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mm: Update generic gup implementation to handle hugepage directory

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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>
This commit is contained in:
Aneesh Kumar K.V 2014-11-05 21:57:40 +05:30 • committed by Michael Ellerman
parent 06743521d0
commit f30c59e921
3 changed files with 120 additions and 8 deletions
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46
include/linux/hugetlb.h
View file

@ -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"