linux-kernel - RE: [PATCH 8/9] dspbridge: add map support for big buffers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <496565EC904933469F292DDA3F1663E602F10ED4B1@dlee06.ent.ti.com>
Date:	Thu, 26 Aug 2010 07:38:26 -0500
From:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ohad@...ery.com" <ohad@...ery.com>,
	"hiroshi.doyu@...ia.com" <hiroshi.doyu@...ia.com>,
	"ameya.palande@...ia.com" <ameya.palande@...ia.com>,
	"felipe.contreras@...ia.com" <felipe.contreras@...ia.com>
Subject: RE: [PATCH 8/9] dspbridge: add map support for big buffers


Hi Fujita,
________________________________________
>From: FUJITA Tomonori [fujita.tomonori@....ntt.co.jp]
>Sent: Thursday, August 26, 2010 1:55 AM
>To: Guzman Lugo, Fernando
>Cc: linux-omap@...r.kernel.org; linux-kernel@...r.kernel.org; ohad@...ery.com; hiroshi.doyu@...ia.com; ameya.palande@...ia.com; felipe.contreras@...ia.com
>Subject: Re: [PATCH 8/9] dspbridge: add map support for big buffers
>
>On Wed, 30 Jun 2010 19:20:59 -0500
>Fernando Guzman Lugo <x0095840@...com> wrote:
>
>> due to a restriction in scatter gather lists, it can
>> not be created a list for a buffer bigger than 1MB.
>> This patch is spliting big mappings into 1MB mappings.
>
>I don't read the whole thread but the above description is incorrect.
>
>Why can't you use scatter gather chaining? You can create a scatter
>list for a buffer larger than 1MB.

The thing is that ARM architecture does not support SG chaining. This patch should be
seen like a workaround until it is fixed in iovmm module.

Thanks and regards,
Fernando.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/