Use rustc directly instead of cargo

This is a big PR, but most of it is interdependent to the rest.

  - Shared Rust infrastructure: `libkernel`, `libmodule`, `libcore`,
    `liballoc`, `libcompiler_builtins`.

      + The Rust modules are now much smaller since they do not contain
        several copies of those libraries. Our example `.ko` on release
        is just 12 KiB, down from 1.3 MiB. For reference:

            `vmlinux` on release w/  Rust is 23 MiB (compressed: 2.1 MiB)
            `vmlinux` on release w/o Rust is 22 MiB (compressed: 1.9 MiB)

        i.e. the bulk is now shared.

      + Multiple builtin modules are now supported since their symbols
        do not collide against each other (fixes #9).

      + Faster compilation (less crates to compile & less repetition).

      + We achieve this by compiling all the shared code to `.rlib`s
        (and the `.so` for the proc macro). For loadable modules,
        we need to rely on the upcoming v0 Rust mangling scheme,
        plus we need to export the Rust symbols needed by the `.ko`s.

  - Simpler, flat file structure: now a small driver may only need
    a single file like `drivers/char/rust_example.rs`, like in C.

      + All the `rust/*` and `driver/char/rust_example/*` files moved
        to fit in the new structure: less files around.

  - Only `rust-lang/{rust,rust-bindgen,compiler-builtins}` as dependencies.

      + Also helps with the faster compilation.

  - Dependency handling integration with `Kbuild`/`fixdep`.

      + Changes to the Rust standard library, kernel headers (bindings),
        `rust/` source files, `.rs` changes, etc. all trigger
        recompilation of the proper things.

      + Works as expected with parallel support (`-j`).

  - Proper `make clean` support.

  - Offline builds by default (there is no "online compilation" anymore;
    fixes #17).

  - No more interleaved Cargo output (fixes #29).

  - One less nightly dependency (Cargo's `build-std`); since now we manage
    the cross-compilation ourselves (should fix #27).

  - Since now a kernel can be "Rust-enabled", a new `CONFIG_RUST` option
    is added to enable/disable it manually, regardless of whether one has
    `rustc` available or not (`CONFIG_HAS_RUST`).

  - Improved handling of `rustc` flags (`opt-level`, `debuginfo`, etc.),
    following what the user selected for C (no Cargo profiles).

  - Added Kconfig menu for tweaking `rustc` options, like overflow checks.

  - This rewrite of the Kbuild support is cleaner, i.e. less hacks
    in general handling paths (e.g. no more `shell readlink` for `O=`).

  - Duplicated the example driver 3 times so that we can test in the CI
    that 2 builtins and 2 loadables work, all at the same time.

  - Updated the quick start guide.

  - Updated CI `.config`s:

      + Add the new options and test with 2 builtins and 2 loadables.
        At the same time, remove the matrix test for builtin/loadable.

      + Debug: more things enabled (debuginfo, kgdb, unit testing, etc.)
        that mimic more what a developer would have. Running the CI
        will be slightly slower, but should be OK.

      + Release: disabled `EXPERT` and changed a few things to make it
        look more like a normal configuration.

      + Also update both configs to v5.9 while I was at it.

    (I could have split a few of these ones off into another PR,
    but anyway it is for the CI only and I had already done it).

  - Less `extern crate`s needed since we pass it via `rustc`
    (closer to idiomatic 2018 edition Rust code).

Things to note:

  - There is one more nightly feature used (the new Rust mangling scheme),
    but we know that one will be stable (and the default one, later on).

  - The hack at `exports.c` to export symbols to loadable modules.

  - The hack at `allocator.rs` to get the `__rust_*()` functions.

Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

.github/workflows/ci.yaml

@@ -11,7 +11,6 @@ jobs:
     strategy:
       matrix:
         mode: [debug, release]
-        module: [builtin, loadable]
         outputdir: [src, build]
 
     steps:
@@ -22,13 +21,11 @@ jobs:
       - run: rustup default nightly-2020-08-27
       - run: rustup component add rustfmt
       - run: rustup component add rust-src
+      - run: git clone --depth 1 --branch 0.1.36 https://github.com/rust-lang/compiler-builtins.git $(rustc --print sysroot)/lib/rustlib/src/compiler-builtins
 
       # Build
       - run: cp .github/workflows/kernel-${{ matrix.mode }}.config .config
 
-      - if: matrix.module == 'loadable'
-        run: sed -i -E 's/^(CONFIG_RUST_EXAMPLE=)(y)$/\1m/g' .config
-
       - if: matrix.outputdir == 'build'
         run: mkdir build && mv .config build/.config
 
@@ -38,9 +35,6 @@ jobs:
         run: make O=build CC=clang-10 LLVM_CONFIG_PATH=llvm-config-10 -j3
 
       # Run
-      - if: matrix.module == 'builtin'
-        run: sed -i '/rust_example/d' .github/workflows/qemu-initramfs.desc
-
       - if: matrix.outputdir == 'build'
         run: sed -i 's:drivers/:build/drivers/:' .github/workflows/qemu-initramfs.desc
 
@@ -50,28 +44,31 @@ jobs:
         run: build/usr/gen_init_cpio .github/workflows/qemu-initramfs.desc > qemu-initramfs.img
 
       - if: matrix.outputdir == 'src'
-        run: qemu-system-x86_64 -kernel       arch/x86/boot/bzImage -initrd qemu-initramfs.img -cpu Cascadelake-Server -smp 2 -nographic -no-reboot -append "console=ttyS0 ${{ matrix.module == 'builtin' && 'rust_example.my_i32=123321' || '' }}" | tee qemu-stdout.log
+        run: qemu-system-x86_64 -kernel       arch/x86/boot/bzImage -initrd qemu-initramfs.img -cpu Cascadelake-Server -smp 2 -nographic -no-reboot -append "console=ttyS0 rust_example.my_i32=123321 rust_example_2.my_i32=234432" | tee qemu-stdout.log
       - if: matrix.outputdir == 'build'
-        run: qemu-system-x86_64 -kernel build/arch/x86/boot/bzImage -initrd qemu-initramfs.img -cpu Cascadelake-Server -smp 2 -nographic -no-reboot -append "console=ttyS0 ${{ matrix.module == 'builtin' && 'rust_example.my_i32=123321' || '' }}" | tee qemu-stdout.log
+        run: qemu-system-x86_64 -kernel build/arch/x86/boot/bzImage -initrd qemu-initramfs.img -cpu Cascadelake-Server -smp 2 -nographic -no-reboot -append "console=ttyS0 rust_example.my_i32=123321 rust_example_2.my_i32=234432" | tee qemu-stdout.log
 
       # Check
-      - run: grep -F 'Rust Example (init)' qemu-stdout.log
-      - run: "grep 'my_i32: \\+123321' qemu-stdout.log"
-      - if: matrix.module == 'loadable'
-        run: grep -F 'Rust Example (exit)' qemu-stdout.log
+      - run: grep -F     '] Rust Example (init)' qemu-stdout.log
+      - run: grep -F '] [2] Rust Example (init)' qemu-stdout.log
+      - run: grep -F '] [3] Rust Example (init)' qemu-stdout.log
+      - run: grep -F '] [4] Rust Example (init)' qemu-stdout.log
 
-      # Report
-      - if: matrix.outputdir == 'src' && matrix.module == 'loadable'
-        run: ls -l       drivers/char/rust_example/rust_example.ko
-      - if: matrix.outputdir == 'build' && matrix.module == 'loadable'
-        run: ls -l build/drivers/char/rust_example/rust_example.ko
+      - run: "grep -F     ']   my_i32:   123321' qemu-stdout.log"
+      - run: "grep -F '] [2]   my_i32:   234432' qemu-stdout.log"
+      - run: "grep -F '] [3]   my_i32:   345543' qemu-stdout.log"
+      - run: "grep -F '] [4]   my_i32:   456654' qemu-stdout.log"
 
