MIPS: smp-cps: hotplug support

[uclinux-h8/linux.git] / kernel / sys.c

diff --git a/kernel/sys.c b/kernel/sys.c
index adaeab6..fba0f29 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1996,6 +1996,21 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
                if (arg2 || arg3 || arg4 || arg5)
                        return -EINVAL;
                return current->no_new_privs ? 1 : 0;
+       case PR_GET_THP_DISABLE:
+               if (arg2 || arg3 || arg4 || arg5)
+                       return -EINVAL;
+               error = !!(me->mm->def_flags & VM_NOHUGEPAGE);
+               break;
+       case PR_SET_THP_DISABLE:
+               if (arg3 || arg4 || arg5)
+                       return -EINVAL;
+               down_write(&me->mm->mmap_sem);
+               if (arg2)
+                       me->mm->def_flags |= VM_NOHUGEPAGE;
+               else
+                       me->mm->def_flags &= ~VM_NOHUGEPAGE;
+               up_write(&me->mm->mmap_sem);
+               break;
        default:
                error = -EINVAL;
                break;