diff options
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 404319477e71..fa11d91242e8 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -61,7 +61,7 @@ pgprot_t protection_map[16] = { int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */ int sysctl_overcommit_ratio = 50; /* default is 50% */ -int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT; +int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT; atomic_t vm_committed_space = ATOMIC_INIT(0); /* @@ -203,13 +203,6 @@ static void remove_vm_struct(struct vm_area_struct *vma) kmem_cache_free(vm_area_cachep, vma); } -/* - * sys_brk() for the most part doesn't need the global kernel - * lock, except when an application is doing something nasty - * like trying to un-brk an area that has already been mapped - * to a regular file. in this case, the unmapping will need - * to invoke file system routines that need the global lock. - */ asmlinkage unsigned long sys_brk(unsigned long brk) { unsigned long rlim, retval; @@ -1647,7 +1640,7 @@ static void unmap_vma_list(struct mm_struct *mm, struct vm_area_struct *vma) /* * Get rid of page table information in the indicated region. * - * Called with the page table lock held. + * Called with the mm semaphore held. */ static void unmap_region(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev, @@ -2000,6 +1993,9 @@ int insert_vm_struct(struct mm_struct * mm, struct vm_area_struct * vma) __vma = find_vma_prepare(mm,vma->vm_start,&prev,&rb_link,&rb_parent); if (__vma && __vma->vm_start < vma->vm_end) return -ENOMEM; + if ((vma->vm_flags & VM_ACCOUNT) && + security_vm_enough_memory(vma_pages(vma))) + return -ENOMEM; vma_link(mm, vma, prev, rb_link, rb_parent); return 0; } |