+      - run: grep -F '] [3] Rust Example (exit)' qemu-stdout.log
+      - run: grep -F '] [4] Rust Example (exit)' qemu-stdout.log
+
+      # Report
       - if: matrix.outputdir == 'src'
-        run: ls -l       vmlinux       arch/x86/boot/bzImage
+        run: ls -l       drivers/char/rust_example.o       drivers/char/rust_example_3.ko       rust/*.o       vmlinux       arch/x86/boot/bzImage
       - if: matrix.outputdir == 'build'
-        run: ls -l build/vmlinux build/arch/x86/boot/bzImage
+        run: ls -l build/drivers/char/rust_example.o build/drivers/char/rust_example_3.ko build/rust/*.o build/vmlinux build/arch/x86/boot/bzImage
 
       - if: matrix.outputdir == 'src'
-        run: size        vmlinux
+        run: size        drivers/char/rust_example.o       drivers/char/rust_example_3.ko       rust/*.o       vmlinux
       - if: matrix.outputdir == 'build'
-        run: size  build/vmlinux
+        run: size  build/drivers/char/rust_example.o build/drivers/char/rust_example_3.ko build/rust/*.o build/vmlinux

.github/workflows/kernel-debug.config

@@ -1,18 +1,21 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 5.9.0-rc2 Kernel Configuration
+# Linux/x86 5.9.0 Kernel Configuration
 #
 CONFIG_CC_VERSION_TEXT="clang version 10.0.1"
 CONFIG_GCC_VERSION=0
 CONFIG_LD_VERSION=230000000
 CONFIG_CC_IS_CLANG=y
+CONFIG_LD_IS_LLD=y
 CONFIG_CLANG_VERSION=100001
 CONFIG_HAS_RUST=y
 CONFIG_RUSTC_VERSION=14800
-CONFIG_CARGO_VERSION=14800
 CONFIG_CC_CAN_LINK=y
 CONFIG_CC_CAN_LINK_STATIC=y
 CONFIG_CC_HAS_ASM_GOTO=y
+CONFIG_CC_HAS_ASM_GOTO_OUTPUT=y
+CONFIG_TOOLS_SUPPORT_RELR=y
+CONFIG_CC_HAS_ASM_INLINE=y
 CONFIG_CONSTRUCTORS=y
 CONFIG_IRQ_WORK=y
 CONFIG_BUILDTIME_TABLE_SORT=y
@@ -199,10 +202,11 @@ CONFIG_SLUB=y
 # CONFIG_SLOB is not set
 # CONFIG_SLAB_MERGE_DEFAULT is not set
 # CONFIG_SLAB_FREELIST_RANDOM is not set
-# CONFIG_SLAB_FREELIST_HARDENED is not set
+CONFIG_SLAB_FREELIST_HARDENED=y
 # CONFIG_SHUFFLE_PAGE_ALLOCATOR is not set
 CONFIG_SLUB_CPU_PARTIAL=y
 # CONFIG_PROFILING is not set
+CONFIG_RUST=y
 CONFIG_TRACEPOINTS=y
 # end of General setup
 
@@ -328,13 +332,8 @@ CONFIG_HZ=1000
 # CONFIG_KEXEC is not set
 # CONFIG_CRASH_DUMP is not set
 CONFIG_PHYSICAL_START=0x1000000
-CONFIG_RELOCATABLE=y
-CONFIG_RANDOMIZE_BASE=y
-CONFIG_X86_NEED_RELOCS=y
+# CONFIG_RELOCATABLE is not set
 CONFIG_PHYSICAL_ALIGN=0x200000
-CONFIG_DYNAMIC_MEMORY_LAYOUT=y
-CONFIG_RANDOMIZE_MEMORY=y
-CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING=0x0
 CONFIG_HOTPLUG_CPU=y
 # CONFIG_BOOTPARAM_HOTPLUG_CPU0 is not set
 # CONFIG_DEBUG_HOTPLUG_CPU0 is not set
@@ -349,7 +348,6 @@ CONFIG_HAVE_LIVEPATCH=y
 CONFIG_ARCH_HAS_ADD_PAGES=y
 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
 CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK=y
-CONFIG_ARCH_ENABLE_THP_MIGRATION=y
 
