mm: introduce mm_populate() for populating new vmas

[deliverable/linux.git] / mm / mlock.c

diff --git a/mm/mlock.c b/mm/mlock.c
index c9bd528b01d2361aa6e37f9791a831c3b2a443e7..a296a49865df2c2837b4b33695a23b9f1dd84b4c 100644 (file)
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -416,7 +416,14 @@ static int do_mlock(unsigned long start, size_t len, int on)
        return error;
 }
 
-static int do_mlock_pages(unsigned long start, size_t len, int ignore_errors)
+/*
+ * __mm_populate - populate and/or mlock pages within a range of address space.
+ *
+ * This is used to implement mlock() and the MAP_POPULATE / MAP_LOCKED mmap
+ * flags. VMAs must be already marked with the desired vm_flags, and
+ * mmap_sem must not be held.
+ */
+int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
 {
        struct mm_struct *mm = current->mm;
        unsigned long end, nstart, nend;
@@ -498,7 +505,7 @@ SYSCALL_DEFINE2(mlock, unsigned long, start, size_t, len)
                error = do_mlock(start, len, 1);
        up_write(&current->mm->mmap_sem);
        if (!error)
-               error = do_mlock_pages(start, len, 0);
+               error = __mm_populate(start, len, 0);
        return error;
 }
 
@@ -564,10 +571,8 @@ SYSCALL_DEFINE1(mlockall, int, flags)
            capable(CAP_IPC_LOCK))
                ret = do_mlockall(flags);
        up_write(&current->mm->mmap_sem);
-       if (!ret && (flags & MCL_CURRENT)) {
-               /* Ignore errors */
-               do_mlock_pages(0, TASK_SIZE, 1);
-       }
+       if (!ret && (flags & MCL_CURRENT))
+               mm_populate(0, TASK_SIZE);
 out:
        return ret;
 }