cgroup: leave blkio cgroup value checking to kernel

The range of valid values for cgroup tunables has
changed in the past and may change again in future
kernels. Avoid hardcoding range checks in libvirt
code, delegating range checking to the kernel itself.
Signed-off-by: NChen Hanxiao <chenhanxiao@cn.fujitsu.com>

src/util/vircgroup.c

@@ -1796,13 +1796,6 @@ virCgroupPathOfController(virCgroupPtr group,
 int
 virCgroupSetBlkioWeight(virCgroupPtr group, unsigned int weight)
 {
-    if (weight > 1000 || weight < 100) {
-        virReportError(VIR_ERR_INVALID_ARG,
-                       _("weight '%u' must be in range (100, 1000)"),
-                       weight);
-        return -1;
-    }
-
     return virCgroupSetValueU64(group,
                                 VIR_CGROUP_CONTROLLER_BLKIO,
                                 "blkio.weight",
@@ -1854,13 +1847,6 @@ virCgroupSetBlkioDeviceWeight(virCgroupPtr group,
     struct stat sb;
     int ret;
 
-    if (weight && (weight > 1000 || weight < 100)) {
-        virReportError(VIR_ERR_INVALID_ARG,
-                       _("weight '%u' must be in range (100, 1000)"),
-                       weight);
-        return -1;
-    }
-
     if (stat(path, &sb) < 0) {
         virReportSystemError(errno,
                              _("Path '%s' is not accessible"),