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[POWERPC] Fix large hash table allocation on Cell blades

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My recent hack to allocate the hash table under 1GB on cell was poorly
tested, *cough*. It turns out on blades with large amounts of memory we
fail to allocate the hash table at all. This is because RTAS has been
instantiated just below 768MB, and 0-x MB are used by the kernel,
leaving no areas that are both large enough and also naturally-aligned.

For the cell IOMMU hack the page tables must be under 2GB, so use that
as the limit instead. This has been tested on real hardware and boots
happily.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2008-03-12 18:03:24 +11:00 committed by Paul Mackerras
parent 07dc42f632
commit 31bf111944
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/mm/hash_utils_64.c
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@ -506,10 +506,10 @@ void __init htab_initialize(void)
} else {
/* Find storage for the HPT. Must be contiguous in
* the absolute address space. On cell we want it to be
* in the first 1 Gig.
* in the first 2 Gig so we can use it for IOMMU hacks.
*/
if (machine_is(cell))
limit = 0x40000000;
limit = 0x80000000;
else
limit = 0;