 #
 # Power management and ACPI options
@@ -554,9 +552,7 @@ CONFIG_PHYS_ADDR_T_64BIT=y
 CONFIG_VIRT_TO_BUS=y
 # CONFIG_KSM is not set
 CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
-CONFIG_TRANSPARENT_HUGEPAGE=y
-CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y
-# CONFIG_TRANSPARENT_HUGEPAGE_MADVISE is not set
+# CONFIG_TRANSPARENT_HUGEPAGE is not set
 CONFIG_ARCH_WANTS_THP_SWAP=y
 # CONFIG_CLEANCACHE is not set
 # CONFIG_CMA is not set
@@ -603,7 +599,9 @@ CONFIG_PREVENT_FIRMWARE_BUILD=y
 # CONFIG_DEBUG_DRIVER is not set
 # CONFIG_DEBUG_DEVRES is not set
 # CONFIG_DEBUG_TEST_DRIVER_REMOVE is not set
+# CONFIG_PM_QOS_KUNIT_TEST is not set
 # CONFIG_TEST_ASYNC_DRIVER_PROBE is not set
+# CONFIG_KUNIT_DRIVER_PE_TEST is not set
 CONFIG_GENERIC_CPU_AUTOPROBE=y
 CONFIG_GENERIC_CPU_VULNERABILITIES=y
 # end of Generic Driver Options
@@ -736,9 +734,11 @@ CONFIG_SERIAL_8250_RUNTIME_UARTS=1
 #
 # Non-8250 serial port support
 #
+# CONFIG_SERIAL_KGDB_NMI is not set
 # CONFIG_SERIAL_UARTLITE is not set
 CONFIG_SERIAL_CORE=y
 CONFIG_SERIAL_CORE_CONSOLE=y
+CONFIG_CONSOLE_POLL=y
 # CONFIG_SERIAL_LANTIQ is not set
 # CONFIG_SERIAL_SCCNXP is not set
 # CONFIG_SERIAL_ALTERA_JTAGUART is not set
@@ -763,6 +763,9 @@ CONFIG_SERIAL_CORE_CONSOLE=y
 # CONFIG_TCG_TPM is not set
 # CONFIG_TELCLOCK is not set
 CONFIG_RUST_EXAMPLE=y
+CONFIG_RUST_EXAMPLE_2=y
+CONFIG_RUST_EXAMPLE_3=m
+CONFIG_RUST_EXAMPLE_4=m
 # end of Character devices
 
