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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2014-04-03 21:48:10 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-03 23:21:03 (GMT)
commit7eae74af32d2048d27c38bad1c767a8f3ce4ddb6 (patch)
treeddfb0e6c207a5fc8dc7dd910dc1f1e06300eadc1 /mm
parent80d7ef66142b0b4358223790e7a4cb153b48a05c (diff)
downloadlinux-7eae74af32d2048d27c38bad1c767a8f3ce4ddb6.tar.xz
mm: do_fault(): extract to call vm_ops->do_fault() to separate function
Extract code to vm_ops->do_fault() and basic error handling to separate function. The code will be reused. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Matthew Wilcox <matthew.r.wilcox@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c76
1 files changed, 45 insertions, 31 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 144e8cd..af76397 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3286,6 +3286,37 @@ oom:
return VM_FAULT_OOM;
}
+static int __do_fault(struct vm_area_struct *vma, unsigned long address,
+ pgoff_t pgoff, unsigned int flags, struct page **page)
+{
+ struct vm_fault vmf;
+ int ret;
+
+ vmf.virtual_address = (void __user *)(address & PAGE_MASK);
+ vmf.pgoff = pgoff;
+ vmf.flags = flags;
+ vmf.page = NULL;
+
+ ret = vma->vm_ops->fault(vma, &vmf);
+ if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
+ return ret;
+
+ if (unlikely(PageHWPoison(vmf.page))) {
+ if (ret & VM_FAULT_LOCKED)
+ unlock_page(vmf.page);
+ page_cache_release(vmf.page);
+ return VM_FAULT_HWPOISON;
+ }
+
+ if (unlikely(!(ret & VM_FAULT_LOCKED)))
+ lock_page(vmf.page);
+ else
+ VM_BUG_ON_PAGE(!PageLocked(vmf.page), vmf.page);
+
+ *page = vmf.page;
+ return ret;
+}
+
/*
* do_fault() tries to create a new page mapping. It aggressively
* tries to share with existing pages, but makes a separate copy if
@@ -3305,12 +3336,11 @@ static int do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
{
pte_t *page_table;
spinlock_t *ptl;
- struct page *page;
+ struct page *page, *fault_page;
struct page *cow_page;
pte_t entry;
int anon = 0;
struct page *dirty_page = NULL;
- struct vm_fault vmf;
int ret;
int page_mkwrite = 0;
@@ -3334,42 +3364,19 @@ static int do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
} else
cow_page = NULL;
- vmf.virtual_address = (void __user *)(address & PAGE_MASK);
- vmf.pgoff = pgoff;
- vmf.flags = flags;
- vmf.page = NULL;
-
- ret = vma->vm_ops->fault(vma, &vmf);
- if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE |
- VM_FAULT_RETRY)))
+ ret = __do_fault(vma, address, pgoff, flags, &fault_page);
+ if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
goto uncharge_out;
- if (unlikely(PageHWPoison(vmf.page))) {
- if (ret & VM_FAULT_LOCKED)
- unlock_page(vmf.page);
- ret = VM_FAULT_HWPOISON;
- page_cache_release(vmf.page);
- goto uncharge_out;
- }
-
- /*
- * For consistency in subsequent calls, make the faulted page always
- * locked.
- */
- if (unlikely(!(ret & VM_FAULT_LOCKED)))
- lock_page(vmf.page);
- else
- VM_BUG_ON_PAGE(!PageLocked(vmf.page), vmf.page);
-
/*
* Should we do an early C-O-W break?
*/
- page = vmf.page;
+ page = fault_page;
if (flags & FAULT_FLAG_WRITE) {
if (!(vma->vm_flags & VM_SHARED)) {
page = cow_page;
anon = 1;
- copy_user_highpage(page, vmf.page, address, vma);
+ copy_user_highpage(page, fault_page, address, vma);
__SetPageUptodate(page);
} else {
/*
@@ -3378,8 +3385,15 @@ static int do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* to become writable
*/
if (vma->vm_ops->page_mkwrite) {
+ struct vm_fault vmf;
int tmp;
+ vmf.virtual_address =
+ (void __user *)(address & PAGE_MASK);
+ vmf.pgoff = pgoff;
+ vmf.flags = flags;
+ vmf.page = fault_page;
+
unlock_page(page);
vmf.flags = FAULT_FLAG_WRITE|FAULT_FLAG_MKWRITE;
tmp = vma->vm_ops->page_mkwrite(vma, &vmf);
@@ -3469,9 +3483,9 @@ static int do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (vma->vm_file && !page_mkwrite)
file_update_time(vma->vm_file);
} else {
- unlock_page(vmf.page);
+ unlock_page(fault_page);
if (anon)
- page_cache_release(vmf.page);
+ page_cache_release(fault_page);
}
return ret;