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revert dabebaedfe

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Pushed from the wrong working directory. Sorry.
This commit is contained in:
Matt Sealey
2010-08-28 15:59:38 -05:00
parent c0455da63c
commit 6f44d7dde0
1 changed files with 0 additions and 37 deletions
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37
mm/memory.c
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@@ -2614,26 +2614,6 @@ out_page:
return ret;
}
/*
* This is like a special single-page "expand_downwards()",
* except we must first make sure that 'address-PAGE_SIZE'
* doesn't hit another vma.
*
* The "find_vma()" will do the right thing even if we wrap
*/
static inline int check_stack_guard_page(struct vm_area_struct *vma, unsigned long address)
{
address &= PAGE_MASK;
if ((vma->vm_flags & VM_GROWSDOWN) && address == vma->vm_start) {
address -= PAGE_SIZE;
if (find_vma(vma->vm_mm, address) != vma)
return -ENOMEM;
expand_stack(vma, address);
}
return 0;
}
/*
* We enter with non-exclusive mmap_sem (to exclude vma changes,
* but allow concurrent faults), and pte mapped but not yet locked.
@@ -2647,22 +2627,6 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
spinlock_t *ptl;
pte_t entry;
pte_unmap(page_table);
/* Check if we need to add a guard page to the stack */
if (check_stack_guard_page(vma, address) < 0)
return VM_FAULT_SIGBUS;
/* Use the zero-page for reads */
if (!(flags & FAULT_FLAG_WRITE)) {
entry = pte_mkspecial(pfn_pte(my_zero_pfn(address),
vma->vm_page_prot));
page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
if (!pte_none(*page_table))
goto unlock;
goto setpte;
}
/* Allocate our own private page. */
if (unlikely(anon_vma_prepare(vma)))
goto oom;
@@ -2683,7 +2647,6 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
goto release;
inc_mm_counter(mm, anon_rss);
page_add_new_anon_rmap(page, vma, address);
setpte:
set_pte_at(mm, address, page_table, entry);
/* No need to invalidate - it was non-present before */