Subject: + mm-consolidate-code-to-call-vm_ops-page_mkwrite.patch added to -mm tree
To: kirill.shutemov@xxxxxxxxxxxxxxx,ak@xxxxxxxxxxxxxxx,dave.hansen@xxxxxxxxxxxxxxx,matthew.r.wilcox@xxxxxxxxx,mgorman@xxxxxxx,n-horiguchi@xxxxxxxxxxxxx,riel@xxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Mon, 10 Feb 2014 14:54:11 -0800
The patch titled
Subject: mm: consolidate code to call vm_ops->page_mkwrite()
has been added to the -mm tree. Its filename is
mm-consolidate-code-to-call-vm_ops-page_mkwrite.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-consolidate-code-to-call-vm_ops-page_mkwrite.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-consolidate-code-to-call-vm_ops-page_mkwrite.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm: consolidate code to call vm_ops->page_mkwrite()
There are two functions which need to call vm_ops->page_mkwrite():
do_shared_fault() and do_wp_page(). We can consolidate preparation code.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <matthew.r.wilcox@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 104 +++++++++++++++++++++-----------------------------
1 file changed, 44 insertions(+), 60 deletions(-)
diff -puN mm/memory.c~mm-consolidate-code-to-call-vm_ops-page_mkwrite mm/memory.c
--- a/mm/memory.c~mm-consolidate-code-to-call-vm_ops-page_mkwrite
+++ a/mm/memory.c
@@ -2587,6 +2587,37 @@ static inline void cow_user_page(struct
}
/*
+ * Notify the address space that the page is about to become writable so that
+ * it can prohibit this or wait for the page to get into an appropriate state.
+ *
+ * We do this without the lock held, so that it can sleep if it needs to.
+ */
+static int do_page_mkwrite(struct vm_area_struct *vma, struct page *page,
+ unsigned long address)
+{
+ struct vm_fault vmf;
+ int ret;
+
+ vmf.virtual_address = (void __user *)(address & PAGE_MASK);
+ vmf.pgoff = page->index;
+ vmf.flags = FAULT_FLAG_WRITE|FAULT_FLAG_MKWRITE;
+ vmf.page = page;
+
+ ret = vma->vm_ops->page_mkwrite(vma, &vmf);
+ if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
+ return ret;
+ if (unlikely(!(ret & VM_FAULT_LOCKED))) {
+ lock_page(page);
+ if (!page->mapping) {
+ unlock_page(page);
+ return 0; /* retry */
+ }
+ } else
+ VM_BUG_ON_PAGE(!PageLocked(page), page);
+ return ret;
+}
+
+/*
* This routine handles present pages, when users try to write
* to a shared page. It is done by copying the page to a new address
* and decrementing the shared-page counter for the old page.
@@ -2668,42 +2699,15 @@ static int do_wp_page(struct mm_struct *
* get_user_pages(.write=1, .force=1).
*/
if (vma->vm_ops && vma->vm_ops->page_mkwrite) {
- struct vm_fault vmf;
int tmp;
-
- vmf.virtual_address = (void __user *)(address &
- PAGE_MASK);
- vmf.pgoff = old_page->index;
- vmf.flags = FAULT_FLAG_WRITE|FAULT_FLAG_MKWRITE;
- vmf.page = old_page;
-
- /*
- * Notify the address space that the page is about to
- * become writable so that it can prohibit this or wait
- * for the page to get into an appropriate state.
- *
- * We do this without the lock held, so that it can
- * sleep if it needs to.
