From: Benjamin Herrenschmidt Date: Mon, 28 Jul 2008 06:13:18 +0000 (+1000) Subject: powerpc: Disable 64K hugetlb support when doing 64K SPU mappings X-Git-Tag: v2.6.27-rc1~27^2 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=00df438e89a9003895948170e1abf64dd4665872;p=linux-2.6-omap-h63xx.git 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 --- diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index ed0aab0208a..f1c2d55b437 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -736,14 +736,21 @@ static int __init hugetlbpage_init(void) if (!cpu_has_feature(CPU_FTR_16M_PAGE)) return -ENODEV; + /* Add supported huge page sizes. Need to change HUGE_MAX_HSTATE * and adjust PTE_NONCACHE_NUM if the number of supported huge page * sizes changes. */ set_huge_psize(MMU_PAGE_16M); - set_huge_psize(MMU_PAGE_64K); set_huge_psize(MMU_PAGE_16G); + /* Temporarily disable support for 64K huge pages when 64K SPU local + * store support is enabled as the current implementation conflicts. + */ +#ifndef CONFIG_SPU_FS_64K_LS + set_huge_psize(MMU_PAGE_64K); +#endif + for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { if (mmu_huge_psizes[psize]) { huge_pgtable_cache(psize) = kmem_cache_create(