Commit 31bf1119 authored by Michael Ellerman's avatar Michael Ellerman Committed by Paul Mackerras

[POWERPC] Fix large hash table allocation on Cell blades

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: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 07dc42f6
......@@ -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;
......
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