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thp: pte alloc trans splitting

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pte alloc routines must wait for split_huge_page if the pmd is not present
and not null (i.e.  pmd_trans_splitting).  The additional branches are
optimized away at compile time by pmd_trans_splitting if the config option
is off.  However we must pass the vma down in order to know the anon_vma
lock to wait for.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli
2011-01-13 15:46:43 -08:00
committed by Linus Torvalds
parent 64cc6ae001
commit 8ac1f8320a
11 changed files with 35 additions and 23 deletions
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8
mm/mremap.c
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@ -47,7 +47,8 @@ static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr)
return pmd;
}
static pmd_t *alloc_new_pmd(struct mm_struct *mm, unsigned long addr)
static pmd_t *alloc_new_pmd(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr)
{
pgd_t *pgd;
pud_t *pud;
@ -62,7 +63,8 @@ static pmd_t *alloc_new_pmd(struct mm_struct *mm, unsigned long addr)
if (!pmd)
return NULL;
if (!pmd_present(*pmd) && __pte_alloc(mm, pmd, addr))
VM_BUG_ON(pmd_trans_huge(*pmd));
if (pmd_none(*pmd) && __pte_alloc(mm, vma, pmd, addr))
return NULL;
return pmd;
@ -147,7 +149,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma,
old_pmd = get_old_pmd(vma->vm_mm, old_addr);
if (!old_pmd)
continue;
new_pmd = alloc_new_pmd(vma->vm_mm, new_addr);
new_pmd = alloc_new_pmd(vma->vm_mm, vma, new_addr);
if (!new_pmd)
break;
next = (new_addr + PMD_SIZE) & PMD_MASK;