nixpkgs patch to build fewer kernel things

nixpkgs patch to build fewer kernel things.patch

From 283f99d20990d094d74ac60b98e082a16511389b Mon Sep 17 00:00:00 2001
From: Ivan Kozik <[email protected]>
Date: Fri, 12 May 2023 02:18:33 +0000
Subject: [PATCH] linux/common-config: don't build things that we'll never use

---
 .../linux/kernel/common-config.nix            | 114 ++----------------
 1 file changed, 8 insertions(+), 106 deletions(-)

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index 6e704e2ad2ab..1fc5fd3858be 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -176,18 +176,12 @@ let
       NET_CLS_BPF                 = module;
       NET_ACT_BPF                 = module;
       NET_SCHED                   = yes;
-      L2TP_V3                     = yes;
-      L2TP_IP                     = module;
-      L2TP_ETH                    = module;
       BRIDGE_VLAN_FILTERING       = yes;
       BONDING                     = module;
       NET_L3_MASTER_DEV           = option yes;
       NET_FOU_IP_TUNNELS          = option yes;
       IP_NF_TARGET_REDIRECT       = module;

-      PPP_MULTILINK = yes; # PPP multilink support
-      PPP_FILTER    = yes;
-
       # needed for iwd WPS support (wpa_supplicant replacement)
       KEY_DH_OPERATIONS = yes;

@@ -231,19 +225,9 @@ let
       INET_RAW_DIAG     = mkDefault module;
       INET_DIAG_DESTROY = mkDefault yes;

-      # enable multipath-tcp
-      MPTCP           = whenAtLeast "5.6" yes;
-      MPTCP_IPV6      = whenAtLeast "5.6" yes;
-      INET_MPTCP_DIAG = whenAtLeast "5.9" (mkDefault module);
-
       # Kernel TLS
       TLS         = module;
       TLS_DEVICE  = whenAtLeast "4.18" yes;
-
-      # infiniband
-      INFINIBAND = module;
-      INFINIBAND_IPOIB = module;
-      INFINIBAND_IPOIB_CM = yes;
     };

     wireless = {
@@ -265,14 +249,6 @@ let
       FB                  = yes;
       FB_EFI              = yes;
       FB_NVIDIA_I2C       = yes; # Enable DDC Support
-      FB_RIVA_I2C         = yes;
-      FB_ATY_CT           = yes; # Mach64 CT/VT/GT/LT (incl. 3D RAGE) support
-      FB_ATY_GX           = yes; # Mach64 GX support
-      FB_SAVAGE_I2C       = yes;
-      FB_SAVAGE_ACCEL     = yes;
-      FB_SIS_300          = yes;
-      FB_SIS_315          = yes;
-      FB_3DFX_ACCEL       = yes;
       FB_VESA             = yes;
       FRAMEBUFFER_CONSOLE = yes;
       FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER = whenAtLeast "4.19" yes;
@@ -410,12 +386,12 @@ let
       TMPFS_POSIX_ACL = yes;
       FS_ENCRYPTION   = if (versionAtLeast version "5.1") then yes else option module;

-      EXT2_FS_XATTR     = yes;
-      EXT2_FS_POSIX_ACL = yes;
-      EXT2_FS_SECURITY  = yes;
-
-      EXT3_FS_POSIX_ACL = yes;
-      EXT3_FS_SECURITY  = yes;
+      EXT2_FS = no;
+      EXT3_FS = no;
+      REISERFS_FS = no;
+      JFS_FS = no;
+      XFS_FS = no;
+      F2FS_FS = no;

       EXT4_FS_POSIX_ACL = yes;
       EXT4_FS_SECURITY  = yes;
@@ -425,28 +401,12 @@ let
       NTFS3_LZX_XPRESS   = whenAtLeast "5.15" yes;
       NTFS3_FS_POSIX_ACL = whenAtLeast "5.15" yes;

