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

LINUX_RELEASE?=1

LINUX_VERSION-3.18 = .71
LINUX_VERSION-4.4 = .108
LINUX_VERSION-4.9 = .73
LINUX_VERSION-4.14 = .11

LINUX_KERNEL_HASH-3.18.71 = 5abc9778ad44ce02ed6c8ab52ece8a21c6d20d21f6ed8a19287b4a38a50c1240
LINUX_KERNEL_HASH-4.4.108 = 5a001198625ce9f7b0ef1e4b43e033aea859e1ef3509532412cce8f0375ba51a
LINUX_KERNEL_HASH-4.9.73 = 558b65c53f6d6c421d897ad4b651e51ba341fe4dd97122ec922e23ebd2c16e2b
LINUX_KERNEL_HASH-4.14.11 = 7768956a513f1d4eeb49ba6b55c5b131da60f1a698a3b3657718bf23a6b86d0a

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