3.16.60-rc1 review patch. If anyone has any objections, please let me know.
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From: "Aneesh Kumar K.V" aneesh.kumar@linux.vnet.ibm.com
commit 6fa504835d6969144b2bd3699684dd447c789ba2 upstream.
With 64k page size, we have hugetlb pte entries at the pmd and pud level for book3s64. We don't need to create a separate page table cache for that. With 4k we need to make sure hugepd page table cache for 16M is placed at PUD level and 16G at the PGD level.
Simplify all these by not using HUGEPD_PD_SHIFT which is confusing for book3s64.
Without this patch, with 64k page size we create pagetable caches with shift value 10 and 7 which are not used at all.
Fixes: 419df06eea5b ("powerpc: Reduce the PTE_INDEX_SIZE")
Signed-off-by: Aneesh Kumar K.V aneesh.kumar@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au [bwh: Backported to 3.16: Don't use an #ifdef because this implementation of hugetlbpage_init() is only used if CONFIG_PPC_BOOK3S_64 is enabled.] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -175,9 +175,6 @@ static int __hugepte_alloc(struct mm_str #ifdef CONFIG_PPC_FSL_BOOK3E #define HUGEPD_PGD_SHIFT PGDIR_SHIFT #define HUGEPD_PUD_SHIFT PUD_SHIFT -#else -#define HUGEPD_PGD_SHIFT PUD_SHIFT -#define HUGEPD_PUD_SHIFT PMD_SHIFT #endif
#ifdef CONFIG_PPC_BOOK3S_64 @@ -871,15 +868,17 @@ static int __init hugetlbpage_init(void)
shift = mmu_psize_to_shift(psize);
- if (add_huge_page_size(1ULL << shift) < 0) + if (shift > PGDIR_SHIFT) continue; - - if (shift < PMD_SHIFT) - pdshift = PMD_SHIFT; - else if (shift < PUD_SHIFT) + else if (shift > PUD_SHIFT) + pdshift = PGDIR_SHIFT; + else if (shift > PMD_SHIFT) pdshift = PUD_SHIFT; else - pdshift = PGDIR_SHIFT; + pdshift = PMD_SHIFT; + + if (add_huge_page_size(1ULL << shift) < 0) + continue; /* * if we have pdshift and shift value same, we don't * use pgt cache for hugepd.