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SubjectRe: [PATCH 1/2] boot: increase stack size for kernel boot loader decompressor
Alexander van Heukelum wrote:
> On Fri, Apr 04, 2008 at 06:30:15PM -0700, Mike Travis wrote:
>> * Increase stack size for the kernel bootloader decompressor. This is
>> needed to boot a kernel with NR_CPUS = 4096. I tested with 8k stack
>> size but that wasn't sufficient.
>>
>> Based on:
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
>> + x86/latest .../x86/linux-2.6-x86.git
>> + sched-devel/latest .../mingo/linux-2.6-sched-devel.git
>>
>> Signed-off-by: Mike Travis <travis@sgi.com>
>> ---
>> arch/x86/boot/compressed/head_64.S | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> --- linux-2.6.25-rc5.orig/arch/x86/boot/compressed/head_64.S
>> +++ linux-2.6.25-rc5/arch/x86/boot/compressed/head_64.S
>> @@ -314,5 +314,5 @@ gdt_end:
>> /* Stack for uncompression */
>> .balign 4
>> user_stack:
>> - .fill 4096,4,0
>> + .fill 16384,4,0
> --------------^^^ * ^
>
> Changed from 16K to 64K. I wonder what is using so much space on
> this stack?
>
>> user_stack_end:
>>
>> --

Hi,

That is a good question. It's pretty difficult to debug at that early
stage (any ideas are certainly welcome!). It's mostly hit and miss (and
handy access to the reset button ;-) I could do some further research
but since it's "throwaway" memory (at least I think it is), then I didn't
think it important to pursue.

And thanks for the correction, I thought I was bumping a byte count, not
a word count.

Thanks,
Mike


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