From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Since we're going to have huge pages backed by files,
wait_split_huge_page() has to serialize not only over anon_vma_lock,
but over i_mmap_mutex too.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
include/linux/huge_mm.h | 15 ++++++++++++---
mm/huge_memory.c | 4 ++--
mm/memory.c | 4 ++--
3 files changed, 16 insertions(+), 7 deletions(-)
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index a54939c..b53e295 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -113,11 +113,20 @@ extern void __split_huge_page_pmd(struct vm_area_struct *vma,
__split_huge_page_pmd(__vma, __address, \
____pmd); \
} while (0)
-#define wait_split_huge_page(__anon_vma, __pmd) \
+#define wait_split_huge_page(__vma, __pmd) \
do { \
pmd_t *____pmd = (__pmd); \
- anon_vma_lock_write(__anon_vma); \
- anon_vma_unlock_write(__anon_vma); \
+ struct address_space *__mapping = \
+ vma->vm_file->f_mapping; \
+ struct anon_vma *__anon_vma = (__vma)->anon_vma; \
+ if (__mapping) \
+ mutex_lock(&__mapping->i_mmap_mutex); \
+ if (__anon_vma) { \
+ anon_vma_lock_write(__anon_vma); \
+ anon_vma_unlock_write(__anon_vma); \
+ } \
+ if (__mapping) \
+ mutex_unlock(&__mapping->i_mmap_mutex); \
BUG_ON(pmd_trans_splitting(*____pmd) || \
pmd_trans_huge(*____pmd)); \
} while (0)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index eb777d3..a23da8b 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -907,7 +907,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
spin_unlock(&dst_mm->page_table_lock);
pte_free(dst_mm, pgtable);
- wait_split_huge_page(vma->anon_vma, src_pmd); /* src_vma */
+ wait_split_huge_page(vma, src_pmd); /* src_vma */
goto out;
}
src_page = pmd_page(pmd);
@@ -1480,7 +1480,7 @@ int __pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma)
if (likely(pmd_trans_huge(*pmd))) {
if (unlikely(pmd_trans_splitting(*pmd))) {
spin_unlock(&vma->vm_mm->page_table_lock);
- wait_split_huge_page(vma->anon_vma, pmd);
+ wait_split_huge_page(vma, pmd);
return -1;
} else {
/* Thp mapped by 'pmd' is stable, so we can
diff --git a/mm/memory.c b/mm/memory.c
index 98c25dd..52bd6cf 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -619,7 +619,7 @@ int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
if (new)
pte_free(mm, new);
if (wait_split_huge_page)
- wait_split_huge_page(vma->anon_vma, pmd);
+ wait_split_huge_page(vma, pmd);
return 0;
}
@@ -1529,7 +1529,7 @@ struct page *follow_page_mask(struct vm_area_struct *vma,
if (likely(pmd_trans_huge(*pmd))) {
if (unlikely(pmd_trans_splitting(*pmd))) {
spin_unlock(&mm->page_table_lock);
- wait_split_huge_page(vma->anon_vma, pmd);
+ wait_split_huge_page(vma, pmd);
} else {
page = follow_trans_huge_pmd(vma, address,
pmd, flags);
--
1.7.10.4
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