8 files changed, 76 insertions, 53 deletions

diff --git a/mm/Kconfig b/mm/Kconfig
index c948d4ca8bde..fe5f674d7a7d 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -225,9 +225,9 @@ config DEFAULT_MMAP_MIN_ADDR
           For most ia64, ppc64 and x86 users with lots of address space
           a value of 65536 is reasonable and should cause no problems.
           On arm and other archs it should not be higher than 32768.
-          Programs which use vm86 functionality would either need additional
-          permissions from either the LSM or the capabilities module or have
-          this protection disabled.
+          Programs which use vm86 functionality or have some need to map
+          this low address space will need CAP_SYS_RAWIO or disable this
+          protection by setting the value to 0.
 
           This value can be changed after boot using the
           /proc/sys/vm/mmap_min_addr tunable.
diff --git a/mm/mmap.c b/mm/mmap.c
index 34579b23ebd5..8101de490c73 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -88,9 +88,6 @@ int sysctl_overcommit_ratio = 50;	/* default is 50% */
 int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;
 struct percpu_counter vm_committed_as;
 
-/* amount of vm to protect from userspace access */
-unsigned long mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR;
-
 /*
  * Check that a process has enough memory to allocate a new virtual
  * mapping. 0 means there is enough memory for the allocation to
diff --git a/mm/nommu.c b/mm/nommu.c
index 53cab10fece4..4bde489ec431 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -69,9 +69,6 @@ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT;
 int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS;
 int heap_stack_gap = 0;
 
-/* amount of vm to protect from userspace access */
-unsigned long mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR;
-
 atomic_long_t mmap_pages_allocated;
 
 EXPORT_SYMBOL(mem_map);
@@ -922,6 +919,10 @@ static int validate_mmap_request(struct file *file,
                 if (!file->f_op->read)
                         capabilities &= ~BDI_CAP_MAP_COPY;
 
+                /* The file shall have been opened with read permission. */
+                if (!(file->f_mode & FMODE_READ))
+                        return -EACCES;
+
                 if (flags & MAP_SHARED) {
                         /* do checks for writing, appending and locking */
                         if ((prot & PROT_WRITE) &&
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 175a67a78a99..a7b2460e922b 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -58,7 +58,6 @@ unsigned long badness(struct task_struct *p, unsigned long uptime)
         unsigned long points, cpu_time, run_time;
         struct mm_struct *mm;
         struct task_struct *child;
-        int oom_adj;
 
         task_lock(p);
         mm = p->mm;
@@ -66,11 +65,6 @@ unsigned long badness(struct task_struct *p, unsigned long uptime)
                 task_unlock(p);
                 return 0;
         }
-        oom_adj = mm->oom_adj;
-        if (oom_adj == OOM_DISABLE) {
-                task_unlock(p);
-                return 0;
-        }
 
         /*
          * The memory size of the process is the basis for the badness.
@@ -154,15 +148,15 @@ unsigned long badness(struct task_struct *p, unsigned long uptime)
                 points /= 8;
 
         /*
-         * Adjust the score by oom_adj.
+         * Adjust the score by oomkilladj.
          */
-        if (oom_adj) {
-                if (oom_adj > 0) {
+        if (p->oomkilladj) {
+                if (p->oomkilladj > 0) {
                         if (!points)
                                 points = 1;
-                        points <<= oom_adj;
+                        points <<= p->oomkilladj;
                 } else
-                        points >>= -(oom_adj);
+                        points >>= -(p->oomkilladj);
         }
 
 #ifdef DEBUG
@@ -257,8 +251,11 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
                         *ppoints = ULONG_MAX;
                 }
 
+                if (p->oomkilladj == OOM_DISABLE)
+                        continue;
+
                 points = badness(p, uptime.tv_sec);
-                if (points > *ppoints) {
+                if (points > *ppoints || !chosen) {
                         chosen = p;
                         *ppoints = points;
                 }
@@ -307,7 +304,8 @@ static void dump_tasks(const struct mem_cgroup *mem)
                 }
                 printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d     %3d %s\n",
                        p->pid, __task_cred(p)->uid, p->tgid, mm->total_vm,
-                       get_mm_rss(mm), (int)task_cpu(p), mm->oom_adj, p->comm);
+                       get_mm_rss(mm), (int)task_cpu(p), p->oomkilladj,
+                       p->comm);
                 task_unlock(p);
         } while_each_thread(g, p);
 }
@@ -325,8 +323,11 @@ static void __oom_kill_task(struct task_struct *p, int verbose)
                 return;
         }
 
