linux-kernel - Re: [PATCH v3 0/3] zram/zsmalloc promotion

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Date:	Wed, 31 Oct 2012 09:19:00 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nitin Gupta <ngupta@...are.org>,
	Konrad Rzeszutek Wilk <konrad@...nok.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Jens Axboe <axboe@...nel.dk>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	gaowanlong@...fujitsu.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v3 0/3] zram/zsmalloc promotion

On Wed, Oct 31, 2012 at 04:02:02PM +0900, Minchan Kim wrote:
> On Tue, Oct 30, 2012 at 07:43:07PM -0700, Greg Kroah-Hartman wrote:
> > On Wed, Oct 31, 2012 at 11:39:48AM +0900, Minchan Kim wrote:
> > > Greg, what do you think about LTSI?
> > > Is it proper feature to add it? For it, still do I need ACK from mm developers?
> > 
> > It's already in LTSI, as it's in the 3.4 kernel, right?
> 
> Right. But as I look, it seems to be based on 3.4.11 which doesn't have
> recent bug fix and enhances and current 3.4.16 also doesn't include it.

You can ask for those bugfixes to get backported to the stable/longterm
kernel tree, see Documentation/stable_kernel_rules.txt for how to do
this properly.

> Just out of curiosity.
> 
> Is there any rule about update period in long-term kernel?
> I mean how often you release long-term kernel.

About once a week lately.

> Is there any rule about update period in LTSI kernel based on long-term kernel?

No, the LTSI kernel work has been slow due to the lack of time on my
part lately.

> If I get the answer on above two quesion, I can expect later what LTSI kernel
> version include feature I need.
> 
> Another question.
> For example, There is A feature in mainline and A has no problem but
> someone invents new wheel "B" which is better than A so it replace A totally
> in recent mainline. As following stable-kernel rule, it's not a real bug fix
> so I guess stable kernel will never replace A with B.

That is correct.

> It means LTSI never get a chance to use new wheel. Right?

No, you can submit the same patches for the LTSI kernel as well, they
will probably be accepted as the rules are much more "loose" for the
LTSI tree compared to the normal stable/longterm kernel rules.  Which is
the primary reason it is around.

Hope this helps,

greg k-h
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