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| author | Kirill A. Shutemov | 2016-03-01 05:15:14 +0100 |
|---|---|---|
| committer | Michael Ellerman | 2016-03-03 11:18:29 +0100 |
| commit | ff20c2e0acc5ad7e27c68592ade135efee399549 (patch) | |
| tree | ba2078e9b2def032e9722112e5ab9d82b5ac0de3 /include/linux/huge_mm.h | |
| parent | powerpc/mm: Switch book3s 64 with 64K page size to 4 level page table (diff) | |
| download | kernel-qcow2-linux-ff20c2e0acc5ad7e27c68592ade135efee399549.tar.gz kernel-qcow2-linux-ff20c2e0acc5ad7e27c68592ade135efee399549.tar.xz kernel-qcow2-linux-ff20c2e0acc5ad7e27c68592ade135efee399549.zip | |
mm: Some arch may want to use HPAGE_PMD related values as variables
With next generation power processor, we are having a new mmu model
[1] that require us to maintain a different linux page table format.
Inorder to support both current and future ppc64 systems with a single
kernel we need to make sure kernel can select between different page
table format at runtime. With the new MMU (radix MMU) added, we will
have two different pmd hugepage size 16MB for hash model and 2MB for
Radix model. Hence make HPAGE_PMD related values as a variable.
Actual conversion of HPAGE_PMD to a variable for ppc64 happens in a
followup patch.
[1] http://ibm.biz/power-isa3 (Needs registration).
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'include/linux/huge_mm.h')
| -rw-r--r-- | include/linux/huge_mm.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 459fd25b378e..f12513a20a06 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -111,9 +111,6 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, __split_huge_pmd(__vma, __pmd, __address); \ } while (0) -#if HPAGE_PMD_ORDER >= MAX_ORDER -#error "hugepages can't be allocated by the buddy allocator" -#endif extern int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, int advice); extern void vma_adjust_trans_huge(struct vm_area_struct *vma, |