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

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Message-ID: <20130225164929.GB10672@phenom.dumpdata.com>
Date:	Mon, 25 Feb 2013 11:49:29 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Roger Pau Monné <roger.pau@...rix.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 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?

Thanks!
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