Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into sh/urgent

4 files changed, 24 insertions, 25 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 61ba5e405791..ea89840fc65f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -644,7 +644,9 @@ repeat:
         pagep = radix_tree_lookup_slot(&mapping->page_tree, offset);
         if (pagep) {
                 page = radix_tree_deref_slot(pagep);
-                if (unlikely(!page || page == RADIX_TREE_RETRY))
+                if (unlikely(!page))
+                        goto out;
+                if (radix_tree_deref_retry(page))
                         goto repeat;
 
                 if (!page_cache_get_speculative(page))
@@ -660,6 +662,7 @@ repeat:
                         goto repeat;
                 }
         }
+out:
         rcu_read_unlock();
 
         return page;
@@ -777,12 +780,11 @@ repeat:
                 page = radix_tree_deref_slot((void **)pages[i]);
                 if (unlikely(!page))
                         continue;
-                /*
-                 * this can only trigger if nr_found == 1, making livelock
-                 * a non issue.
-                 */
-                if (unlikely(page == RADIX_TREE_RETRY))
+                if (radix_tree_deref_retry(page)) {
+                        if (ret)
+                                start = pages[ret-1]->index;
                         goto restart;
+                }
 
                 if (!page_cache_get_speculative(page))
                         goto repeat;
@@ -830,11 +832,7 @@ repeat:
                 page = radix_tree_deref_slot((void **)pages[i]);
                 if (unlikely(!page))
                         continue;
-                /*
-                 * this can only trigger if nr_found == 1, making livelock
-                 * a non issue.
-                 */
-                if (unlikely(page == RADIX_TREE_RETRY))
+                if (radix_tree_deref_retry(page))
                         goto restart;
 
                 if (page->mapping == NULL || page->index != index)
@@ -887,11 +885,7 @@ repeat:
                 page = radix_tree_deref_slot((void **)pages[i]);
                 if (unlikely(!page))
                         continue;
-                /*
-                 * this can only trigger if nr_found == 1, making livelock
-                 * a non issue.
-                 */
-                if (unlikely(page == RADIX_TREE_RETRY))
+                if (radix_tree_deref_retry(page))
                         goto restart;
 
                 if (!page_cache_get_speculative(page))
@@ -1029,6 +1023,9 @@ find_page:
                                 goto page_not_up_to_date;
                         if (!trylock_page(page))
                                 goto page_not_up_to_date;
+                        /* Did it get truncated before we got the lock? */
+                        if (!page->mapping)
+                                goto page_not_up_to_date_locked;
                         if (!mapping->a_ops->is_partially_uptodate(page,
                                                                 desc, offset))
                                 goto page_not_up_to_date_locked;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9a99cfaf0a19..2efa8ea07ff7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4208,15 +4208,17 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
 
         memset(mem, 0, size);
         mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
-        if (!mem->stat) {
-                if (size < PAGE_SIZE)
-                        kfree(mem);
-                else
-                        vfree(mem);
-                mem = NULL;
-        }
+        if (!mem->stat)
+                goto out_free;
         spin_lock_init(&mem->pcp_counter_lock);
         return mem;
+
+out_free:
+        if (size < PAGE_SIZE)
+                kfree(mem);
+        else
+                vfree(mem);
+        return NULL;
 }
 
 /*
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 2d1bf7cf8851..4c5133873097 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -211,6 +211,7 @@ success:
         mmu_notifier_invalidate_range_end(mm, start, end);
         vm_stat_account(mm, oldflags, vma->vm_file, -nrpages);
         vm_stat_account(mm, newflags, vma->vm_file, nrpages);
+        perf_event_mmap(vma);
         return 0;
 
 fail:
@@ -299,7 +300,6 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
                 error = mprotect_fixup(vma, &prev, nstart, tmp, newflags);
                 if (error)
                         goto out;
-                perf_event_mmap(vma);
                 nstart = tmp;
 
                 if (nstart < prev->vm_end)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b8a6fdc21312..d31d7ce52c0e 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -913,7 +913,7 @@ keep_lumpy:
          * back off and wait for congestion to clear because further reclaim
          * will encounter the same problem
          */
-        if (nr_dirty == nr_congested)
+        if (nr_dirty == nr_congested && nr_dirty != 0)
                 zone_set_flag(zone, ZONE_CONGESTED);
 
         free_page_list(&free_pages);