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package/linux-backports: fix kernel version check

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The commit 05fea6e4a6 "infra/pkg-kconfig:
do not rely on package's .config as a timestamp" broke the kernel
version check of this linux-backports package (it was no longer
executed). Since linux-4.19, the kernel's build system internally
touches its .config file, so it can no longer be used as a stamp file.
The stamp file defined in KCONFIG_STAMP_DOTCONFIG variable of
pkg-kconfig infra need to be used instead.

This commit fixes the kernel version check.

Signed-off-by: Julien Olivain <ju.o@free.fr>
Reviewed-by: Petr Vorel <petr.vorel@gmail.com>
Tested-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Julien Olivain 2020-11-13 14:09:40 +01:00 committed by Yann E. MORIN
parent 7a5873ce5a
commit 464bb73b92
1 changed files with 8 additions and 5 deletions
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13
package/linux-backports/linux-backports.mk
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@ -85,21 +85,24 @@ $(eval $(kconfig-package))
# not have been parsed yet, so the Linux build dir LINUX_DIR is not yet
# known. Thus, we use a "secondary expansion" so the rule is re-evaluated
# after all Makefiles are parsed, and thus at that time we will have the
# LINUX_DIR variable set to the proper value.
# LINUX_DIR variable set to the proper value. Moreover, since linux-4.19,
# the kernel's build system internally touches its .config file, so we
# can't use it as a stamp file. We use the LINUX_KCONFIG_STAMP_DOTCONFIG
# instead.
#
# Furthermore, we want to check the kernel version, since linux-backports
# only supports kernels >= 3.0. To avoid overriding linux-backports'
# .config rule defined in the kconfig-package infra, we use an
# intermediate stamp-file.
# KCONFIG_STAMP_DOTCONFIG rule defined in the kconfig-package infra, we
# use an intermediate stamp-file.
#
# Finally, it must also come after the call to kconfig-package, so we get
# LINUX_BACKPORTS_DIR properly defined (because the target part of the
# rule is not re-evaluated).
#
$(LINUX_BACKPORTS_DIR)/.config: $(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version
$(LINUX_BACKPORTS_DIR)/$(LINUX_BACKPORTS_KCONFIG_STAMP_DOTCONFIG): $(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version
.SECONDEXPANSION:
$(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version: $$(LINUX_DIR)/.config
$(LINUX_BACKPORTS_DIR)/.stamp_check_kernel_version: $$(LINUX_DIR)/$$(LINUX_KCONFIG_STAMP_DOTCONFIG)
$(Q)LINUX_VERSION_PROBED=$(LINUX_VERSION_PROBED); \
if [ $${LINUX_VERSION_PROBED%%.*} -lt 3 ]; then \
printf "Linux version '%s' is too old for linux-backports (needs 3.0 or later)\n" \