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authorChris Metcalf <cmetcalf@tilera.com>2013-08-10 19:15:46 +0200
committerChris Metcalf <cmetcalf@tilera.com>2013-08-30 17:57:02 +0200
commita718e10cbaa28035b7ab510d68fef68524454e1a (patch)
tree64b9283a5d94e2aa78046cc52f47757a8224d8ed
parenttilegx: change how we find the kernel stack (diff)
downloadlinux-a718e10cbaa28035b7ab510d68fef68524454e1a.tar.xz
linux-a718e10cbaa28035b7ab510d68fef68524454e1a.zip
tile: handle super huge pages in virt_to_pte
This tile-specific API had a minor bug, in that if a super huge (>4GB) page mapped a particular address range, we wouldn't handle it correctly. As part of fixing that bug, I also cleaned up some of the pud and pmd accessors to make them more consistent. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
-rw-r--r--arch/tile/include/asm/pgtable_32.h2
-rw-r--r--arch/tile/include/asm/pgtable_64.h24
-rw-r--r--arch/tile/mm/pgtable.c3
3 files changed, 22 insertions, 7 deletions
diff --git a/arch/tile/include/asm/pgtable_32.h b/arch/tile/include/asm/pgtable_32.h
index 4ce4a7a99c24..e5bdc0ea85c6 100644
--- a/arch/tile/include/asm/pgtable_32.h
+++ b/arch/tile/include/asm/pgtable_32.h
@@ -84,6 +84,8 @@ extern unsigned long VMALLOC_RESERVE /* = CONFIG_VMALLOC_RESERVE */;
/* We have no pmd or pud since we are strictly a two-level page table */
#include <asm-generic/pgtable-nopmd.h>
+static inline int pud_huge_page(pud_t pud) { return 0; }
+
/* We don't define any pgds for these addresses. */
static inline int pgd_addr_invalid(unsigned long addr)
{
diff --git a/arch/tile/include/asm/pgtable_64.h b/arch/tile/include/asm/pgtable_64.h
index 2492fa5478e7..7cb8d355f91b 100644
--- a/arch/tile/include/asm/pgtable_64.h
+++ b/arch/tile/include/asm/pgtable_64.h
@@ -63,6 +63,15 @@
/* We have no pud since we are a three-level page table. */
#include <asm-generic/pgtable-nopud.h>
+/*
+ * pmds are the same as pgds and ptes, so converting is a no-op.
+ */
+#define pmd_pte(pmd) (pmd)
+#define pmdp_ptep(pmdp) (pmdp)
+#define pte_pmd(pte) (pte)
+
+#define pud_pte(pud) ((pud).pgd)
+
static inline int pud_none(pud_t pud)
{
return pud_val(pud) == 0;
@@ -73,6 +82,11 @@ static inline int pud_present(pud_t pud)
return pud_val(pud) & _PAGE_PRESENT;
}
+static inline int pud_huge_page(pud_t pud)
+{
+ return pud_val(pud) & _PAGE_HUGE_PAGE;
+}
+
#define pmd_ERROR(e) \
pr_err("%s:%d: bad pmd 0x%016llx.\n", __FILE__, __LINE__, pmd_val(e))
@@ -89,6 +103,9 @@ static inline int pud_bad(pud_t pud)
/* Return the page-table frame number (ptfn) that a pud_t points at. */
#define pud_ptfn(pud) hv_pte_get_ptfn((pud).pgd)
+/* Return the page frame number (pfn) that a pud_t points at. */
+#define pud_pfn(pud) pte_pfn(pud_pte(pud))
+
/*
* A given kernel pud_t maps to a kernel pmd_t table at a specific
* virtual address. Since kernel pmd_t tables can be aligned at
@@ -152,13 +169,6 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
return hv_pte(__insn_exch(&ptep->val, 0UL));
}
-/*
- * pmds are the same as pgds and ptes, so converting is a no-op.
- */
-#define pmd_pte(pmd) (pmd)
-#define pmdp_ptep(pmdp) (pmdp)
-#define pte_pmd(pte) (pte)
-
#endif /* __ASSEMBLY__ */
#endif /* _ASM_TILE_PGTABLE_64_H */
diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c
index e41487e22163..300443389671 100644
--- a/arch/tile/mm/pgtable.c
+++ b/arch/tile/mm/pgtable.c
@@ -338,6 +338,8 @@ pte_t *virt_to_pte(struct mm_struct* mm, unsigned long addr)
pud = pud_offset(pgd, addr);
if (!pud_present(*pud))
return NULL;
+ if (pud_huge_page(*pud))
+ return (pte_t *)pud;
pmd = pmd_offset(pud, addr);
if (pmd_huge_page(*pmd))
return (pte_t *)pmd;
@@ -345,6 +347,7 @@ pte_t *virt_to_pte(struct mm_struct* mm, unsigned long addr)
return NULL;
return pte_offset_kernel(pmd, addr);
}
+EXPORT_SYMBOL(virt_to_pte);
pgprot_t set_remote_cache_cpu(pgprot_t prot, int cpu)
{