linux_6_12: patch to fix build with Rust 1.85

pkgs/os-specific/linux/kernel/linux-612-rust-185.patch

@@ -0,0 +1,13 @@
+diff --git a/drivers/gpu/drm/drm_panic_qr.rs b/drivers/gpu/drm/drm_panic_qr.rs
+index 447740d79d3d..da405d18d8a8 100644
+--- a/drivers/gpu/drm/drm_panic_qr.rs
++++ b/drivers/gpu/drm/drm_panic_qr.rs
+@@ -931,7 +931,7 @@ fn draw_all(&mut self, data: impl Iterator<Item = u8>) {
+ /// They must remain valid for the duration of the function call.
+ #[no_mangle]
+ pub unsafe extern "C" fn drm_panic_qr_generate(
+-    url: *const i8,
++    url: *const core::ffi::c_char,
+     data: *mut u8,
+     data_len: usize,
+     data_size: usize,

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

@@ -76,4 +76,9 @@
     name = "export-rt-sched-migrate";
     patch = ./export-rt-sched-migrate.patch;
   };
+
+  linux-612-rust-185 = {
+    name = "linux-612-rust-185";
+    patch = ./linux-612-rust-185.patch;
+  };
 }

pkgs/top-level/linux-kernels.nix

@@ -194,6 +194,7 @@ in {
       kernelPatches = [
         kernelPatches.bridge_stp_helper
         kernelPatches.request_key_helper
+        kernelPatches.linux-612-rust-185
       ];
     };