tile: fix some issues in hugepage support

First, in huge_pte_offset(), we were erroneously checking
pgd_present(), which is always true, rather than pud_present(),
which is the thing that tells us if there is a top-level (L0) PTE.
Fixing this means we properly look up huge page entries only when
the Present bit is actually set in the PTE.

Second, use the standard pte_alloc_map() instead of the hand-rolled
pte_alloc_hugetlb() routine that basically was written to avoid
worrying about CONFIG_HIGHPTE.  However, we no longer plan to support
HIGHPTE, so a separate routine was just unnecessary code duplication.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/mm/hugetlbpage.c b/arch/tile/mm/hugetlbpage.c
index 650ccff..e514899 100644 (file)
--- a/arch/tile/mm/hugetlbpage.c
+++ b/arch/tile/mm/hugetlbpage.c
@@ -49,38 +49,6 @@ int huge_shift[HUGE_SHIFT_ENTRIES] = {
 #endif
 };
 
-/*
- * This routine is a hybrid of pte_alloc_map() and pte_alloc_kernel().
- * It assumes that L2 PTEs are never in HIGHMEM (we don't support that).
- * It locks the user pagetable, and bumps up the mm->nr_ptes field,
- * but otherwise allocate the page table using the kernel versions.
- */
-static pte_t *pte_alloc_hugetlb(struct mm_struct *mm, pmd_t *pmd,
-                               unsigned long address)
-{
-       pte_t *new;
-
-       if (pmd_none(*pmd)) {
-               new = pte_alloc_one_kernel(mm, address);
-               if (!new)
-                       return NULL;
-
-               smp_wmb(); /* See comment in __pte_alloc */
-
-               spin_lock(&mm->page_table_lock);
-               if (likely(pmd_none(*pmd))) {  /* Has another populated it ? */
-                       mm->nr_ptes++;
-                       pmd_populate_kernel(mm, pmd, new);
-                       new = NULL;
-               } else
-                       VM_BUG_ON(pmd_trans_splitting(*pmd));
-               spin_unlock(&mm->page_table_lock);
-               if (new)
-                       pte_free_kernel(mm, new);
-       }
-
-       return pte_offset_kernel(pmd, address);
-}
 #endif
 
 pte_t *huge_pte_alloc(struct mm_struct *mm,
@@ -109,7 +77,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
                else {
                        if (sz != PAGE_SIZE << huge_shift[HUGE_SHIFT_PAGE])
                                panic("Unexpected page size %#lx\n", sz);
-                       return pte_alloc_hugetlb(mm, pmd, addr);
+                       return pte_alloc_map(mm, NULL, pmd, addr);
                }
        }
 #else
@@ -144,14 +112,14 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
 
        /* Get the top-level page table entry. */
        pgd = (pgd_t *)get_pte((pte_t *)mm->pgd, pgd_index(addr), 0);
-       if (!pgd_present(*pgd))
-               return NULL;
 
        /* We don't have four levels. */
        pud = pud_offset(pgd, addr);
 #ifndef __PAGETABLE_PUD_FOLDED
 # error support fourth page table level
 #endif
+       if (!pud_present(*pud))
+               return NULL;
 
        /* Check for an L0 huge PTE, if we have three levels. */
 #ifndef __PAGETABLE_PMD_FOLDED