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torture: Update initrd documentation

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The rcu-test-image.txt documentation covers a very uncommon case where
a real userspace environment is required.  However, someone reading this
document might reasonably conclude that this is in fact a prerequisite.
In addition, the initrd.txt file mentions dracut, which is no longer used.
This commit therefore provides the needed updates.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney
2020-07-13 14:18:33 -07:00
parent afcdf2319d
commit 33595581f5
2 changed files with 37 additions and 34 deletions
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36
tools/testing/selftests/rcutorture/doc/initrd.txt
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@@ -1,12 +1,11 @@
The rcutorture scripting tools automatically create the needed initrd
directory using dracut. Failing that, this tool will create an initrd
containing a single statically linked binary named "init" that loops
over a very long sleep() call. In both cases, this creation is done
by tools/testing/selftests/rcutorture/bin/mkinitrd.sh.
The rcutorture scripting tools automatically create an initrd containing
a single statically linked binary named "init" that loops over a
very long sleep() call. In both cases, this creation is done by
tools/testing/selftests/rcutorture/bin/mkinitrd.sh.
However, if you are attempting to run rcutorture on a system that does
not have dracut installed, and if you don't like the notion of static
linking, you might wish to press an existing initrd into service:
However, if you don't like the notion of statically linked bare-bones
userspace environments, you might wish to press an existing initrd
into service:
------------------------------------------------------------------------
cd tools/testing/selftests/rcutorture
@@ -15,24 +14,3 @@ mkdir initrd
cd initrd
cpio -id < /tmp/initrd.img.zcat
# Manually verify that initrd contains needed binaries and libraries.
------------------------------------------------------------------------
Interestingly enough, if you are running rcutorture, you don't really
need userspace in many cases. Running without userspace has the
advantage of allowing you to test your kernel independently of the
distro in place, the root-filesystem layout, and so on. To make this
happen, put the following script in the initrd's tree's "/init" file,
with 0755 mode.
------------------------------------------------------------------------
#!/bin/sh
while :
do
sleep 10
done
------------------------------------------------------------------------
This approach also allows most of the binaries and libraries in the
initrd filesystem to be dispensed with, which can save significant
space in rcutorture's "res" directory.