linux-kernel - Re: [Xen-devel] [PATCH] xen-blkfront: switch from llist to list

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Date:	Mon, 25 Feb 2013 18:00:57 +0100
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>
Subject: Re: [Xen-devel] [PATCH] xen-blkfront: switch from llist to list

On 25/02/13 17:49, Konrad Rzeszutek Wilk wrote:
> On Fri, Feb 15, 2013 at 08:12:52PM +0100, Roger Pau Monné wrote:
>> On 15/02/13 19:56, Konrad Rzeszutek Wilk wrote:
>>>> Should be backported to 3.8 stable.
>>>
>>> Lets do one thing at a time.
>>>
>>> The patch I have in the tree (and that I've asked Jens to pull for 3.9 - so
>>> he might have already in his tree) is the old hybrid where we still use llist
>>> but change the loop from 'for' to 'while'.
>>>
>>> This is the stable/for-jens-3.8 tree in git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git 
>>>
>>> Could you rebase your patch on top of that tree and just simplify the loop?
>>>
>>> Sorry about the mess about this - but I had already pulled the trigger
>>> so to say - hoping that Jens would pull the tree and do a git pull to Linus.
>>>
>>> And you are absolutly sure that we don't need any extra locking when switching
>>> over to list_head? Say if blkif_completion is called while we are
>>> processing in blkif_queue_request and doing ?
>>
>> Will recheck it, but blkif_completition is called with the io_lock hold,
>> as does blkif_queue_request (I've added extra assert_spin_locked before
>> every list modification).
> 
> Can you rebase this patch on top of 'stable/for-jens-3.9' when you get a chance
> please?

Yes, I was going to resubmit it as part of my indirect descriptors
series (which I'm hoping to send before the end of the week), but if you
are in a rush I can send it earlier, I already have it rebased on top of
for-jens-3.9.

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