1 files changed, 37 insertions, 25 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 34579b23ebd5..21d4029a07b3 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -28,7 +28,7 @@
 #include <linux/mempolicy.h>
 #include <linux/rmap.h>
 #include <linux/mmu_notifier.h>
-#include <linux/perf_counter.h>
+#include <linux/perf_event.h>
 
 #include <asm/uaccess.h>
 #include <asm/cacheflush.h>
@@ -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
@@ -573,9 +570,9 @@ again:			remove_next = 1 + (end > next->vm_end);
 
         /*
          * When changing only vma->vm_end, we don't really need
-         * anon_vma lock: but is that case worth optimizing out?
+         * anon_vma lock.
          */
-        if (vma->anon_vma)
+        if (vma->anon_vma && (insert || importer || start != vma->vm_start))
                 anon_vma = vma->anon_vma;
         if (anon_vma) {
                 spin_lock(&anon_vma->lock);
@@ -659,9 +656,6 @@ again:			remove_next = 1 + (end > next->vm_end);
         validate_mm(mm);
 }
 
-/* Flags that can be inherited from an existing mapping when merging */
-#define VM_MERGEABLE_FLAGS (VM_CAN_NONLINEAR)
-
 /*
  * If the vma has a ->close operation then the driver probably needs to release
  * per-vma resources, so we don't attempt to merge those.
@@ -669,7 +663,8 @@ again:			remove_next = 1 + (end > next->vm_end);
 static inline int is_mergeable_vma(struct vm_area_struct *vma,
                         struct file *file, unsigned long vm_flags)
 {
-        if ((vma->vm_flags ^ vm_flags) & ~VM_MERGEABLE_FLAGS)
+        /* VM_CAN_NONLINEAR may get set later by f_op->mmap() */
+        if ((vma->vm_flags ^ vm_flags) & ~VM_CAN_NONLINEAR)
                 return 0;
         if (vma->vm_file != file)
                 return 0;
@@ -908,7 +903,7 @@ void vm_stat_account(struct mm_struct *mm, unsigned long flags,
 #endif /* CONFIG_PROC_FS */
 
 /*
- * The caller must hold down_write(current->mm->mmap_sem).
+ * The caller must hold down_write(&current->mm->mmap_sem).
  */
 
 unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
@@ -954,6 +949,24 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
         if (mm->map_count > sysctl_max_map_count)
                 return -ENOMEM;
 
+        if (flags & MAP_HUGETLB) {
+                struct user_struct *user = NULL;
+                if (file)
+                        return -EINVAL;
+
+                /*
+                 * VM_NORESERVE is used because the reservations will be
+                 * taken when vm_ops->mmap() is called
+                 * A dummy user value is used because we are not locking
+                 * memory so no accounting is necessary
+                 */
+                len = ALIGN(len, huge_page_size(&default_hstate));
+                file = hugetlb_file_setup(HUGETLB_ANON_FILE, len, VM_NORESERVE,
+                                                &user, HUGETLB_ANONHUGE_INODE);
+                if (IS_ERR(file))
+                        return PTR_ERR(file);
+        }
+
         /* Obtain the address to map to. we verify (or select) it and ensure
          * that it represents a valid section of the address space.
          */
@@ -968,11 +981,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
         vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags) |
                         mm->def_flags | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
 
-        if (flags & MAP_LOCKED) {
+        if (flags & MAP_LOCKED)
                 if (!can_do_mlock())
                         return -EPERM;
-                vm_flags |= VM_LOCKED;
-        }
 
         /* mlock MCL_FUTURE? */
         if (vm_flags & VM_LOCKED) {
@@ -1198,21 +1209,21 @@ munmap_back:
                         goto unmap_and_free_vma;
                 if (vm_flags & VM_EXECUTABLE)
                         added_exe_file_vma(mm);
+
+                /* Can addr have changed??
+                 *
+                 * Answer: Yes, several device drivers can do it in their
+                 *         f_op->mmap method. -DaveM
+                 */
+                addr = vma->vm_start;
+                pgoff = vma->vm_pgoff;
+                vm_flags = vma->vm_flags;
         } else if (vm_flags & VM_SHARED) {
                 error = shmem_zero_setup(vma);
                 if (error)
                         goto free_vma;
         }
 
-        /* Can addr have changed??
-         *
-         * Answer: Yes, several device drivers can do it in their
-         *         f_op->mmap method. -DaveM
-         */
-        addr = vma->vm_start;
-        pgoff = vma->vm_pgoff;
-        vm_flags = vma->vm_flags;
-
         if (vma_wants_writenotify(vma))
                 vma->vm_page_prot = vm_get_page_prot(vm_flags & ~VM_SHARED);
 
@@ -1223,7 +1234,7 @@ munmap_back:
         if (correct_wcount)
                 atomic_inc(&inode->i_writecount);
 out:
-        perf_counter_mmap(vma);
+        perf_event_mmap(vma);
 
         mm->total_vm += len >> PAGE_SHIFT;
         vm_stat_account(mm, vm_flags, file, len >> PAGE_SHIFT);
@@ -2114,6 +2125,7 @@ void exit_mmap(struct mm_struct *mm)
         /* Use -1 here to ensure all VMAs in the mm are unmapped */
         end = unmap_vmas(&tlb, vma, 0, -1, &nr_accounted, NULL);
         vm_unacct_memory(nr_accounted);
+
         free_pgtables(tlb, vma, FIRST_USER_ADDRESS, 0);
         tlb_finish_mmu(tlb, 0, end);
 
@@ -2311,7 +2323,7 @@ int install_special_mapping(struct mm_struct *mm,
 
         mm->total_vm += len >> PAGE_SHIFT;
 
-        perf_counter_mmap(vma);
+        perf_event_mmap(vma);
 
         return 0;
 }