[PATCH 6/8] badpage: remove vma from page_remove_rmap

Hugh Dickins
2008-12-01T00:45:45Z

Remove page_remove_rmap()'s vma arg, which was only for the Eeek message.
And remove the BUG_ON(page_mapcount(page) == 0) from CONFIG_DEBUG_VM's
page_dup_rmap(): we're trying to be more resilient about that than BUGs.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
---

include/linux/rmap.h | 2 +-
mm/filemap_xip.c | 2 +-
mm/fremap.c | 2 +-
mm/memory.c | 4 ++--
mm/rmap.c | 8 +++-----
5 files changed, 8 insertions(+), 10 deletions(-)

--- badpage5/include/linux/rmap.h 2008-11-26 12:18:59.000000000 +0000
+++ badpage6/include/linux/rmap.h 2008-11-28 20:40:48.000000000 +0000
@@ -69,7 +69,7 @@ void __anon_vma_link(struct vm_area_stru
void page_add_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_new_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
void page_add_file_rmap(struct page *);
-void page_remove_rmap(struct page *, struct vm_area_struct *);
+void page_remove_rmap(struct page *);

#ifdef CONFIG_DEBUG_VM
void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address);
--- badpage5/mm/filemap_xip.c 2008-10-09 23:13:53.000000000 +0100
+++ badpage6/mm/filemap_xip.c 2008-11-28 20:40:48.000000000 +0000
@@ -193,7 +193,7 @@ retry:
/* Nuke the page table entry. */
flush_cache_page(vma, address, pte_pfn(*pte));
pteval = ptep_clear_flush_notify(vma, address, pte);
- page_remove_rmap(page, vma);
+ page_remove_rmap(page);
dec_mm_counter(mm, file_rss);
BUG_ON(pte_dirty(pteval));
pte_unmap_unlock(pte, ptl);
--- badpage5/mm/fremap.c 2008-10-24 09:28:26.000000000 +0100
+++ badpage6/mm/fremap.c 2008-11-28 20:40:48.000000000 +0000
@@ -37,7 +37,7 @@ static void zap_pte(struct mm_struct *mm
if (page) {
if (pte_dirty(pte))
set_page_dirty(page);
- page_remove_rmap(page, vma);
+ page_remove_rmap(page);
page_cache_release(page);
update_hiwater_rss(mm);
dec_mm_counter(mm, file_rss);
--- badpage5/mm/memory.c 2008-11-28 20:40:46.000000000 +0000
+++ badpage6/mm/memory.c 2008-11-28 20:40:48.000000000 +0000
@@ -788,7 +788,7 @@ static unsigned long zap_pte_range(struc
mark_page_accessed(page);
file_rss--;
}
- page_remove_rmap(page, vma);
+ page_remove_rmap(page);
if (unlikely(page_mapcount(page) < 0))
print_bad_pte(vma, addr, ptent, page);
tlb_remove_page(tlb, page);
@@ -1996,7 +1996,7 @@ gotten:
* mapcount is visible. So transitively, TLBs to
* old page will be flushed before it can be reused.
*/
- page_remove_rmap(old_page, vma);
+ page_remove_rmap(old_page);
}

/* Free the old page.. */
--- badpage5/mm/rmap.c 2008-11-28 20:40:40.000000000 +0000
+++ badpage6/mm/rmap.c 2008-11-28 20:40:48.000000000 +0000
@@ -707,7 +707,6 @@ void page_add_file_rmap(struct page *pag
*/
void page_dup_rmap(struct page *page, struct vm_area_struct *vma, unsigned long address)
{
- BUG_ON(page_mapcount(page) == 0);
if (PageAnon(page))
__page_check_anon_rmap(page, vma, address);
atomic_inc(&page->_mapcount);
@@ -717,11 +716,10 @@ void page_dup_rmap(struct page *page, st
/**
* page_remove_rmap - take down pte mapping from a page
* @page: page to remove mapping from
- * @vma: the vm area in which the mapping is removed
*
* The caller needs to hold the pte lock.
*/
-void page_remove_rmap(struct page *page, struct vm_area_struct *vma)
+void page_remove_rmap(struct page *page)
{
if (atomic_add_negative(-1, &page->_mapcount)) {
/*
@@ -837,7 +835,7 @@ static int try_to_unmap_one(struct page
dec_mm_counter(mm, file_rss);

- page_remove_rmap(page, vma);
+ page_remove_rmap(page);
page_cache_release(page);

out_unmap:
@@ -952,7 +950,7 @@ static int try_to_unmap_cluster(unsigned
if (pte_dirty(pteval))
set_page_dirty(page);

- page_remove_rmap(page, vma);
+ page_remove_rmap(page);
page_cache_release(page);
dec_mm_counter(mm, file_rss);
(*mapcount)--;