···

       
16
       
 
       


     

       
17
       
 
       
1.  Copy the old Nix expression (e.g. `linux-2.6.21.nix`) to the new one (e.g. `linux-2.6.22.nix`) and update it.

     

       
18
       
 
       


     

       
19
       
-
       
2.  Add the new kernel to `all-packages.nix` (e.g., create an attribute `kernel_2_6_22`).

     

       
20
       
 
       


     

       
21
       
 
       
3.  Now we’re going to update the kernel configuration. First unpack the kernel. Then for each supported platform (`i686`, `x86_64`, `uml`) do the following:

     

       
22
       
 
       


     
···

       
36
       
 
       


     

       
37
       
 
       
    5.  Copy `.config` over the new config file (e.g. `config-2.6.22-i686-smp`).

     

       
38
       
 
       


     

       
39
       
-
       
4.  Test building the kernel: `nix-build -A kernel_2_6_22`. If it compiles, ship it! For extra credit, try booting NixOS with it.

     

       
40
       
 
       


     

       
41
       
-
       
5.  It may be that the new kernel requires updating the external kernel modules and kernel-dependent packages listed in the `linuxPackagesFor` function in `all-packages.nix` (such as the NVIDIA drivers, AUFS, etc.). If the updated packages aren’t backwards compatible with older kernels, you may need to keep the older versions around.

     

···

       
16
       
 
       


     

       
17
       
 
       
1.  Copy the old Nix expression (e.g. `linux-2.6.21.nix`) to the new one (e.g. `linux-2.6.22.nix`) and update it.

     

       
18
       
 
       


     

       
19
       
+
       
2.  Add the new kernel to the `kernels` attribute set in `linux-kernels.nix` (e.g., create an attribute `kernel_2_6_22`).

     

       
20
       
 
       


     

       
21
       
 
       
3.  Now we’re going to update the kernel configuration. First unpack the kernel. Then for each supported platform (`i686`, `x86_64`, `uml`) do the following:

     

       
22
       
 
       


     
···

       
36
       
 
       


     

       
37
       
 
       
    5.  Copy `.config` over the new config file (e.g. `config-2.6.22-i686-smp`).

     

       
38
       
 
       


     

       
39
       
+
       
4.  Test building the kernel: `nix-build -A linuxKernel.kernels.kernel_2_6_22`. If it compiles, ship it! For extra credit, try booting NixOS with it.

     

       
40
       
 
       


     

       
41
       
+
       
5.  It may be that the new kernel requires updating the external kernel modules and kernel-dependent packages listed in the `linuxPackagesFor` function in `linux-kernels.nix` (such as the NVIDIA drivers, AUFS, etc.). If the updated packages aren’t backwards compatible with older kernels, you may need to keep the older versions around.