linux_6_15: remove

EOL upstream.

We only have one hardened kernel at the moment now because
LTS == latest available. This situation would've also happened before
the cleanup since 6.13/6.14 were removed in June already[1].

[1] 23b573705d

nixos/doc/manual/configuration/linux-kernel.chapter.md

@@ -24,6 +24,12 @@ abandoned by the kernel developers, even on stable NixOS versions. If you
 pin your kernel onto a non-longterm version, expect your evaluation to fail as
 soon as the version is out of maintenance.
 
+A kernel will be removed from nixpkgs when the first batch of stable kernels
+_after_ the final release is published. E.g. when 6.15.11 is the final release
+of the 6.15 series and is released together with 6.16.3 and 6.12.43, it will be
+removed on the release of 6.16.4 and 6.12.44. Custom kernel variants such
+as linux-hardened are also affected by this.
+
 Longterm versions of kernels will be removed before the next stable NixOS that will
 exceed the maintenance period of the kernel version.
 

nixos/tests/kernel-generic.nix

@@ -36,7 +36,6 @@ let
   kernels = pkgs.linuxKernel.vanillaPackages // {
     inherit (pkgs.linuxKernel.packages)
       linux_6_12_hardened
-      linux_6_15_hardened
       linux_rt_5_4
       linux_rt_5_10
       linux_rt_5_15

pkgs/os-specific/linux/kernel/hardened/patches.json

@@ -8,15 +8,5 @@
         },
         "sha256": "09qfpxyxi3z8cd64r2r5mxvh54a5sx8p5mk4d50y4ga2k6pa66bb",
         "version": "6.12.41"
-    },
-    "6.15": {
-        "patch": {
-            "extra": "-hardened1",
-            "name": "linux-hardened-v6.15.9-hardened1.patch",
-            "sha256": "132h0cgv8kzrlz7jprqvwcnragc2v793a759bhg0q6w3ninmncjc",
-            "url": "https://github.com/anthraxx/linux-hardened/releases/download/v6.15.9-hardened1/linux-hardened-v6.15.9-hardened1.patch"
-        },
-        "sha256": "0zcma8ycdwwzd4yci9752acsv85wh27lahclh5x2yc4jakw3lkz9",
-        "version": "6.15.9"
     }
 }

pkgs/os-specific/linux/kernel/kernels-org.json

@@ -33,11 +33,6 @@
         "hash": "sha256:1vmxywg11z946i806sg7rk7jr9px87spmwwbzjxpps2nsjybpjqg",
         "lts": true
     },
-    "6.15": {
-        "version": "6.15.11",
-        "hash": "sha256:14sxwrvw9p4ybizb8ky1rgahc62q0aw5qkmzqp3cpnavqfgldaw9",
-        "lts": false
-    },
     "6.16": {
         "version": "6.16.3",
         "hash": "sha256:118bg72mdrf75r36gki5zi18ynl2kcygrf24pwd58by1anh9nhw0",

pkgs/top-level/linux-kernels.nix

@@ -210,14 +210,6 @@ in
           ];
         };
 
-        linux_6_15 = callPackage ../os-specific/linux/kernel/mainline.nix {
-          branch = "6.15";
-          kernelPatches = [
-            kernelPatches.bridge_stp_helper
-            kernelPatches.request_key_helper
-          ];
-        };
-
         linux_6_16 = callPackage ../os-specific/linux/kernel/mainline.nix {
           branch = "6.16";
           kernelPatches = [
@@ -295,7 +287,6 @@ in
         linux_latest_libre = deblobKernel packageAliases.linux_latest.kernel;
 
         linux_6_12_hardened = hardenedKernelFor kernels.linux_6_12 { };
-        linux_6_15_hardened = hardenedKernelFor kernels.linux_6_15 { };
 
         linux_hardened = hardenedKernelFor packageAliases.linux_default.kernel { };
       }
@@ -306,6 +297,7 @@ in
         linux_6_11 = throw "linux 6.11 was removed because it has reached its end of life upstream";
         linux_6_13 = throw "linux 6.13 was removed because it has reached its end of life upstream";
         linux_6_14 = throw "linux 6.14 was removed because it has reached its end of life upstream";
+        linux_6_15 = throw "linux 6.15 was removed because it has reached its end of life upstream";
 
         linux_5_10_hardened = throw "linux_hardened on nixpkgs only contains latest stable and latest LTS";
         linux_5_15_hardened = throw "linux_hardened on nixpkgs only contains latest stable and latest LTS";
@@ -319,6 +311,7 @@ in
         linux_6_11_hardened = throw "linux 6.11 was removed because it has reached its end of life upstream";
         linux_6_13_hardened = throw "linux 6.13 was removed because it has reached its end of life upstream";
         linux_6_14_hardened = throw "linux 6.14 was removed because it has reached its end of life upstream";
+        linux_6_15_hardened = throw "linux 6.15 was removed because it has reached its end of life upstream";
 
         linux_ham = throw "linux_ham has been removed in favour of the standard kernel packages";
       }
@@ -738,7 +731,6 @@ in
     linux_6_1 = recurseIntoAttrs (packagesFor kernels.linux_6_1);
     linux_6_6 = recurseIntoAttrs (packagesFor kernels.linux_6_6);
     linux_6_12 = recurseIntoAttrs (packagesFor kernels.linux_6_12);
-    linux_6_15 = recurseIntoAttrs (packagesFor kernels.linux_6_15);
     linux_6_16 = recurseIntoAttrs (packagesFor kernels.linux_6_16);
   }
   // lib.optionalAttrs config.allowAliases {
@@ -748,6 +740,7 @@ in
     linux_6_11 = throw "linux 6.11 was removed because it reached its end of life upstream"; # Added 2025-03-23
     linux_6_13 = throw "linux 6.13 was removed because it reached its end of life upstream"; # Added 2025-06-22
     linux_6_14 = throw "linux 6.14 was removed because it reached its end of life upstream"; # Added 2025-06-22
+    linux_6_15 = throw "linux 6.15 was removed because it reached its end of life upstream"; # Added 2025-08-23
   };
 
   rtPackages = {
@@ -778,7 +771,6 @@ in
       linux_hardened = recurseIntoAttrs (packagesFor kernels.linux_hardened);
 
       linux_6_12_hardened = recurseIntoAttrs (packagesFor kernels.linux_6_12_hardened);
-      linux_6_15_hardened = recurseIntoAttrs (packagesFor kernels.linux_6_15_hardened);
 
       linux_zen = recurseIntoAttrs (packagesFor kernels.linux_zen);
       linux_lqx = recurseIntoAttrs (packagesFor kernels.linux_lqx);
@@ -805,6 +797,7 @@ in
       linux_6_11_hardened = throw "linux 6.11 was removed because it has reached its end of life upstream";
       linux_6_13_hardened = throw "linux 6.13 was removed because it has reached its end of life upstream";
       linux_6_14_hardened = throw "linux 6.14 was removed because it has reached its end of life upstream";
+      linux_6_15_hardened = throw "linux 6.15 was removed because it has reached its end of life upstream";
       linux_ham = throw "linux_ham has been removed in favour of the standard kernel packages";
     }
   );