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kernel: filter versioned kmod items in make

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version_filter calls package-metadata.pl for every list that contains
a versioned item such as "foo@ge6.18". Parsing package/kernel/linux
runs it about 40 times, which takes 1.3 s of 2.2 s, and this parse is
on the critical path of every build.

Filter items of the form <name>@<op><version> in make. The version
comparison stays in package-metadata.pl, but runs only once per
version. Other forms are passed to package-metadata.pl as before.

The only difference in the output: items without a version condition
are no longer passed through the shell, so quotes in a KCONFIG value
are kept. That list is only used for variable names, so the result is
the same. All kmod packages and images are identical.

Signed-off-by: John Crispin <john@phrozen.org>
This commit is contained in:
John Crispin committed 2026-09-22 18:18:58 +02:00
1 parent bb332115ba
commit a15df19727
1 file changed
+31 -1
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include/kernel.mk
+31 -1
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@@ -273,7 +273,37 @@ $(call KernelPackage/$(1)/config)
endef
version_filter=$(if $(findstring @,$(1)),$(shell $(SCRIPT_DIR)/package-metadata.pl version_filter $(KERNEL_PATCHVER) $(1)),$(1))
version_filter_perl=$(shell $(SCRIPT_DIR)/package-metadata.pl version_filter $(KERNEL_PATCHVER) $(1))
# Items of the form <name>@<op><version> are filtered in make, as a perl
# call per list costs seconds when parsing all kmod packages. The version
# comparison stays in package-metadata.pl, but runs only once per version.
# Any other form of item is passed to package-metadata.pl as before.
# $(1): version, returns the operators that are true for KERNEL_PATCHVER
version_ops=$(if $(filter undefined,$(origin version_ops/$(1))),$(eval \
version_ops/$(1):=$(call version_filter_perl,$(foreach op,lt le gt ge eq ne,$(op)@$(op)$(1)))))$(version_ops/$(1))
strip_digits=$(subst 9,,$(subst 8,,$(subst 7,,$(subst 6,,$(subst 5,,$(subst 4,,$(subst 3,,$(subst 2,,$(subst 1,,$(subst 0,,$(1)))))))))))
# $(1): version, returns y if it is a list of numbers separated by dots
version_is_plain=$(if $(or $(filter .% %.,$(1)),$(findstring ..,$(1)),$(subst .,,$(call strip_digits,$(1)))),,$(if $(findstring .,$(1)),y))
# $(1): condition such as ge6.18
version_cond_op=$(firstword $(foreach op,lt le gt ge eq ne,$(if $(filter $(op)%,$(1)),$(op))))
version_cond_ver=$(patsubst $(call version_cond_op,$(1))%,%,$(1))
# $(1): item such as foo@ge6.18, $(2): name, $(3): condition
version_filter_item=$(if $(and $(2),$(call version_cond_op,$(3)),$(call version_is_plain,$(call version_cond_ver,$(3)))), \
$(if $(filter $(call version_cond_op,$(3)),$(call version_ops,$(call version_cond_ver,$(3)))),$(2)), \
$(call version_filter_perl,$(1)))
version_filter=$(if $(findstring @,$(1)),$(strip $(foreach item,$(1), \
$(if $(findstring @,$(item)), \
$(if $(filter 2,$(words $(subst @, ,$(item)))), \
$(call version_filter_item,$(item),$(word 1,$(subst @, ,$(item))),$(word 2,$(subst @, ,$(item)))), \
$(call version_filter_perl,$(item))), \
$(item)))),$(1))
# 1: priority (optional)
# 2: module list