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zdev: Add build option to update initial RAM-disk by default

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Some Linux distributions always include a copy of all persistent device
configuration data when updating the initial RAM-disk. This makes
chzdev's persistent device configuration changes ineffective because
device configuration directives applied in the RAM-disk take precedence
over those stored in the root filesystem.

This patch introduces a new build-time switch which allows distributions
to specify that whenever there is a persistent device configuration
change, the RAM-disk is updated automatically.

This feature can be enabled by adding 'ZDEV_ALWAYS_UPDATE_INITRD=1' as
a zdev build option. Where, by default ZDEV_ALWAYS_UPDATE_INITRD is 0.

Co-developed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Vineeth Vijayan
2020-12-10 18:52:27 +01:00
committed by Jan Höppner
parent 663262c962
commit 7dd03eaeec
5 changed files with 95 additions and 15 deletions
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README.md
+16 -4
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@@ -284,10 +284,11 @@ build options:
This table lists additional build or install options:
| __COMPONENT__ | __OPTION__ | __TOOLS__ |
|----------------|:----------------:|:-------------------------------:|
| dracut | `HAVE_DRACUT` | zdev |
| initramfs-tools| `HAVE_INITRAMFS` | zdev |
| __COMPONENT__ | __OPTION__ | __TOOLS__ |
|------------------|:----------------------------:|:--------------:|
| dracut | `HAVE_DRACUT` | zdev |
| initramfs-tools | `HAVE_INITRAMFS` | zdev |
| | `ZDEV_ALWAYS_UPDATE_INITRD` | zdev |
The s390-tools build process uses "pkg-config" if available and hard-coded
compiler and linker options otherwise.
@@ -378,6 +379,17 @@ the different tools are provided:
Distributors with different boot or RAM-disk mechanisms should provide
a custom zdev-root-update helper script.
- `ZDEV_ALWAYS_UPDATE_INITRD=1` upon modification of any persistent device
configuration, chzdev updates the initial RAM-disk by default, without any
additional user interaction.
For some distributions, all the configuration attributes must be copied to
the initial RAM-disk. Because the device configuration directives applied
in the initial RAM-disk takes precedence over those stored in the root file-
system. This copying is done usually by explicitly invoking a command. This
build option makes it user-friendly and does this copying without any manual
intervention.
Some functions of zdev require that the following programs are available:
- modprobe (kmod)