-        if (!p->mm)
+        if (!p->mm) {
+                WARN_ON(1);
+                printk(KERN_WARNING "tried to kill an mm-less task!\n");
                 return;
+        }
 
         if (verbose)
                 printk(KERN_ERR "Killed process %d (%s)\n",
@@ -348,13 +349,28 @@ static int oom_kill_task(struct task_struct *p)
         struct mm_struct *mm;
         struct task_struct *g, *q;
 
-        task_lock(p);
         mm = p->mm;
-        if (!mm || mm->oom_adj == OOM_DISABLE) {
-                task_unlock(p);
+
+        /* WARNING: mm may not be dereferenced since we did not obtain its
+         * value from get_task_mm(p).  This is OK since all we need to do is
+         * compare mm to q->mm below.
+         *
+         * Furthermore, even if mm contains a non-NULL value, p->mm may
+         * change to NULL at any time since we do not hold task_lock(p).
+         * However, this is of no concern to us.
+         */
+
+        if (mm == NULL)
                 return 1;
-        }
-        task_unlock(p);
+
+        /*
+         * Don't kill the process if any threads are set to OOM_DISABLE
+         */
+        do_each_thread(g, q) {
+                if (q->mm == mm && q->oomkilladj == OOM_DISABLE)
+                        return 1;
+        } while_each_thread(g, q);
+
         __oom_kill_task(p, 1);
 
         /*
@@ -377,11 +393,10 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
         struct task_struct *c;
 
         if (printk_ratelimit()) {
-                task_lock(current);
                 printk(KERN_WARNING "%s invoked oom-killer: "
-                        "gfp_mask=0x%x, order=%d, oom_adj=%d\n",
-                        current->comm, gfp_mask, order,
-                        current->mm ? current->mm->oom_adj : OOM_DISABLE);
+                        "gfp_mask=0x%x, order=%d, oomkilladj=%d\n",
+                        current->comm, gfp_mask, order, current->oomkilladj);
+                task_lock(current);
                 cpuset_print_task_mems_allowed(current);
                 task_unlock(current);
                 dump_stack();
@@ -394,9 +409,8 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
         /*
          * If the task is already exiting, don't alarm the sysadmin or kill
          * its children or threads, just set TIF_MEMDIE so it can die quickly
-         * if its mm is still attached.
          */
-        if (p->mm && (p->flags & PF_EXITING)) {
+        if (p->flags & PF_EXITING) {
                 __oom_kill_task(p, 0);
                 return 0;
         }
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d052abbe3063..5cc986eb9f6f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2544,7 +2544,6 @@ static void build_zonelists(pg_data_t *pgdat)
         prev_node = local_node;
         nodes_clear(used_mask);
 
-        memset(node_load, 0, sizeof(node_load));
         memset(node_order, 0, sizeof(node_order));
         j = 0;
 
@@ -2653,6 +2652,9 @@ static int __build_all_zonelists(void *dummy)
 {
         int nid;
 
+#ifdef CONFIG_NUMA
+        memset(node_load, 0, sizeof(node_load));
+#endif
         for_each_online_node(nid) {
                 pg_data_t *pgdat = NODE_DATA(nid);
 
diff --git a/mm/percpu.c b/mm/percpu.c
index b70f2acd8853..5fe37842e0ea 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -8,12 +8,12 @@
  *
  * This is percpu allocator which can handle both static and dynamic
  * areas.  Percpu areas are allocated in chunks in vmalloc area.  Each
- * chunk is consisted of num_possible_cpus() units and the first chunk
- * is used for static percpu variables in the kernel image (special
- * boot time alloc/init handling necessary as these areas need to be
- * brought up before allocation services are running).  Unit grows as
- * necessary and all units grow or shrink in unison.  When a chunk is
- * filled up, another chunk is allocated.  ie. in vmalloc area
+ * chunk is consisted of nr_cpu_ids units and the first chunk is used
+ * for static percpu variables in the kernel image (special boot time
+ * alloc/init handling necessary as these areas need to be brought up
+ * before allocation services are running).  Unit grows as necessary
+ * and all units grow or shrink in unison.  When a chunk is filled up,
+ * another chunk is allocated.  ie. in vmalloc area
  *
  *  c0                           c1                         c2
  *  -------------------          -------------------        ------------
@@ -558,7 +558,7 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int freeme)
 static void pcpu_unmap(struct pcpu_chunk *chunk, int page_start, int page_end,
                        bool flush_tlb)
 {
-        unsigned int last = num_possible_cpus() - 1;
+        unsigned int last = nr_cpu_ids - 1;
         unsigned int cpu;
 
