tools/testing/selftests/rcutorture/doc/initrd.txt

   1 The rcutorture scripting tools automatically create an initrd containing
   2 a single statically linked binary named "init" that loops over a
   3 very long sleep() call.  In both cases, this creation is done by
   4 tools/testing/selftests/rcutorture/bin/mkinitrd.sh.
   5
   6 However, if you don't like the notion of statically linked bare-bones
   7 userspace environments, you might wish to press an existing initrd
   8 into service:
   9
  10 ------------------------------------------------------------------------
  11 cd tools/testing/selftests/rcutorture
  12 zcat /initrd.img > /tmp/initrd.img.zcat
  13 mkdir initrd
  14 cd initrd
  15 cpio -id < /tmp/initrd.img.zcat
  16 # Manually verify that initrd contains needed binaries and libraries.