- */
page_cache_get(old_page);
pte_unmap_unlock(page_table, ptl);
-
- tmp = vma->vm_ops->page_mkwrite(vma, &vmf);
- if (unlikely(tmp &
- (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) {
- ret = tmp;
- goto unwritable_page;
+ tmp = do_page_mkwrite(vma, old_page, address);
+ if (unlikely(!tmp || (tmp &
+ (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
+ page_cache_release(old_page);
+ return tmp;
}
- if (unlikely(!(tmp & VM_FAULT_LOCKED))) {
- lock_page(old_page);
- if (!old_page->mapping) {
- ret = 0; /* retry the fault */
- unlock_page(old_page);
- goto unwritable_page;
- }
- } else
- VM_BUG_ON_PAGE(!PageLocked(old_page), old_page);
-
/*
* Since we dropped the lock we need to revalidate
* the PTE as someone else may have changed it. If
@@ -2892,10 +2896,6 @@ oom:
if (old_page)
page_cache_release(old_page);
return VM_FAULT_OOM;
-
-unwritable_page:
- page_cache_release(old_page);
- return ret;
}
static void unmap_mapping_range_vma(struct vm_area_struct *vma,
@@ -3418,7 +3418,6 @@ static int do_shared_fault(struct mm_str
spinlock_t *ptl;
pte_t entry, *pte;
int dirtied = 0;
- struct vm_fault vmf;
int ret, tmp;
ret = __do_fault(vma, address, pgoff, flags, &fault_page);
@@ -3429,31 +3428,16 @@ static int do_shared_fault(struct mm_str
* Check if the backing address space wants to know that the page is
* about to become writable
*/
- if (!vma->vm_ops->page_mkwrite)
- goto set_pte;
-
- unlock_page(fault_page);
- vmf.virtual_address = (void __user *)(address & PAGE_MASK);
- vmf.pgoff = pgoff;
- vmf.flags = FAULT_FLAG_WRITE|FAULT_FLAG_MKWRITE;
- vmf.page = fault_page;
-
- tmp = vma->vm_ops->page_mkwrite(vma, &vmf);
- if (unlikely(tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) {
- page_cache_release(fault_page);
- return tmp;
- }
-
- if (unlikely(!(tmp & VM_FAULT_LOCKED))) {
- lock_page(fault_page);
- if (!fault_page->mapping) {
- unlock_page(fault_page);
+ if (vma->vm_ops->page_mkwrite) {
+ unlock_page(fault_page);
+ tmp = do_page_mkwrite(vma, fault_page, address);
+ if (unlikely(!tmp ||
+ (tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
page_cache_release(fault_page);
- return 0; /* retry */
+ return tmp;
}
- } else
- VM_BUG_ON_PAGE(!PageLocked(fault_page), fault_page);
-set_pte:
+ }
+
pte = pte_offset_map_lock(mm, pmd, address, &ptl);
if (unlikely(!pte_same(*pte, orig_pte))) {
pte_unmap_unlock(pte, ptl);
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
pagewalk-update-page-table-walker-core.patch
pagewalk-add-walk_page_vma.patch
smaps-redefine-callback-functions-for-page-table-walker.patch
clear_refs-redefine-callback-functions-for-page-table-walker.patch
pagemap-redefine-callback-functions-for-page-table-walker.patch
numa_maps-redefine-callback-functions-for-page-table-walker.patch
memcg-redefine-callback-functions-for-page-table-walker.patch
madvise-redefine-callback-functions-for-page-table-walker.patch
arch-powerpc-mm-subpage-protc-use-walk_page_vma-instead-of-walk_page_range.patch
pagewalk-remove-argument-hmask-from-hugetlb_entry.patch
mempolicy-apply-page-table-walker-on-queue_pages_range.patch
mm-hwpoison-release-page-on-pagehwpoison-in-__do_fault.patch
mm-rename-__do_fault-do_fault.patch
mm-do_fault-extract-to-call-vm_ops-do_fault-to-separate-function.patch
mm-introduce-do_read_fault.patch
mm-introduce-do_cow_fault.patch
mm-introduce-do_shared_fault-and-drop-do_fault.patch
mm-consolidate-code-to-call-vm_ops-page_mkwrite.patch
mm-consolidate-code-to-setup-pte.patch
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