init: Try to call reboot(2) to reboot the system from the initramfs.

For some reason, panic=1 is broken on kernel 3.11.  Calling reboot is
more reliable.

Note that qemu won't actually reboot the VM, because we are passing
-no-reboot on the command line, so the VM should exit instead.

diff --git a/configure.ac b/configure.ac
index 791360f..1b3c22b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -28,6 +28,8 @@ test "x$U" != "x" && AC_MSG_ERROR([Compiler not ANSI compliant])
 
 AM_PROG_CC_C_O
 
+AC_CHECK_HEADERS([sys/reboot.h])
+
 dnl Allow the package to override the default list of qemu binary
 dnl names which are tried, since this heavily depends on how qemu
 dnl has been packaged in the downstream distro.

diff --git a/init.c b/init.c
index f19772b..ef7011c 100644 (file)
--- a/init.c
+++ b/init.c
@@ -22,6 +22,10 @@
 #include <stdlib.h>
 #include <unistd.h>
 
+#ifdef HAVE_SYS_REBOOT_H
+#include <sys/reboot.h>
+#endif
+
 int
 main (int argc, char *argv[])
 {
@@ -29,6 +33,14 @@ main (int argc, char *argv[])
   fprintf (stderr, "***** initrd started up OK *****\n");
   fprintf (stderr, "\n");
   fprintf (stderr, "\n");
+
+#if defined(HAVE_SYS_REBOOT_H) && defined(RB_AUTOBOOT)
+  /* Try to reboot the system. */
+  reboot (RB_AUTOBOOT);
+  perror ("reboot");
+  /* Reboot attempt failed, fallthrough below. */
+#endif
+
   fprintf (stderr, "expect to see a kernel panic below, that is normal\n");
   fprintf (stderr, "\n");
   fprintf (stderr, "\n");