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authorMichael Ellerman <michael@ellerman.id.au>2008-03-12 18:03:24 +1100
committerPaul Mackerras <paulus@samba.org>2008-03-13 10:10:26 +1100
commit31bf111944e31b64a7b692f9d660f71c5ff3d419 (patch)
treed35dd19288e3bc3529c1ccb00aacc74690f97776
parent07dc42f632e335a03c0e780805dc9dc141f83e63 (diff)
downloadlinux-2.6.38-lt-ux500-31bf111944e31b64a7b692f9d660f71c5ff3d419.tar.gz
[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: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/mm/hash_utils_64.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 32f416175db..590f1f67c87 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -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;