Re: [Crash-utility] [PATCH] CONFIG_SPARSEMEM for s390(x)
David J. Wilder wrote:
On Tue, 2008-08-12 at 17:12 +0200, Michael Holzheu wrote:
>Hi Dave,
>
>When starting crash on s390(x) with CONFIG_SPARSEMEM enabled we get the
>following error message:
>
>crash: CONFIG_SPARSEMEM kernels not supported for this architecture
>
>The following patch fixes this problem, but I am not sure, if I set
>_MAX_PHYSMEM_BITS to the correct value (I used 31 for s390 and 64 for
>s390x). Could you please explain the meaning of _MAX_PHSYSMEM_BITS?
>---
>
_MAX_PHSYSMEM_BITS is the number of physical addressing bits provided by
the hardware. It is defined as MAX_PHSYSMEM_BITS in asm/sparsemem.h.
Yeah -- I've been having a side discussion with Michael about this,
re: the need for his patch to use the correct MAX_PHYSMEM_BITS values
from sparsemem.h, as well as to initialize machdep->section_size_bits
with the appropriate _SECTION_SIZE_BITS values from the same file.
Dave