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# Use the default kernel version if the Makefile doesn't override it
LINUX_RELEASE?=1
LINUX_VERSION-3.18 = .43
LINUX_VERSION-4.4 = .86
LINUX_VERSION-4.9 = .47
LINUX_KERNEL_HASH-3.18.43 = 1236e8123a6ce537d5029232560966feed054ae31776fe8481dd7d18cdd5492c
LINUX_KERNEL_HASH-4.4.86 = cb7787b9cc77cd3f0c6e5a9d6aabec989a932f8145251431cf186f6ad850e2a8
LINUX_KERNEL_HASH-4.9.47 = 75be9679d69460a45e77a61474a6d8eee34de21b9929fe4992971dff122541c9
ifdef KERNEL_PATCHVER
LINUX_VERSION:=$(KERNEL_PATCHVER)$(strip $(LINUX_VERSION-$(KERNEL_PATCHVER)))
endif
split_version=$(subst ., ,$(1))
merge_version=$(subst $(space),.,$(1))
KERNEL_BASE=$(firstword $(subst -, ,$(LINUX_VERSION)))
KERNEL=$(call merge_version,$(wordlist 1,2,$(call split_version,$(KERNEL_BASE))))
KERNEL_PATCHVER ?= $(KERNEL)
# disable the md5sum check for unknown kernel versions
LINUX_KERNEL_HASH:=$(LINUX_KERNEL_HASH-$(strip $(LINUX_VERSION)))
LINUX_KERNEL_HASH?=x
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