get Linux kernel changelog for specific version

#!/bin/bash
get_kernel_changelog() {
[ -z "$1" ] && return 1
U=https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-$1
curl -qsI $U &>/dev/null || return 2
curl -q $U \
| sed -nre '/^commit/,/^    [^ ]/{s#^commit (.{,8}).*$#C|\1#;s#^    (.*)$#T|\1#;s#^Date: +(.+) +(.+) +(.+) +(.+) +(.+) +(.+)$#D|\3 \2 \5 \4 \6#;/^[CDT]\|(.*)$/{s##\1#;p}}' \
| while readarray -n 3 -t; do
    [ ${#MAPFILE[@]} -ne 3 ] && break
    C=${MAPFILE[0]}
    D=$(LC_ALL=C date -u +%s -d "${MAPFILE[1]}")
    T=${MAPFILE[2]}
    printf '%s [%s] %s\n' $D $C "$T"
    done \
| sed -re '1s#^([0-9]+)#9999999999#' \
| sort -r -n \
| sed -re '1{s#^[^ ]+ (.*)$#\1#};{s#^[^ ]+ (.*)$#\1#}'
}
get_kernel_changelog "$@"