ath5k: fix NULL pointer in antenna configuration

[safe/jmp/linux-2.6] / mm / ksm.c

diff --git a/mm/ksm.c b/mm/ksm.c
index d4c228a..956880f 100644 (file)
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -179,9 +179,6 @@ static unsigned long ksm_pages_unshared;
 /* The number of rmap_items in use: to calculate pages_volatile */
 static unsigned long ksm_rmap_items;
 
-/* Limit on the number of unswappable pages used */
-static unsigned long ksm_max_kernel_pages;
-
 /* Number of pages ksmd should scan in one batch */
 static unsigned int ksm_thread_pages_to_scan = 100;
 
@@ -368,7 +365,7 @@ static int break_ksm(struct vm_area_struct *vma, unsigned long addr)
        do {
                cond_resched();
                page = follow_page(vma, addr, FOLL_GET);
-               if (!page)
+               if (IS_ERR_OR_NULL(page))
                        break;
                if (PageKsm(page))
                        ret = handle_mm_fault(vma->vm_mm, vma, addr,
@@ -450,7 +447,7 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item)
                goto out;
 
        page = follow_page(vma, addr, FOLL_GET);
-       if (!page)
+       if (IS_ERR_OR_NULL(page))
                goto out;
        if (PageAnon(page)) {
                flush_anon_page(vma, page, addr);
@@ -754,7 +751,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
                 * page
                 */
                if (page_mapcount(page) + 1 + swapped != page_count(page)) {
-                       set_pte_at_notify(mm, addr, ptep, entry);
+                       set_pte_at(mm, addr, ptep, entry);
                        goto out_unlock;
                }
                entry = pte_wrprotect(entry);
@@ -943,14 +940,6 @@ static struct page *try_to_merge_two_pages(struct rmap_item *rmap_item,
 {
        int err;
 
-       /*
-        * The number of nodes in the stable tree
-        * is the number of kernel pages that we hold.
-        */
-       if (ksm_max_kernel_pages &&
-           ksm_max_kernel_pages <= ksm_pages_shared)
-               return NULL;
-
        err = try_to_merge_with_ksm_page(rmap_item, page, NULL);
        if (!err) {
                err = try_to_merge_with_ksm_page(tree_rmap_item,
@@ -1097,7 +1086,7 @@ struct rmap_item *unstable_tree_search_insert(struct rmap_item *rmap_item,
                cond_resched();
                tree_rmap_item = rb_entry(*new, struct rmap_item, node);
                tree_page = get_mergeable_page(tree_rmap_item);
-               if (!tree_page)
+               if (IS_ERR_OR_NULL(tree_page))
                        return NULL;
 
                /*
@@ -1305,7 +1294,7 @@ next_mm:
                        if (ksm_test_exit(mm))
                                break;
                        *page = follow_page(vma, ksm_scan.address, FOLL_GET);
-                       if (*page && PageAnon(*page)) {
+                       if (!IS_ERR_OR_NULL(*page) && PageAnon(*page)) {
                                flush_anon_page(vma, *page, ksm_scan.address);
                                flush_dcache_page(*page);
                                rmap_item = get_next_rmap_item(slot,
@@ -1319,7 +1308,7 @@ next_mm:
                                up_read(&mm->mmap_sem);
                                return rmap_item;
                        }
-                       if (*page)
+                       if (!IS_ERR_OR_NULL(*page))
                                put_page(*page);
                        ksm_scan.address += PAGE_SIZE;
                        cond_resched();
@@ -1378,7 +1367,7 @@ next_mm:
 static void ksm_do_scan(unsigned int scan_npages)
 {
        struct rmap_item *rmap_item;
-       struct page *page;
+       struct page *uninitialized_var(page);
 
        while (scan_npages--) {
                cond_resched();
@@ -1574,10 +1563,12 @@ int page_referenced_ksm(struct page *page, struct mem_cgroup *memcg,
 again:
        hlist_for_each_entry(rmap_item, hlist, &stable_node->hlist, hlist) {
                struct anon_vma *anon_vma = rmap_item->anon_vma;
+               struct anon_vma_chain *vmac;
                struct vm_area_struct *vma;
 
