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author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2014-11-05 21:57:40 +0530 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2014-11-14 17:24:21 +1100 |
commit | f30c59e921f12b209852e1ddc197dc6a8fb0142b (patch) | |
tree | 392c066f3053fcf6f4683fbe6da3a0a06b091cc7 /include/linux/hugetlb.h | |
parent | 06743521d0eae1263a09bccb1a92a9fbb94660b3 (diff) | |
download | op-kernel-dev-f30c59e921f12b209852e1ddc197dc6a8fb0142b.zip op-kernel-dev-f30c59e921f12b209852e1ddc197dc6a8fb0142b.tar.gz |
mm: Update generic gup implementation to handle hugepage directory
Update generic gup implementation with powerpc specific details.
On powerpc at pmd level we can have hugepte, normal pmd pointer
or a pointer to the hugepage directory.
Tested-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Steve Capper <steve.capper@linaro.org>
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/hugetlb.h')
-rw-r--r-- | include/linux/hugetlb.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 6e6d338..e6b62f3 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -175,6 +175,52 @@ static inline void __unmap_hugepage_range(struct mmu_gather *tlb, } #endif /* !CONFIG_HUGETLB_PAGE */ +/* + * hugepages at page global directory. If arch support + * hugepages at pgd level, they need to define this. + */ +#ifndef pgd_huge +#define pgd_huge(x) 0 +#endif + +#ifndef pgd_write +static inline int pgd_write(pgd_t pgd) +{ + BUG(); + return 0; +} +#endif + +#ifndef pud_write +static inline int pud_write(pud_t pud) +{ + BUG(); + return 0; +} +#endif + +#ifndef is_hugepd +/* + * Some architectures requires a hugepage directory format that is + * required to support multiple hugepage sizes. For example + * a4fe3ce76 "powerpc/mm: Allow more flexible layouts for hugepage pagetables" + * introduced the same on powerpc. This allows for a more flexible hugepage + * pagetable layout. + */ +typedef struct { unsigned long pd; } hugepd_t; +#define is_hugepd(hugepd) (0) +#define __hugepd(x) ((hugepd_t) { (x) }) +static inline int gup_huge_pd(hugepd_t hugepd, unsigned long addr, + unsigned pdshift, unsigned long end, + int write, struct page **pages, int *nr) +{ + return 0; +} +#else +extern int gup_huge_pd(hugepd_t hugepd, unsigned long addr, + unsigned pdshift, unsigned long end, + int write, struct page **pages, int *nr); +#endif #define HUGETLB_ANON_FILE "anon_hugepage" |