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

LINUX_RELEASE?=1

LINUX_VERSION-3.18 = .125
LINUX_VERSION-4.9 = .138
LINUX_VERSION-4.14 = .82

LINUX_KERNEL_HASH-3.18.125 = 708433b360efd8623f7303b721ffb0e7c59cbe8552f1a3f4c0d980a12b4ed90e
LINUX_KERNEL_HASH-4.9.138 = 92301242601d50854b173a3fdec318480e24fc86f32102003a9ed7108fab21b7
LINUX_KERNEL_HASH-4.14.82 = a790a2e6f6a76d70decec91d1b7bcfba90f821b076273da070f6e0e1e6391dad

remove_uri_prefix=$(subst git://,,$(subst http://,,$(subst https://,,$(1))))
sanitize_uri=$(call qstrip,$(subst @,_,$(subst :,_,$(subst .,_,$(subst -,_,$(subst /,_,$(1)))))))

ifneq ($(call qstrip,$(CONFIG_KERNEL_GIT_CLONE_URI)),)
  LINUX_VERSION:=$(call sanitize_uri,$(call remove_uri_prefix,$(CONFIG_KERNEL_GIT_CLONE_URI)))
  ifeq ($(call qstrip,$(CONFIG_KERNEL_GIT_REF)),)
    CONFIG_KERNEL_GIT_REF:=HEAD
  endif
  LINUX_VERSION:=$(LINUX_VERSION)-$(call sanitize_uri,$(CONFIG_KERNEL_GIT_REF))
else
ifdef KERNEL_PATCHVER
  LINUX_VERSION:=$(KERNEL_PATCHVER)$(strip $(LINUX_VERSION-$(KERNEL_PATCHVER)))
endif
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