                spin_lock(&anon_vma->lock);
-               list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
+               list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
+                       vma = vmac->vma;
                        if (rmap_item->address < vma->vm_start ||
                            rmap_item->address >= vma->vm_end)
                                continue;
@@ -1625,10 +1616,12 @@ int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
 again:
        hlist_for_each_entry(rmap_item, hlist, &stable_node->hlist, hlist) {
                struct anon_vma *anon_vma = rmap_item->anon_vma;
+               struct anon_vma_chain *vmac;
                struct vm_area_struct *vma;
 
                spin_lock(&anon_vma->lock);
-               list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
+               list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
+                       vma = vmac->vma;
                        if (rmap_item->address < vma->vm_start ||
                            rmap_item->address >= vma->vm_end)
                                continue;
@@ -1675,10 +1668,12 @@ int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
 again:
        hlist_for_each_entry(rmap_item, hlist, &stable_node->hlist, hlist) {
                struct anon_vma *anon_vma = rmap_item->anon_vma;
+               struct anon_vma_chain *vmac;
                struct vm_area_struct *vma;
 
                spin_lock(&anon_vma->lock);
-               list_for_each_entry(vma, &anon_vma->head, anon_vma_node) {
+               list_for_each_entry(vmac, &anon_vma->head, same_anon_vma) {
+                       vma = vmac->vma;
                        if (rmap_item->address < vma->vm_start ||
                            rmap_item->address >= vma->vm_end)
                                continue;
@@ -1850,8 +1845,8 @@ static ssize_t run_store(struct kobject *kobj, struct kobj_attribute *attr,
        /*
         * KSM_RUN_MERGE sets ksmd running, and 0 stops it running.
         * KSM_RUN_UNMERGE stops it running and unmerges all rmap_items,
-        * breaking COW to free the unswappable pages_shared (but leaves
-        * mm_slots on the list for when ksmd may be set running again).
+        * breaking COW to free the pages_shared (but leaves mm_slots
+        * on the list for when ksmd may be set running again).
         */
 
        mutex_lock(&ksm_thread_mutex);
@@ -1876,29 +1871,6 @@ static ssize_t run_store(struct kobject *kobj, struct kobj_attribute *attr,
 }
 KSM_ATTR(run);
 
-static ssize_t max_kernel_pages_store(struct kobject *kobj,
-                                     struct kobj_attribute *attr,
-                                     const char *buf, size_t count)
-{
-       int err;
-       unsigned long nr_pages;
-
-       err = strict_strtoul(buf, 10, &nr_pages);
-       if (err)
-               return -EINVAL;
-
-       ksm_max_kernel_pages = nr_pages;
-
-       return count;
-}
-
-static ssize_t max_kernel_pages_show(struct kobject *kobj,
-                                    struct kobj_attribute *attr, char *buf)
-{
-       return sprintf(buf, "%lu\n", ksm_max_kernel_pages);
-}
-KSM_ATTR(max_kernel_pages);
-
 static ssize_t pages_shared_show(struct kobject *kobj,
                                 struct kobj_attribute *attr, char *buf)
 {
@@ -1948,7 +1920,6 @@ static struct attribute *ksm_attrs[] = {
        &sleep_millisecs_attr.attr,
        &pages_to_scan_attr.attr,
        &run_attr.attr,
-       &max_kernel_pages_attr.attr,
        &pages_shared_attr.attr,
        &pages_sharing_attr.attr,
        &pages_unshared_attr.attr,
@@ -1968,8 +1939,6 @@ static int __init ksm_init(void)
        struct task_struct *ksm_thread;
        int err;
 
-       ksm_max_kernel_pages = totalram_pages / 4;
-
        err = ksm_slab_init();
        if (err)
                goto out;