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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-04-26 05:59:46 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-03 01:20:23 +1000 |
| commit | 723f268f19daddba56a987b934f3e34a04b6499d (patch) | |
| tree | 7b73238d632394769650f552f735277bb800b0ce /arch/powerpc/mm/hugetlbpage.c | |
| parent | 5fb84fec46015758271fcd2a746633fd4d48e619 (diff) | |
| download | linux-723f268f19daddba56a987b934f3e34a04b6499d.tar.gz linux-723f268f19daddba56a987b934f3e34a04b6499d.tar.bz2 linux-723f268f19daddba56a987b934f3e34a04b6499d.zip | |
powerpc/mm: cleanup ifdef mess in add_huge_page_size()
Introduce a subarch specific helper check_and_get_huge_psize()
to check the huge page sizes and cleanup the ifdef mess in
add_huge_page_size()
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hugetlbpage.c')
| -rw-r--r-- | arch/powerpc/mm/hugetlbpage.c | 37 |
1 files changed, 3 insertions, 34 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 036f408cfcb0..7b7027aae73f 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -549,13 +549,6 @@ unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) return vma_kernel_pagesize(vma); } -static inline bool is_power_of_4(unsigned long x) -{ - if (is_power_of_2(x)) - return (__ilog2(x) % 2) ? false : true; - return false; -} - static int __init add_huge_page_size(unsigned long long size) { int shift = __ffs(size); @@ -563,37 +556,13 @@ static int __init add_huge_page_size(unsigned long long size) /* Check that it is a page size supported by the hardware and * that it fits within pagetable and slice limits. */ - if (size <= PAGE_SIZE) - return -EINVAL; -#if defined(CONFIG_PPC_FSL_BOOK3E) - if (!is_power_of_4(size)) + if (size <= PAGE_SIZE || !is_power_of_2(size)) return -EINVAL; -#elif !defined(CONFIG_PPC_8xx) - if (!is_power_of_2(size) || (shift > SLICE_HIGH_SHIFT)) - return -EINVAL; -#endif - if ((mmu_psize = shift_to_mmu_psize(shift)) < 0) + mmu_psize = check_and_get_huge_psize(size); + if (mmu_psize < 0) return -EINVAL; -#ifdef CONFIG_PPC_BOOK3S_64 - /* - * We need to make sure that for different page sizes reported by - * firmware we only add hugetlb support for page sizes that can be - * supported by linux page table layout. - * For now we have - * Radix: 2M and 1G - * Hash: 16M and 16G - */ - if (radix_enabled()) { - if (mmu_psize != MMU_PAGE_2M && mmu_psize != MMU_PAGE_1G) - return -EINVAL; - } else { - if (mmu_psize != MMU_PAGE_16M && mmu_psize != MMU_PAGE_16G) - return -EINVAL; - } -#endif - BUG_ON(mmu_psize_defs[mmu_psize].shift != shift); /* Return if huge page size has already been setup */ |