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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-28 02:13:18 -0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-28 02:30:53 -0400
commit00df438e89a9003895948170e1abf64dd4665872 (patch)
treecd016a215b2df2785846f85b0d19bd4baed27bd4 /arch/powerpc/mm/hugetlbpage.c
parent025d7917a5ede982a5669c6735ef73a227b9827e (diff)
powerpc: Disable 64K hugetlb support when doing 64K SPU mappings
The 64K SPU local store mapping feature is incompatible with the 64K huge pages support due to the inability of some parts of the memory management to differenciate between them while they use a different page table format. For now, disable 64K huge pages when CONFIG_SPU_FS_64K_LS, in the long run, this can be fixed by making this feature use the hugetlb page table format. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/hugetlbpage.c')
-rw-r--r--arch/powerpc/mm/hugetlbpage.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index ed0aab0208a6..f1c2d55b4377 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -736,14 +736,21 @@ static int __init hugetlbpage_init(void)
736 736
737 if (!cpu_has_feature(CPU_FTR_16M_PAGE)) 737 if (!cpu_has_feature(CPU_FTR_16M_PAGE))
738 return -ENODEV; 738 return -ENODEV;
739
739 /* Add supported huge page sizes. Need to change HUGE_MAX_HSTATE 740 /* Add supported huge page sizes. Need to change HUGE_MAX_HSTATE
740 * and adjust PTE_NONCACHE_NUM if the number of supported huge page 741 * and adjust PTE_NONCACHE_NUM if the number of supported huge page
741 * sizes changes. 742 * sizes changes.
742 */ 743 */
743 set_huge_psize(MMU_PAGE_16M); 744 set_huge_psize(MMU_PAGE_16M);
744 set_huge_psize(MMU_PAGE_64K);
745 set_huge_psize(MMU_PAGE_16G); 745 set_huge_psize(MMU_PAGE_16G);
746 746
747 /* Temporarily disable support for 64K huge pages when 64K SPU local
748 * store support is enabled as the current implementation conflicts.
749 */
750#ifndef CONFIG_SPU_FS_64K_LS
751 set_huge_psize(MMU_PAGE_64K);
752#endif
753
747 for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { 754 for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
748 if (mmu_huge_psizes[psize]) { 755 if (mmu_huge_psizes[psize]) {
749 huge_pgtable_cache(psize) = kmem_cache_create( 756 huge_pgtable_cache(psize) = kmem_cache_create(