linux-kernel - Re: [PATCH 2/2] x86_64: make early_node

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Date:	Tue, 29 Jan 2008 09:41:53 -0800
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Andi Kleen <ak@...e.de>
Cc:	Ingo Molnar <mingo@...e.hu>, Christoph Lameter <clameter@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86_64: make early_node_mem return align address

On Tuesday 29 January 2008 01:33:29 am Andi Kleen wrote:
> On Tuesday 29 January 2008 10:05, Yinghai Lu wrote:
> > [PATCH 2/2] x86_64: make early_node_mem return align address
> >
> > boot oops when system get 64g or 128g installed
> 
> Probably it should just use reserve_early(). Does this patch work?
>  
> The alignment change is needed at some point too, but only to 
> relax the alignment to not force all early allocations to be page
> padded.

No, my patch doesn't force all early allocations to be page padded.
for find_e820_mem, i just change PAGE_ALIGN to be aligned align parameter....

only make early_node_mem have aligned data. because it seems it like to...and assume that.

I think your patch will get early panic about overlap between bss and bootmem...
like the 256g machine, bss is overlapped with early page table...

so could change 

-       node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size);
+       node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size,
+                                          ZONE_ALIGN);

===>

-       node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size);
+       node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size,
+                                          PAGE_SIZE);


or

-       if (mem != -1L)
+       if (mem != -1L) {
+               mem = round_up(mem, PAGE_SIZE);
                return __va(mem);
+       }

YH

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