VM: add "vm_munmap()" helper function

Like the vm_brk() function, this is the same as "do_munmap()", except it
does the VM locking for the caller.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 16 insertions, 8 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index df51891c8646..4af45f519f19 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2107,21 +2107,24 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 
         return 0;
 }
-
 EXPORT_SYMBOL(do_munmap);
 
-SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
+int vm_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 {
         int ret;
-        struct mm_struct *mm = current->mm;
-
-        profile_munmap(addr);
 
         down_write(&mm->mmap_sem);
-        ret = do_munmap(mm, addr, len);
+        ret = do_munmap(mm, start, len);
         up_write(&mm->mmap_sem);
         return ret;
 }
+EXPORT_SYMBOL(vm_munmap);
+
+SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
+{
+        profile_munmap(addr);
+        return vm_munmap(current->mm, addr, len);
+}
 
 static inline void verify_mm_writelocked(struct mm_struct *mm)
 {
diff --git a/mm/nommu.c b/mm/nommu.c
index 634193324a6b..11a69b22bd4b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1709,16 +1709,21 @@ erase_whole_vma:
 }
 EXPORT_SYMBOL(do_munmap);
 
-SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
+int vm_munmap(struct mm_struct *mm, unsigned long addr, size_t len)
 {
         int ret;
-        struct mm_struct *mm = current->mm;
 
         down_write(&mm->mmap_sem);
         ret = do_munmap(mm, addr, len);
         up_write(&mm->mmap_sem);
         return ret;
 }
+EXPORT_SYMBOL(vm_munmap);
+
+SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
+{
+        return vm_munmap(current->mm, addr, len);
+}
 
 /*
  * release all the mappings made in a process's VM space