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Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c60
1 files changed, 27 insertions, 33 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 692ad810263d..95a4553c75f7 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -307,28 +307,22 @@ out:
return pte_offset_map(pmd, address);
}
-pte_t fastcall * pte_alloc_kernel(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
+pte_t fastcall * pte_alloc_kernel(pmd_t *pmd, unsigned long address)
{
if (!pmd_present(*pmd)) {
pte_t *new;
- spin_unlock(&mm->page_table_lock);
- new = pte_alloc_one_kernel(mm, address);
- spin_lock(&mm->page_table_lock);
+ new = pte_alloc_one_kernel(&init_mm, address);
if (!new)
return NULL;
- /*
- * Because we dropped the lock, we should re-check the
- * entry, as somebody else could have populated it..
- */
- if (pmd_present(*pmd)) {
+ spin_lock(&init_mm.page_table_lock);
+ if (pmd_present(*pmd))
pte_free_kernel(new);
- goto out;
- }
- pmd_populate_kernel(mm, pmd, new);
+ else
+ pmd_populate_kernel(&init_mm, pmd, new);
+ spin_unlock(&init_mm.page_table_lock);
}
-out:
return pte_offset_kernel(pmd, address);
}
@@ -2097,30 +2091,30 @@ int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
#ifndef __PAGETABLE_PUD_FOLDED
/*
* Allocate page upper directory.
- *
- * We've already handled the fast-path in-line, and we own the
- * page table lock.
+ * We've already handled the fast-path in-line.
*/
pud_t fastcall *__pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address)
{
pud_t *new;
- spin_unlock(&mm->page_table_lock);
+ if (mm != &init_mm) /* Temporary bridging hack */
+ spin_unlock(&mm->page_table_lock);
new = pud_alloc_one(mm, address);
- spin_lock(&mm->page_table_lock);
- if (!new)
+ if (!new) {
+ if (mm != &init_mm) /* Temporary bridging hack */
+ spin_lock(&mm->page_table_lock);
return NULL;
+ }
- /*
- * Because we dropped the lock, we should re-check the
- * entry, as somebody else could have populated it..
- */
+ spin_lock(&mm->page_table_lock);
if (pgd_present(*pgd)) {
pud_free(new);
goto out;
}
pgd_populate(mm, pgd, new);
out:
+ if (mm == &init_mm) /* Temporary bridging hack */
+ spin_unlock(&mm->page_table_lock);
return pud_offset(pgd, address);
}
#endif /* __PAGETABLE_PUD_FOLDED */
@@ -2128,24 +2122,22 @@ pud_t fastcall *__pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long addr
#ifndef __PAGETABLE_PMD_FOLDED
/*
* Allocate page middle directory.
- *
- * We've already handled the fast-path in-line, and we own the
- * page table lock.
+ * We've already handled the fast-path in-line.
*/
pmd_t fastcall *__pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
{
pmd_t *new;
- spin_unlock(&mm->page_table_lock);
+ if (mm != &init_mm) /* Temporary bridging hack */
+ spin_unlock(&mm->page_table_lock);
new = pmd_alloc_one(mm, address);
- spin_lock(&mm->page_table_lock);
- if (!new)
+ if (!new) {
+ if (mm != &init_mm) /* Temporary bridging hack */
+ spin_lock(&mm->page_table_lock);
return NULL;
+ }
- /*
- * Because we dropped the lock, we should re-check the
- * entry, as somebody else could have populated it..
- */
+ spin_lock(&mm->page_table_lock);
#ifndef __ARCH_HAS_4LEVEL_HACK
if (pud_present(*pud)) {
pmd_free(new);
@@ -2161,6 +2153,8 @@ pmd_t fastcall *__pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr
#endif /* __ARCH_HAS_4LEVEL_HACK */
out:
+ if (mm == &init_mm) /* Temporary bridging hack */
+ spin_unlock(&mm->page_table_lock);
return pmd_offset(pud, address);
}
#endif /* __PAGETABLE_PMD_FOLDED */