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# Use the default kernel version if the Makefile doesn't override it

LINUX_RELEASE?=1

LINUX_VERSION-3.18 = .27
LINUX_VERSION-4.1 = .20
LINUX_VERSION-4.3 = .4
LINUX_VERSION-4.4 = .6

LINUX_KERNEL_MD5SUM-3.18.27 = 015a01bf84e7c6bc9952551b4da45044
LINUX_KERNEL_MD5SUM-4.1.20 = 075c38a3a23ca5bc80437b13606df00a
LINUX_KERNEL_MD5SUM-4.3.4 = 5275d02132107c28b85f986bad576d91
LINUX_KERNEL_MD5SUM-4.4.6 = efc822dad2149e40cc908718a4fea1d3

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_MD5SUM:=$(LINUX_KERNEL_MD5SUM-$(strip $(LINUX_VERSION)))
LINUX_KERNEL_MD5SUM?=x