linux-kernel - Re: Early boot panic on machine with lots of memory

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Date:	Wed, 27 Jun 2012 11:13:30 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Gavin Shan <shangw@...ux.vnet.ibm.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, hpa@...ux.intel.com,
	linux-mm <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Early boot panic on machine with lots of memory

Hello, Yinghai.

Sorry about the delay.  I'm in bug storm somehow. :(

On Fri, Jun 22, 2012 at 07:14:43PM -0700, Yinghai Lu wrote:
> On Fri, Jun 22, 2012 at 12:29 PM, Tejun Heo <tj@...nel.org> wrote:
> > I wish we had a single call - say, memblock_die(), or whatever - so
> > that there's a clear indication that memblock usage is done, but yeah
> > maybe another day.  Will review the patch itself.  BTW, can't you post
> > patches inline anymore?  Attaching is better than corrupt but is still
> > a bit annoying for review.
> 
> please check the three patches:

Heh, reviewing is cumbersome this way but here are my comments.

* "[PATCH] memblock: free allocated memblock_reserved_regions later"
  looks okay to me.

* "[PATCH] memblock: Free allocated memblock.memory.regions" makes me
  wonder whether it would be better to have something like the
  following instead.

  typedef void memblock_free_region_fn_t(unsigned long start, unsigned size);

  void memblock_free_regions(memblock_free_region_fn_t free_fn)
  {
	/* call free_fn() on reserved and memory regions arrays */
	/* clear both structures so that any further usage triggers warning */
  }

* "memblock: Add checking about illegal using memblock".
  Hmm... wouldn't it be better to be less explicit?  I think it's
  adding too much opencoded identical checks.  Maybe implement a
  common check & warning function?

Thanks.

-- 
tejun
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