-      REISERFS_FS_XATTR     = option yes;
-      REISERFS_FS_POSIX_ACL = option yes;
-      REISERFS_FS_SECURITY  = option yes;
-
-      JFS_POSIX_ACL = option yes;
-      JFS_SECURITY  = option yes;
-
-      XFS_QUOTA     = option yes;
-      XFS_POSIX_ACL = option yes;
-      XFS_RT        = option yes; # XFS Realtime subvolume support
-      XFS_ONLINE_SCRUB = option yes;
-
       OCFS2_DEBUG_MASKLOG = option no;

       BTRFS_FS_POSIX_ACL = yes;

       UBIFS_FS_ADVANCED_COMPR = option yes;

-      F2FS_FS             = module;
-      F2FS_FS_SECURITY    = option yes;
-      F2FS_FS_ENCRYPTION  = whenOlder "5.1" yes;
-      F2FS_FS_COMPRESSION = whenAtLeast "5.6" yes;
       UDF_FS              = module;

       NFSD_V2_ACL            = whenOlder "6.2" yes;
@@ -471,9 +431,6 @@ let
       CIFS_ACL          = whenOlder "5.3" yes;
       CIFS_DFS_UPCALL   = yes;

-      CEPH_FSCACHE      = yes;
-      CEPH_FS_POSIX_ACL = yes;
-
       SQUASHFS_FILE_DIRECT         = yes;
       SQUASHFS_DECOMP_MULTI_PERCPU = whenOlder "6.2" yes;
       SQUASHFS_XATTR               = yes;
@@ -581,9 +538,7 @@ let
     };

     staging = {
-      # Enable staging drivers.  These are somewhat experimental, but
-      # they generally don't hurt.
-      STAGING = yes;
+
     };

     proc-events = {
@@ -619,10 +574,7 @@ let
       KVM_GUEST                         = yes;
       KVM_MMIO                          = yes;
       KVM_VFIO                          = yes;
-      KSM = yes;
       VIRT_DRIVERS = yes;
-      # We need 64 GB (PAE) support for Xen guest support
-      HIGHMEM64G = { optional = true; tristate = mkIf (!stdenv.is64bit) "y";};

       VFIO_PCI_VGA = mkIf stdenv.is64bit yes;

@@ -632,37 +584,15 @@ let
       VBOXGUEST = option no;
       DRM_VBOXVIDEO = option no;

-      XEN                         = option yes;
-      XEN_DOM0                    = option yes;
-      PCI_XEN                     = option yes;
-      HVC_XEN                     = option yes;
-      HVC_XEN_FRONTEND            = option yes;
-      XEN_SYS_HYPERVISOR          = option yes;
-      SWIOTLB_XEN                 = option yes;
-      XEN_BACKEND                 = option yes;
-      XEN_BALLOON                 = option yes;
-      XEN_BALLOON_MEMORY_HOTPLUG  = option yes;
-      XEN_EFI                     = option yes;
-      XEN_HAVE_PVMMU              = option yes;
-      XEN_MCE_LOG                 = option yes;
-      XEN_PVH                     = option yes;
-      XEN_PVHVM                   = option yes;
-      XEN_SAVE_RESTORE            = option yes;
-      XEN_SCRUB_PAGES             = whenOlder "4.19" yes;
-      XEN_SELFBALLOONING          = whenOlder "5.3" yes;
-
       # Enable device detection on virtio-mmio hypervisors
       VIRTIO_MMIO_CMDLINE_DEVICES = yes;
     };

     media = {
-      MEDIA_DIGITAL_TV_SUPPORT = yes;
       MEDIA_CAMERA_SUPPORT     = yes;
       MEDIA_CONTROLLER         = yes;
       MEDIA_PCI_SUPPORT        = yes;
       MEDIA_USB_SUPPORT        = yes;
-      MEDIA_ANALOG_TV_SUPPORT  = yes;
-      VIDEO_STK1160_COMMON     = module;
     };

     "9p" = {
@@ -823,10 +753,6 @@ let
       AIC7XXX_DEBUG_ENABLE = no;
       AIC94XX_DEBUG = no;

