SHM: code beautify

src/ucs/sys/sys.c

@@ -1238,9 +1238,10 @@ ucs_status_t ucs_sys_get_boot_id(uint64_t *high, uint64_t *low)
                      &v5[3], &v5[4], &v5[5]);
         if (res == 10) { /* 10 values should be scanned */
             status       = UCS_OK;
-            boot_id.low  = (uint64_t)v1 | ((uint64_t)v2 << 32) | ((uint64_t)v3 << 48);
+            boot_id.low  = ((uint64_t)v1) | ((uint64_t)v2 << 32) |
+                           ((uint64_t)v3 << 48);
             boot_id.high = v4;
-            for (i = 0; i < sizeof(v5); i++) {
+            for (i = 0; i < ucs_array_size(v5); i++) {
                 boot_id.high |= (uint64_t)v5[i] << (16 + (i * 8));
             }
         }

src/uct/sm/base/sm_iface.c

@@ -100,6 +100,8 @@ int uct_sm_iface_is_reachable(const uct_iface_h tl_iface,
 
     /* do not merge these evaluations into single 'if' due
      * to clags compilation warning */
+    /* check if both processes are on same host and
+     * both of them are in root (or non-root) pid namespace */
     if (ext_addr->super.id != my_addr.super.id) {
         return 0;
     }
@@ -108,6 +110,8 @@ int uct_sm_iface_is_reachable(const uct_iface_h tl_iface,
         return 1; /* both processes are in root namespace */
     }
 
+    /* ok, we are in non-root PID namespace - return 1 if ID of
+     * namespaces are same */
     return ext_addr->ipc_ns == my_addr.ipc_ns;
 }