linux-kernel - Re: [PATCH] mm,x86: initialize high mem before free_all

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Date:	Tue, 6 Dec 2011 11:36:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	linux-mm@...ck.org, x86@...nel.org, linux-kernel@...r.kernel.org,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] mm,x86: initialize high mem before free_all_bootmem()


* Stanislaw Gruszka <sgruszka@...hat.com> wrote:

> On Tue, Dec 06, 2011 at 09:25:55AM +0100, Ingo Molnar wrote:
> > The thing is, the pagealloc bug you fixed basically kept 
> > pagealloc debugging essentially disabled for a really long time, 
> > correct?
> Yes, it worked only in special cases.
>  
> > So i'd expect there to be quite a few latent problems - 
> > i'll give it some more testing before pushing out the result.
>
> Ehh, I expect them too, but fortunately only with 
> CONFIG_DEBUG_PAGEALLOC, non-debug kernel are not affected.

I test DEBUG_PAGEALLOC=y kernels all the time - i just booted a 
32-bit and a 64-bit allyesconfig kernel an hour ago.

Miraculously everything appears to be in working order so far.

Thanks,

	Ingo
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