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2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/tools/testing/selftests/rcutorture/doc/initrd.txt
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@@ -1,9 +1,11 @@
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-This document describes one way to create the initrd directory hierarchy
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-in order to allow an initrd to be built into your kernel.  The trick
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-here is to steal the initrd file used on your Linux laptop, Ubuntu in
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-this case.  There are probably much better ways of doing this.
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+The rcutorture scripting tools automatically create an initrd containing
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+a single statically linked binary named "init" that loops over a
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+very long sleep() call.  In both cases, this creation is done by
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+tools/testing/selftests/rcutorture/bin/mkinitrd.sh.
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5
 
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-That said, here are the commands:
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+However, if you don't like the notion of statically linked bare-bones
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+userspace environments, you might wish to press an existing initrd
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+into service:
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 ------------------------------------------------------------------------
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 cd tools/testing/selftests/rcutorture
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@@ -11,103 +13,4 @@
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 mkdir initrd
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 cd initrd
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 cpio -id < /tmp/initrd.img.zcat
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-------------------------------------------------------------------------
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-
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-Another way to create an initramfs image is using "dracut"[1], which is
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-available on many distros, however the initramfs dracut generates is a cpio
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-archive with another cpio archive in it, so an extra step is needed to create
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-the initrd directory hierarchy.
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-
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-Here are the commands to create a initrd directory for rcutorture using
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-dracut:
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-
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-------------------------------------------------------------------------
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-dracut --no-hostonly --no-hostonly-cmdline --module "base bash shutdown" /tmp/initramfs.img
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-cd tools/testing/selftests/rcutorture
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-mkdir initrd
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-cd initrd
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-/usr/lib/dracut/skipcpio /tmp/initramfs.img | zcat | cpio -id < /tmp/initramfs.img
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-------------------------------------------------------------------------
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-
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-Interestingly enough, if you are running rcutorture, you don't really
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-need userspace in many cases.  Running without userspace has the
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-advantage of allowing you to test your kernel independently of the
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-distro in place, the root-filesystem layout, and so on.  To make this
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-happen, put the following script in the initrd's tree's "/init" file,
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-with 0755 mode.
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-
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-------------------------------------------------------------------------
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-#!/bin/sh
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-
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-[ -d /dev ] || mkdir -m 0755 /dev
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-[ -d /root ] || mkdir -m 0700 /root
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-[ -d /sys ] || mkdir /sys
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-[ -d /proc ] || mkdir /proc
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-[ -d /tmp ] || mkdir /tmp
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-mkdir -p /var/lock
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-mount -t sysfs -o nodev,noexec,nosuid sysfs /sys
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-mount -t proc -o nodev,noexec,nosuid proc /proc
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-# Some things don't work properly without /etc/mtab.
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-ln -sf /proc/mounts /etc/mtab
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-
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-# Note that this only becomes /dev on the real filesystem if udev's scripts
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-# are used; which they will be, but it's worth pointing out
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-if ! mount -t devtmpfs -o mode=0755 udev /dev; then
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-	echo "W: devtmpfs not available, falling back to tmpfs for /dev"
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-	mount -t tmpfs -o mode=0755 udev /dev
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-	[ -e /dev/console ] || mknod --mode=600 /dev/console c 5 1
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-	[ -e /dev/kmsg ] || mknod --mode=644 /dev/kmsg c 1 11
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-	[ -e /dev/null ] || mknod --mode=666 /dev/null c 1 3
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-fi
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-
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-mkdir /dev/pts
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-mount -t devpts -o noexec,nosuid,gid=5,mode=0620 devpts /dev/pts || true
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-mount -t tmpfs -o "nosuid,size=20%,mode=0755" tmpfs /run
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-mkdir /run/initramfs
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-# compatibility symlink for the pre-oneiric locations
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-ln -s /run/initramfs /dev/.initramfs
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-
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-# Export relevant variables
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-export ROOT=
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-export ROOTDELAY=
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-export ROOTFLAGS=
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-export ROOTFSTYPE=
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-export IP=
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-export BOOT=
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-export BOOTIF=
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-export UBIMTD=
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-export break=
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-export init=/sbin/init
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-export quiet=n
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-export readonly=y
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-export rootmnt=/root
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-export debug=
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-export panic=
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-export blacklist=
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-export resume=
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-export resume_offset=
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-export recovery=
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-
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-for i in /sys/devices/system/cpu/cpu*/online
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-do
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-	case $i in
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-	'/sys/devices/system/cpu/cpu0/online')
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-		;;
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-	'/sys/devices/system/cpu/cpu*/online')
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-		;;
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-	*)
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-		echo 1 > $i
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-		;;
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-	esac
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-done
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-
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-while :
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-do
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-	sleep 10
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-done
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-------------------------------------------------------------------------
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-
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-References:
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-[1]: https://dracut.wiki.kernel.org/index.php/Main_Page
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-[2]: http://blog.elastocloud.org/2015/06/rapid-linux-kernel-devtest-with-qemu.html
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-[3]: https://www.centos.org/forums/viewtopic.php?t=51621
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+# Manually verify that initrd contains needed binaries and libraries.