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| author |   Paul E. McKenney <paulmck@kernel.org> | 2020-07-13 14:18:33 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-08-24 18:45:33 -0700 |
| commit | 33595581f53011d1f0ba64a9a2f76d6fa5528f7f (patch) | |
| tree | 19fe759dc27982598f383dbc4035d6571d0bf1ec /tools/testing/selftests/rcutorture/doc/initrd.txt | |
| parent | rcutorture: Replace HTTP links with HTTPS ones (diff) | |
| download | linux-dev-33595581f53011d1f0ba64a9a2f76d6fa5528f7f.tar.xz linux-dev-33595581f53011d1f0ba64a9a2f76d6fa5528f7f.zip | |
torture: Update initrd documentation
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>
Diffstat (limited to 'tools/testing/selftests/rcutorture/doc/initrd.txt')
| -rw-r--r-- | tools/testing/selftests/rcutorture/doc/initrd.txt | 36 |
1 files changed, 7 insertions, 29 deletions
diff --git a/tools/testing/selftests/rcutorture/doc/initrd.txt b/tools/testing/selftests/rcutorture/doc/initrd.txt index 933b4fd12327..41a4255865d4 100644 --- a/tools/testing/selftests/rcutorture/doc/initrd.txt +++ b/tools/testing/selftests/rcutorture/doc/initrd.txt @@ -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. |