Update linux-build.yml

.github/workflows/linux-build.yml

@@ -21,10 +21,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
-            series: 3.x
-            version: 3.10
-
           - os: ubuntu-20.04
             series: 4.x
             version: 4.9.1
@@ -34,8 +30,8 @@ jobs:
             version: 5.9.6
 
           - os: ubuntu-latest
-            series: 5.x
-            version: 5.15
+            series: latest
+            version: latest
 
     steps:
     - uses: actions/checkout@v2
@@ -50,6 +46,12 @@ jobs:
         [ "${{ matrix.cc }}" != "gcc-4.8" ] || sudo apt-get -y install gcc-4.8
     - name: Setup Linux
       run: |
+        if [ "$KSER" == "latest" ]; then
+          KSER=$(curl -s https://cdn.kernel.org/pub/linux/kernel/ | grep -o 'v[0-9]\+\.[0-9a-zA-Z]\+/' | sed 's/\/\s*//' | sort -t. -k2,2V -k3,3V -k4,4V | tail -n 1 | sed 's/v//')
+        fi
+        if [ "$KVER" == "latest" ]; then
+          KVER=$(curl -s https://cdn.kernel.org/pub/linux/kernel/v$KSER/ | grep -o 'linux-[0-9]\+\.[0-9]\+\.[0-9]\+\.tar\.gz' | sort -t- -k2,2n -k3,3n -k4,4n | tail -n 1)
+        fi
         install -d kernel
         curl -s https://cdn.kernel.org/pub/linux/kernel/v$KSER/linux-$KVER.tar.xz | tar -C kernel --strip-components=1 -xJ
         make -C kernel CC=${CC:=gcc} defconfig