netdev - Re: [PATCH 1/2 v5] usbnet: allow status interrupt URB to always be active

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: <CACVXFVNHoBNpyRztp1Bu_41=YnszqQ3jQDw4j87Zd2hZM3r-VA@mail.gmail.com>
Date:	Thu, 11 Apr 2013 18:03:09 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Dan Williams <dcbw@...hat.com>,
	Elina Pasheva <epasheva@...rrawireless.com>,
	Network Development <netdev@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	Rory Filer <rfiler@...rrawireless.com>,
	Phil Sutter <phil@....cc>
Subject: Re: [PATCH 1/2 v5] usbnet: allow status interrupt URB to always be active

On Thu, Apr 11, 2013 at 5:53 PM, Oliver Neukum <oliver@...kum.org> wrote:
> On Thursday 11 April 2013 16:09:16 Ming Lei wrote:
>>
>> Could you explain why work queue need GFP_NOIO?
>
> Your fix for the memory allocation depends on it happening in the same
> context. If you execute code on a work queue this happens in the context
> of a kernel thread.

I understand the interface might be called from workqueue, and my question
is why GFP_NOIO is needed in the work queue context. Generally speaking,
GFP_KERNEL is enough for work queue context.

As we discussed before, GFP_NOIO is required in runtime resume context
and reset context, and the two contexts have been addressed automatically.
So looks you didn't answer my question, :-)

I mean if GFP_NOIO isn't needed, we can use GFP_KERNEL directly, and
the extra parameter isn't need.

Thanks,
-- 
Ming Lei
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html