-      BLK_DEV_INTEGRITY       = yes;
-
-      BLK_SED_OPAL = yes;
-
       BSD_PROCESS_ACCT_V3 = yes;

       SERIAL_DEV_BUS = yes; # enables support for serial devices
@@ -847,8 +773,6 @@ let
       CLEANCACHE = whenOlder "5.17" (option yes);
       CRASH_DUMP = option no;

-      DVB_DYNAMIC_MINORS = option yes; # we use udev
-
       EFI_STUB            = yes; # EFI bootloader in the bzImage itself
       EFI_GENERIC_STUB_INITRD_CMDLINE_LOADER =
           whenOlder "6.2" (whenAtLeast "5.8" yes); # initrd kernel parameter for EFI
@@ -878,7 +802,6 @@ let
       LDM_PARTITION         = yes;
       LOGIRUMBLEPAD2_FF     = yes; # Logitech Rumblepad 2 force feedback
       LOGO                  = no; # not needed
-      MEDIA_ATTACH          = yes;
       MEGARAID_NEWGEN       = yes;

       MLX5_CORE_EN       = option yes;
@@ -918,9 +841,6 @@ let
       SLAB_FREELIST_HARDENED = yes;
       SLAB_FREELIST_RANDOM   = yes;

-      SLIP_COMPRESSED = yes; # CSLIP compressed headers
-      SLIP_SMART      = yes;
-
       HWMON         = yes;
       THERMAL_HWMON = yes; # Hardware monitoring support
       NVME_HWMON    = whenAtLeast "5.5" yes; # NVMe drives temperature reporting
@@ -966,12 +886,6 @@ let

       FSL_MC_UAPI_SUPPORT = mkIf (stdenv.hostPlatform.system == "aarch64-linux") (whenAtLeast "5.12" yes);

-      ASHMEM =                 { optional = true; tristate = whenBetween "5.0" "5.18" "y";};
-      ANDROID =                { optional = true; tristate = whenBetween "5.0" "5.19" "y";};
-      ANDROID_BINDER_IPC =     { optional = true; tristate = whenAtLeast "5.0" "y";};
-      ANDROID_BINDERFS =       { optional = true; tristate = whenAtLeast "5.0" "y";};
-      ANDROID_BINDER_DEVICES = { optional = true; freeform = whenAtLeast "5.0" "binder,hwbinder,vndbinder";};
-
       TASKSTATS = yes;
       TASK_DELAY_ACCT = yes;
       TASK_XACCT = yes;
@@ -1009,21 +923,9 @@ let
       FB_SIMPLE = yes;

     } // optionalAttrs (versionAtLeast version "5.4" && (stdenv.hostPlatform.system == "x86_64-linux" || stdenv.hostPlatform.system == "aarch64-linux")) {
-      # Required for various hardware features on Chrome OS devices
-      CHROME_PLATFORMS = yes;
-      CHROMEOS_TBMC = module;
-
-      CROS_EC = module;

-      CROS_EC_I2C = module;
-      CROS_EC_SPI = module;
-      CROS_EC_LPC = module;
-      CROS_EC_ISHTP = module;
-
-      CROS_KBD_LED_BACKLIGHT = module;
     } // optionalAttrs (versionAtLeast version "5.4" && stdenv.hostPlatform.system == "x86_64-linux") {
-      CHROMEOS_LAPTOP = module;
-      CHROMEOS_PSTORE = module;
+
     };
   };
 in
--
2.40.1

Size reduction (Linux 6.1.28 is my first build with this patch)

-rwxr-xr-x 1 root root  8,652,096 2023-05-12 15:56 kwscica7hjdhphsabk3a3l84x4y54an4-linux-6.1.27-bzImage.efi*
-rwxr-xr-x 1 root root  8,255,840 2023-05-12 15:56 k60307ilj67x3sslpppgal3z06gkf9a1-linux-6.1.28-bzImage.efi*