         /* unmap must not be done on immutable chunk */
@@ -643,7 +643,7 @@ static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk, int off, int size,
  */
 static int pcpu_map(struct pcpu_chunk *chunk, int page_start, int page_end)
 {
-        unsigned int last = num_possible_cpus() - 1;
+        unsigned int last = nr_cpu_ids - 1;
         unsigned int cpu;
         int err;
 
@@ -749,7 +749,7 @@ static struct pcpu_chunk *alloc_pcpu_chunk(void)
         chunk->map[chunk->map_used++] = pcpu_unit_size;
         chunk->page = chunk->page_ar;
 
-        chunk->vm = get_vm_area(pcpu_chunk_size, GFP_KERNEL);
+        chunk->vm = get_vm_area(pcpu_chunk_size, VM_ALLOC);
         if (!chunk->vm) {
                 free_pcpu_chunk(chunk);
                 return NULL;
@@ -1067,9 +1067,9 @@ size_t __init pcpu_setup_first_chunk(pcpu_get_page_fn_t get_page_fn,
                                         PFN_UP(size_sum));
 
         pcpu_unit_size = pcpu_unit_pages << PAGE_SHIFT;
-        pcpu_chunk_size = num_possible_cpus() * pcpu_unit_size;
+        pcpu_chunk_size = nr_cpu_ids * pcpu_unit_size;
         pcpu_chunk_struct_size = sizeof(struct pcpu_chunk)
-                + num_possible_cpus() * pcpu_unit_pages * sizeof(struct page *);
+                + nr_cpu_ids * pcpu_unit_pages * sizeof(struct page *);
 
         if (dyn_size < 0)
                 dyn_size = pcpu_unit_size - static_size - reserved_size;
@@ -1248,7 +1248,7 @@ ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
         } else
                 pcpue_unit_size = max_t(size_t, pcpue_size, PCPU_MIN_UNIT_SIZE);
 
-        chunk_size = pcpue_unit_size * num_possible_cpus();
+        chunk_size = pcpue_unit_size * nr_cpu_ids;
 
         pcpue_ptr = __alloc_bootmem_nopanic(chunk_size, PAGE_SIZE,
                                             __pa(MAX_DMA_ADDRESS));
@@ -1259,12 +1259,15 @@ ssize_t __init pcpu_embed_first_chunk(size_t static_size, size_t reserved_size,
         }
 
         /* return the leftover and copy */
-        for_each_possible_cpu(cpu) {
+        for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
                 void *ptr = pcpue_ptr + cpu * pcpue_unit_size;
 
-                free_bootmem(__pa(ptr + pcpue_size),
-                             pcpue_unit_size - pcpue_size);
-                memcpy(ptr, __per_cpu_load, static_size);
+                if (cpu_possible(cpu)) {
+                        free_bootmem(__pa(ptr + pcpue_size),
+                                     pcpue_unit_size - pcpue_size);
+                        memcpy(ptr, __per_cpu_load, static_size);
+                } else
+                        free_bootmem(__pa(ptr), pcpue_unit_size);
         }
 
         /* we're ready, commit */
diff --git a/mm/rmap.c b/mm/rmap.c
index 836c6c63e1f2..0895b5c7cbff 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -358,6 +358,7 @@ static int page_referenced_one(struct page *page,
          */
         if (vma->vm_flags & VM_LOCKED) {
                 *mapcount = 1;  /* break early from loop */
+                *vm_flags |= VM_LOCKED;
                 goto out_unmap;
         }
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index dea7abd31098..94e86dd6954c 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -630,9 +630,14 @@ static unsigned long shrink_page_list(struct list_head *page_list,
 
                 referenced = page_referenced(page, 1,
                                                 sc->mem_cgroup, &vm_flags);
-                /* In active use or really unfreeable?  Activate it. */
+                /*
+                 * In active use or really unfreeable?  Activate it.
+                 * If page which have PG_mlocked lost isoltation race,
+                 * try_to_unmap moves it to unevictable list
+                 */
                 if (sc->order <= PAGE_ALLOC_COSTLY_ORDER &&
-                                        referenced && page_mapping_inuse(page))
+                                        referenced && page_mapping_inuse(page)
+                                        && !(vm_flags & VM_LOCKED))
                         goto activate_locked;
 
                 /*