diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-04-26 08:59:46 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-02 18:20:23 +0300 |
| commit | 723f268f19daddba56a987b934f3e34a04b6499d (patch) | |
| tree | 7b73238d632394769650f552f735277bb800b0ce /arch/powerpc/include/asm/book3s | |
| parent | 5fb84fec46015758271fcd2a746633fd4d48e619 (diff) | |
| download | linux-723f268f19daddba56a987b934f3e34a04b6499d.tar.xz | |
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/include/asm/book3s')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/hugetlb.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/hugetlb.h b/arch/powerpc/include/asm/book3s/64/hugetlb.h index def77a45e905..56140d19c85f 100644 --- a/arch/powerpc/include/asm/book3s/64/hugetlb.h +++ b/arch/powerpc/include/asm/book3s/64/hugetlb.h @@ -107,4 +107,31 @@ static inline void hugepd_populate(hugepd_t *hpdp, pte_t *new, unsigned int pshi void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr); +static inline int check_and_get_huge_psize(int shift) +{ + int mmu_psize; + + if (shift > SLICE_HIGH_SHIFT) + return -EINVAL; + + mmu_psize = shift_to_mmu_psize(shift); + + /* + * 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; + } + return mmu_psize; +} + #endif |