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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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10
zdev/src/Makefile
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@@ -4,6 +4,16 @@ include ../../common.mak
ALL_CPPFLAGS += -I ../include -std=gnu99 -Wno-unused-parameter \
-Wno-missing-field-initializers
# Adding ZDEV_ALWAYS_UPDATE_INITRD=1 option will update the initial RAM-disk
# without the user interaction upon the modification of a persistent device
# configuration.
ifeq ($(ZDEV_ALWAYS_UPDATE_INITRD),1)
ALL_CPPFLAGS += -DZDEV_ALWAYS_UPDATE_INITRD=true
else
ALL_CPPFLAGS += -DZDEV_ALWAYS_UPDATE_INITRD=false
endif
# Core
chzdev_objects += attrib.o chzdev.o device.o devnode.o devtype.o exit_code.o \
export.o hash.o inuse.o misc.o namespace.o opts.o path.o \