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SubjectRe: 2.6.39.1 immediately reboots/resets on EFI system
Hi Matthew,

2011/6/3 Matthew Garrett <mjg59@srcf.ucam.org>:
> On Fri, Jun 03, 2011 at 04:26:27PM +0200, Jim Bos wrote:
>> On 06/03/2011 03:33 PM, Matthew Garrett wrote:
>> > ? You've got 143 boot services/code regions, which is more than I'd
>> > tested against, so I'm unsure whether we're overflowing something here.
>> >
>>
>> That's seems to be the only EFI patch in 2.6.39.1 and I effectively
>> removed by =not= applying (skipping) the parts of the 2.6.39.1 patch to
>> above 3 files.
>> So yes removing "x86, efi: Retain boot service code until after
>> switching to virtual mode" indeed fixes the problem for me.
>
> Ok, thanks. I'll look into that. Might be best to drop it from stable
> for the moment until I've made sure it works on machines with excessive
> maps.

Looking at your patch in 2.6.39.1

I see:
+ memblock_x86_reserve_range(start, start + size, "EFI Boot");

and to free it:
+ free_bootmem_late(start, size);

Maybe this is causing the pager issue on 3.0, can you test this patch?


efi: free memory with the correct call

Commit 916f676f8dc introduced a call to free_bootmem_late while it
reserves memory with memblock_x64_reserve_range
Fix this call to silence the swapper BUGs:

BUG: Bad page state in process swapper pfn:00000
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 0d3a4fa..d2eefaa 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -29,7 +29,6 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/efi.h>
-#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
@@ -334,7 +333,7 @@ static void __init efi_free_boot_services(void)
md->type != EFI_BOOT_SERVICES_DATA)
continue;

- free_bootmem_late(start, size);
+ memblock_x86_free_memory_in_range(start, start + size);
}
}

--
~Maarten


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