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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2014-11-05 21:57:40 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2014-11-14 17:24:21 +1100
commitf30c59e921f12b209852e1ddc197dc6a8fb0142b (patch)
tree392c066f3053fcf6f4683fbe6da3a0a06b091cc7 /include/linux/hugetlb.h
parent06743521d0eae1263a09bccb1a92a9fbb94660b3 (diff)
downloadop-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.h46
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"
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