check/servise: use cached kdat values for features check

The kerndat_init() is now called before the jump to action handler. This
allows us to directly use kdat without calling to the corresponding
kerndat_*() methods.

✓ travis-ci: success for lazy-pages: update checks for availability of userfaultfd (rev3)
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/cr-check.c

@@ -676,9 +676,6 @@ static int check_ptrace_dump_seccomp_filters(void)
 
 static int check_mem_dirty_track(void)
 {
-	if (kerndat_get_dirty_track() < 0)
-		return -1;
-
 	if (!kdat.has_dirty_track) {
 		pr_warn("Dirty tracking is OFF. Memory snapshot will not work.\n");
 		return -1;
@@ -772,9 +769,6 @@ static int check_aio_remap(void)
 
 static int check_fdinfo_lock(void)
 {
-	if (kerndat_fdinfo_has_lock())
-		return -1;
-
 	if (!kdat.has_fdinfo_lock) {
 		pr_err("fdinfo doesn't contain the lock field\n");
 		return -1;
@@ -931,12 +925,6 @@ out:
 
 static int check_tcp_halt_closed(void)
 {
-	int ret;
-
-	ret = kerndat_tcp_repair();
-	if (ret < 0)
-		return -1;
-
 	if (!kdat.has_tcp_half_closed) {
 		pr_err("TCP_REPAIR can't be enabled for half-closed sockets\n");
 		return -1;
@@ -1023,9 +1011,6 @@ static int check_userns(void)
 
 static int check_loginuid(void)
 {
-	if (kerndat_loginuid() < 0)
-		return -1;
-
 	if (kdat.luid != LUID_FULL) {
 		pr_warn("Loginuid restore is OFF.\n");
 		return -1;
@@ -1048,9 +1033,6 @@ static int check_compat_cr(void)
 
 static int check_uffd(void)
 {
-	if (kerndat_uffd())
-		return -1;
-
 	if (!kdat.has_uffd) {
 		pr_err("UFFD is not supported\n");
 		return -1;

criu/cr-service.c

@@ -886,22 +886,11 @@ static int handle_feature_check(int sk, CriuReq * msg)
 		setproctitle("feature-check --rpc");
 
 		if ((msg->features->has_mem_track == 1) &&
-		    (msg->features->mem_track == true)) {
-
-			feat.mem_track = true;
-			ret = kerndat_get_dirty_track();
-
-			if (ret)
-				feat.mem_track = false;
-
-			if (!kdat.has_dirty_track)
-				feat.mem_track = false;
-		}
+		    (msg->features->mem_track == true))
+			feat.mem_track = kdat.has_dirty_track;
 
 		if ((msg->features->has_lazy_pages == 1) &&
-		    (msg->features->lazy_pages == true)) {
-			ret = kerndat_uffd();
-
+		    (msg->features->lazy_pages == true))
 			/*
 			 * Not checking for specific UFFD features yet.
 			 * If no error is returned it is probably
@@ -909,11 +898,7 @@ static int handle_feature_check(int sk, CriuReq * msg)
 			 * be extended in the future for a more detailed
 			 * UFFD feature check.
 			 */
-			if (ret || !kdat.has_uffd)
-				feat.lazy_pages = false;
-			else
-				feat.lazy_pages = true;
-		}
+			feat.lazy_pages = kdat.has_uffd;
 
 		resp.features = &feat;
 		resp.type = msg->type;