.org \
/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
all inboxes | Powered by JetHome®