hosts/arael: kernel patch for GPL kernel_neon_ APIs

https://github.com/jakubgs/nixos-nanopi-r6c/issues/1
Mic92/nixpkgs@fb89d2b
openzfs/zfs#14555

Signed-off-by: Jakub Sokołowski <[email protected]>

Author: jakubgs

hosts/arael/export_neon_symbols_as_gpl.patch

@@ -0,0 +1,44 @@
+From aaeca98456431a8d9382ecf48ac4843e252c07b3 Mon Sep 17 00:00:00 2001
+From: Mark Brown <[email protected]>
+Date: Mon, 7 Nov 2022 17:07:47 +0000
+Subject: [PATCH] arm64/fpsimd: Make kernel_neon_ API _GPL
+
+Currently for reasons lost in the mists of time the kernel_neon_ APIs are
+EXPORT_SYMBOL() but the general policy for floating point usage is that it
+should be GPL only given the non-standard runtime environment that holds
+while it is in use and PCS impacts when code is compiled for FP usage.
+
+Given the limited existing deployment of non-GPL modules for arm64 and the
+fact that other architectures like x86 already make their equivalent
+functions GPL only this is not expected to be disruptive to existing users.
+
+Suggested-by: Christoph Hellwig <[email protected]>
+Signed-off-by: Mark Brown <[email protected]>
+Link: https://lore.kernel.org/r/[email protected]
+Signed-off-by: Will Deacon <[email protected]>
+---
+ arch/arm64/kernel/fpsimd.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
+index 23834d96d1e781..1fe7d65096ac66 100644
+--- a/arch/arm64/kernel/fpsimd.c
++++ b/arch/arm64/kernel/fpsimd.c
+@@ -1838,7 +1838,7 @@ void kernel_neon_begin(void)
+ 	/* Invalidate any task state remaining in the fpsimd regs: */
+ 	fpsimd_flush_cpu_state();
+ }
+-EXPORT_SYMBOL(kernel_neon_begin);
++EXPORT_SYMBOL_GPL(kernel_neon_begin);
+ 
+ /*
+  * kernel_neon_end(): give the CPU FPSIMD registers back to the current task
+@@ -1856,7 +1856,7 @@ void kernel_neon_end(void)
+ 
+ 	put_cpu_fpsimd_context();
+ }
+-EXPORT_SYMBOL(kernel_neon_end);
++EXPORT_SYMBOL_GPL(kernel_neon_end);
+ 
+ #ifdef CONFIG_EFI
+ 

hosts/arael/kernel_vanilla_6_3.nix

@@ -17,5 +17,7 @@ buildLinux (args // rec {
   kernelPatches = [
     { name = "nanopi_r6s_rk3588s";
       patch = ./nanopi_r6s_rk3588s.patch; }
+    { name = "export_neon_symbols_as_gpl";
+      patch = ./export_neon_symbols_as_gpl.patch; }
   ];
 } // (args.argsOverride or { }))

hosts/arael/sd-image.nix

@@ -39,11 +39,6 @@ in {
   services.sshd.enable = true;
   networking.firewall.enable = false;
 
-  # ZFS "GPL-incompatible module" fix:
-  # https://github.com/NixOS/nixpkgs/pull/237875
-  # https://github.com/openzfs/zfs/issues/14555
-  boot.zfs.removeLinuxDRM = true;
-
   # root autologin etc
   users.users.root.password = "root";
   services.openssh.settings.PermitRootLogin = lib.mkDefault "yes";