memcg: cleanup cache_charge

[sfrench/cifs-2.6.git] / mm / nommu.c

diff --git a/mm/nommu.c b/mm/nommu.c
index 2fcf47d449b4e203d46bbbf76827aeedbd2e2c22..72eda4aee2cb46d72e070271d82ae13daef78b36 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -69,7 +69,7 @@ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT;
 int sysctl_nr_trim_pages = 1; /* page trimming behaviour */
 int heap_stack_gap = 0;
 
-atomic_t mmap_pages_allocated;
+atomic_long_t mmap_pages_allocated;
 
 EXPORT_SYMBOL(mem_map);
 EXPORT_SYMBOL(num_physpages);
@@ -463,12 +463,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
  */
 void __init mmap_init(void)
 {
-       vm_region_jar = kmem_cache_create("vm_region_jar",
-                                         sizeof(struct vm_region), 0,
-                                         SLAB_PANIC, NULL);
-       vm_area_cachep = kmem_cache_create("vm_area_struct",
-                                          sizeof(struct vm_area_struct), 0,
-                                          SLAB_PANIC, NULL);
+       vm_region_jar = KMEM_CACHE(vm_region, SLAB_PANIC);
 }
 
 /*
@@ -486,27 +481,24 @@ static noinline void validate_nommu_regions(void)
                return;
 
        last = rb_entry(lastp, struct vm_region, vm_rb);
-       if (unlikely(last->vm_end <= last->vm_start))
-               BUG();
-       if (unlikely(last->vm_top < last->vm_end))
-               BUG();
+       BUG_ON(unlikely(last->vm_end <= last->vm_start));
+       BUG_ON(unlikely(last->vm_top < last->vm_end));
 
        while ((p = rb_next(lastp))) {
                region = rb_entry(p, struct vm_region, vm_rb);
                last = rb_entry(lastp, struct vm_region, vm_rb);
 
-               if (unlikely(region->vm_end <= region->vm_start))
-                       BUG();
-               if (unlikely(region->vm_top < region->vm_end))
-                       BUG();
-               if (unlikely(region->vm_start < last->vm_top))
-                       BUG();
+               BUG_ON(unlikely(region->vm_end <= region->vm_start));
+               BUG_ON(unlikely(region->vm_top < region->vm_end));
+               BUG_ON(unlikely(region->vm_start < last->vm_top));
 
                lastp = p;
        }
 }
 #else
-#define validate_nommu_regions() do {} while(0)
+static void validate_nommu_regions(void)
+{
+}
 #endif
 
 /*
@@ -563,16 +555,17 @@ static void free_page_series(unsigned long from, unsigned long to)
                struct page *page = virt_to_page(from);
 
                kdebug("- free %lx", from);
-               atomic_dec(&mmap_pages_allocated);
+               atomic_long_dec(&mmap_pages_allocated);
                if (page_count(page) != 1)
-                       kdebug("free page %p [%d]", page, page_count(page));
+                       kdebug("free page %p: refcount not one: %d",
+                              page, page_count(page));
                put_page(page);
        }
 }
 
 /*
  * release a reference to a region
- * - the caller must hold the region semaphore, which this releases
+ * - the caller must hold the region semaphore for writing, which this releases
  * - the region may not have been added to the tree yet, in which case vm_top
  *   will equal vm_start
  */
@@ -1096,7 +1089,7 @@ static int do_mmap_private(struct vm_area_struct *vma,
                goto enomem;
 
        total = 1 << order;
-       atomic_add(total, &mmap_pages_allocated);
+       atomic_long_add(total, &mmap_pages_allocated);
 
        point = rlen >> PAGE_SHIFT;
 
@@ -1107,7 +1100,7 @@ static int do_mmap_private(struct vm_area_struct *vma,
                        order = ilog2(total - point);
                        n = 1 << order;
                        kdebug("shave %lu/%lu @%lu", n, total - point, total);
-                       atomic_sub(n, &mmap_pages_allocated);
+                       atomic_long_sub(n, &mmap_pages_allocated);
                        total -= n;
                        set_page_refcounted(pages + total);
                        __free_pages(pages + total, order);
@@ -1536,10 +1529,15 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
        /* find the first potentially overlapping VMA */
        vma = find_vma(mm, start);
        if (!vma) {
-               printk(KERN_WARNING
-                      "munmap of memory not mmapped by process %d (%s):"
-                      " 0x%lx-0x%lx\n",
-                      current->pid, current->comm, start, start + len - 1);
+               static int limit = 0;
+               if (limit < 5) {
+                       printk(KERN_WARNING
+                              "munmap of memory not mmapped by process %d"
+                              " (%s): 0x%lx-0x%lx\n",
+                              current->pid, current->comm,
+                              start, start + len - 1);
+                       limit++;
+               }
                return -EINVAL;
        }