linux-kernel - Re: 2.6.23 boot failures on x86-64.

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Message-Id: <1193810651.817.14.camel@linux-znh>
Date:	31 Oct 2007 14:04:12 +0800
From:	Zou Nan hai <nanhai.zou@...el.com>
To:	Martin Ebourne <martin@...ler.org>
Cc:	Dave Jones <davej@...hat.com>, Andi Kleen <ak@...e.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>, stable@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: 2.6.23 boot failures on x86-64.

On Tue, 2007-10-30 at 05:21, Martin Ebourne wrote:
> On Mon, 2007-10-29 at 15:43 -0400, Dave Jones wrote:
> > On Mon, Oct 29, 2007 at 08:03:09PM +0100, Andi Kleen wrote:
> >  > >  > But if allocating bootmem >4G doesn't work on these systems
> >  > >  > most likely they have more problems anyways. It might be better
> >  > >  > to find out what goes wrong exactly.
> >  > > Any ideas on what to instrument ?
> >  > 
> >  > See what address the bootmem_alloc_high returns; check if it overlaps
> >  > with something etc.
> >  > 
> >  > Fill the memory on the system and see if it can access all of its memory.
> > 
> > Martin, as you have one of the affected systems, do you feel up to this?
> 
> Faking a node at 0000000000000000-000000001fff0000
> Bootmem setup node 0 0000000000000000-000000001fff0000
> sparse_early_mem_map_alloc: returned address ffff81000070b000
> 
> My box has 512MB of RAM.
> 
> Cheers,
> 
> Martin.

Oops, sorry,
seem to be a mistake of me.
I forget to exclude the DMA range.

Does the following patch fix the issue?

Thanks
Zou Nan hai

--- a/arch/x86/mm/init_64.c	2007-10-31 11:24:11.000000000 +0800
+++ b/arch/x86/mm/init_64.c	2007-10-31 12:31:02.000000000 +0800
@@ -731,7 +731,7 @@ int in_gate_area_no_task(unsigned long a
 void * __init alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size)
 {
 	return __alloc_bootmem_core(pgdat->bdata, size,
-			SMP_CACHE_BYTES, (4UL*1024*1024*1024), 0);
+			SMP_CACHE_BYTES, (4UL*1024*1024*1024), __pa(MAX_DMA_ADDRESS));
 }
 
 const char *arch_vma_name(struct vm_area_struct *vma)



 
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