diff options
| -rw-r--r-- | mm/vmscan.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 2a28170d78e4..d2dc38fd7bec 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -132,13 +132,15 @@ shrink_list(struct list_head *page_list, int nr_pages, zone_t *classzone, goto activate_locked; } + mapping = page->mapping; + /* * Anonymous process memory without backing store. Try to * allocate it some swap space here. * * XXX: implement swap clustering ? */ - if (page->pte.chain && !page->mapping && !PagePrivate(page)) { + if (page->pte.chain && !mapping && !PagePrivate(page)) { pte_chain_unlock(page); if (!add_to_swap(page)) goto activate_locked; @@ -149,7 +151,7 @@ shrink_list(struct list_head *page_list, int nr_pages, zone_t *classzone, * The page is mapped into the page tables of one or more * processes. Try to unmap it here. */ - if (page->pte.chain) { + if (page->pte.chain && mapping) { switch (try_to_unmap(page)) { case SWAP_ERROR: case SWAP_FAIL: @@ -163,7 +165,6 @@ shrink_list(struct list_head *page_list, int nr_pages, zone_t *classzone, } } pte_chain_unlock(page); - mapping = page->mapping; /* * FIXME: this is CPU-inefficient for shared mappings. |