wp_page_reuse() handles write shared faults which is needed only in
wp_page_shared(). Move the handling only into that location to make
wp_page_reuse() simpler and avoid a strange situation when we sometimes
pass in locked page, sometimes unlocked etc.
Signed-off-by: Jan Kara <j...@suse.cz>
---
mm/memory.c | 27 ++++++++++++---------------
1 file changed, 12 insertions(+), 15 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index 98304eb7bff4..f49e736d6a36 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2099,8 +2099,7 @@ static void fault_dirty_shared_page(struct vm_area_struct
*vma,
* case, all we need to do here is to mark the page as writable and update
* any related book-keeping.
*/
-static inline int wp_page_reuse(struct vm_fault *vmf,
- int page_mkwrite, int dirty_shared)
+static inline void wp_page_reuse(struct vm_fault *vmf)
__releases(vmf->ptl)
{
struct vm_area_struct *vma = vmf->vma;
@@ -2120,16 +2119,6 @@ static inline int wp_page_reuse(struct vm_fault *vmf,
if (ptep_set_access_flags(vma, vmf->address, vmf->pte, entry, 1))
update_mmu_cache(vma, vmf->address, vmf->pte);
pte_unmap_unlock(vmf->pte, vmf->ptl);
-
- if (dirty_shared) {
- if (!page_mkwrite)
- lock_page(page);
-
- fault_dirty_shared_page(vma, page);
- put_page(page);
- }
-
- return VM_FAULT_WRITE;
}
/*
@@ -2304,7 +2293,8 @@ static int wp_pfn_shared(struct vm_fault *vmf)
return 0;
}
}
- return wp_page_reuse(vmf, 0, 0);
+ wp_page_reuse(vmf);
+ return VM_FAULT_WRITE;
}
static int wp_page_shared(struct vm_fault *vmf)
@@ -2342,7 +2332,13 @@ static int wp_page_shared(struct vm_fault *vmf)
page_mkwrite = 1;
}
- return wp_page_reuse(vmf, page_mkwrite, 1);
+ wp_page_reuse(vmf);
+ if (!page_mkwrite)
+ lock_page(vmf->page);
+ fault_dirty_shared_page(vma, vmf->page);
+ put_page(vmf->page);
+
+ return VM_FAULT_WRITE;
}
/*
@@ -2417,7 +2413,8 @@ static int do_wp_page(struct vm_fault *vmf)
page_move_anon_rmap(vmf->page, vma);
}
unlock_page(vmf->page);
- return wp_page_reuse(vmf, 0, 0);
+ wp_page_reuse(vmf);
+ return VM_FAULT_WRITE;
}
unlock_page(vmf->page);
} else if (unlikely((vma->vm_flags & (VM_WRITE|VM_SHARED)) ==
--
2.6.6
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