linux: Add 5.4

Change linux_latest to 5.4

pkgs/os-specific/linux/kernel/linux-5.4.nix

@@ -0,0 +1,18 @@
+{ stdenv, buildPackages, fetchurl, perl, buildLinux, modDirVersionArg ? null, ... } @ args:
+
+with stdenv.lib;
+
+buildLinux (args // rec {
+  version = "5.4";
+
+  # modDirVersion needs to be x.y.z, will automatically add .0 if needed
+  modDirVersion = if (modDirVersionArg == null) then concatStringsSep "." (take 3 (splitVersion "${version}.0")) else modDirVersionArg;
+
+  # branchVersion needs to be x.y
+  extraMeta.branch = versions.majorMinor version;
+
+  src = fetchurl {
+    url = "mirror://kernel/linux/kernel/v5.x/linux-${version}.tar.xz";
+    sha256 = "14glqppn90z79b36k4c76mv90q933i2bg54rgwlcl2v7n608jcxz";
+  };
+} // (args.argsOverride or {}))

pkgs/top-level/all-packages.nix

@@ -16233,6 +16233,12 @@ in
     ];
   };
 
+  linux_5_4 = callPackage ../os-specific/linux/kernel/linux-5.4.nix {
+    kernelPatches = [
+      kernelPatches.bridge_stp_helper
+    ];
+  };
+
   linux_testing = callPackage ../os-specific/linux/kernel/linux-testing.nix {
     kernelPatches = [
       kernelPatches.bridge_stp_helper
@@ -16429,7 +16435,7 @@ in
   linux = linuxPackages.kernel;
 
   # Update this when adding the newest kernel major version!
-  linuxPackages_latest = linuxPackages_5_3;
+  linuxPackages_latest = linuxPackages_5_4;
   linux_latest = linuxPackages_latest.kernel;
 
   # Build the kernel modules for the some of the kernels.
@@ -16443,6 +16449,7 @@ in
   linuxPackages_4_14 = recurseIntoAttrs (linuxPackagesFor pkgs.linux_4_14);
   linuxPackages_4_19 = recurseIntoAttrs (linuxPackagesFor pkgs.linux_4_19);
   linuxPackages_5_3 = recurseIntoAttrs (linuxPackagesFor pkgs.linux_5_3);
+  linuxPackages_5_4 = recurseIntoAttrs (linuxPackagesFor pkgs.linux_5_4);
 
   # When adding to this list:
   # - Update linuxPackages_latest to the latest version