 # CONFIG_RANDOM_TRUST_BOOTLOADER is not set
@@ -1093,11 +1096,11 @@ CONFIG_LSM="lockdown,yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,appar
 #
 CONFIG_CC_HAS_AUTO_VAR_INIT_PATTERN=y
 CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO=y
-CONFIG_INIT_STACK_NONE=y
-# CONFIG_INIT_STACK_ALL_PATTERN is not set
+# CONFIG_INIT_STACK_NONE is not set
+CONFIG_INIT_STACK_ALL_PATTERN=y
 # CONFIG_INIT_STACK_ALL_ZERO is not set
-# CONFIG_INIT_ON_ALLOC_DEFAULT_ON is not set
-# CONFIG_INIT_ON_FREE_DEFAULT_ON is not set
+CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y
+CONFIG_INIT_ON_FREE_DEFAULT_ON=y
 # end of Memory initialization
 # end of Kernel hardening options
 # end of Security options
@@ -1137,7 +1140,6 @@ CONFIG_CRC32_SLICEBY8=y
 # CONFIG_CRC8 is not set
 # CONFIG_RANDOM32_SELFTEST is not set
 # CONFIG_XZ_DEC is not set
-CONFIG_XARRAY_MULTI=y
 CONFIG_HAS_IOMEM=y
 CONFIG_HAS_IOPORT_MAP=y
 CONFIG_HAS_DMA=y
@@ -1146,6 +1148,7 @@ CONFIG_NEED_DMA_MAP_STATE=y
 CONFIG_ARCH_DMA_ADDR_T_64BIT=y
 CONFIG_SWIOTLB=y
 # CONFIG_DMA_API_DEBUG is not set
+# CONFIG_CPUMASK_OFFSTACK is not set
 CONFIG_GLOB=y
 # CONFIG_GLOB_SELFTEST is not set
 # CONFIG_IRQ_POLL is not set
@@ -1184,36 +1187,53 @@ CONFIG_DEBUG_BUGVERBOSE=y
 #
 # Compile-time checks and compiler options
 #
-# CONFIG_DEBUG_INFO is not set
+CONFIG_DEBUG_INFO=y
+# CONFIG_DEBUG_INFO_REDUCED is not set
+# CONFIG_DEBUG_INFO_COMPRESSED is not set
+# CONFIG_DEBUG_INFO_SPLIT is not set
+CONFIG_DEBUG_INFO_DWARF4=y
+# CONFIG_DEBUG_INFO_BTF is not set
+# CONFIG_GDB_SCRIPTS is not set
 CONFIG_ENABLE_MUST_CHECK=y
 CONFIG_FRAME_WARN=2048
 # CONFIG_STRIP_ASM_SYMS is not set
-# CONFIG_READABLE_ASM is not set
+CONFIG_READABLE_ASM=y
 # CONFIG_HEADERS_INSTALL is not set
 # CONFIG_DEBUG_SECTION_MISMATCH is not set
 # CONFIG_SECTION_MISMATCH_WARN_ONLY is not set
-# CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B is not set
+CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B=y
 CONFIG_STACK_VALIDATION=y
+CONFIG_VMLINUX_VALIDATION=y
 # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
 # end of Compile-time checks and compiler options
 
 #
 # Generic Kernel Debugging Instruments
 #
-# CONFIG_MAGIC_SYSRQ is not set
+CONFIG_MAGIC_SYSRQ=y
+CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1
+CONFIG_MAGIC_SYSRQ_SERIAL=y
+CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE=""
 CONFIG_DEBUG_FS=y
 # CONFIG_DEBUG_FS_ALLOW_ALL is not set
 # CONFIG_DEBUG_FS_DISALLOW_MOUNT is not set
 CONFIG_DEBUG_FS_ALLOW_NONE=y
 CONFIG_HAVE_ARCH_KGDB=y
-# CONFIG_KGDB is not set
+CONFIG_KGDB=y
+CONFIG_KGDB_SERIAL_CONSOLE=y
+# CONFIG_KGDB_TESTS is not set
+# CONFIG_KGDB_LOW_LEVEL_TRAP is not set
+# CONFIG_KGDB_KDB is not set
+CONFIG_ARCH_HAS_EARLY_DEBUG=y
 CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y
 CONFIG_UBSAN=y
 CONFIG_UBSAN_TRAP=y
 CONFIG_UBSAN_BOUNDS=y
 CONFIG_UBSAN_MISC=y
 CONFIG_UBSAN_SANITIZE_ALL=y
 # CONFIG_TEST_UBSAN is not set
+CONFIG_HAVE_ARCH_KCSAN=y
+CONFIG_HAVE_KCSAN_COMPILER=y
 # end of Generic Kernel Debugging Instruments
 
 CONFIG_DEBUG_KERNEL=y
@@ -1252,18 +1272,18 @@ CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE=16000
 # CONFIG_DEBUG_KMEMLEAK_TEST is not set
 # CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF is not set
 CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN=y
-# CONFIG_DEBUG_STACK_USAGE is not set
+CONFIG_DEBUG_STACK_USAGE=y
 CONFIG_SCHED_STACK_END_CHECK=y
 CONFIG_ARCH_HAS_DEBUG_VM_PGTABLE=y
 CONFIG_DEBUG_VM=y
 CONFIG_DEBUG_VM_VMACACHE=y
 CONFIG_DEBUG_VM_RB=y
 CONFIG_DEBUG_VM_PGFLAGS=y
-# CONFIG_DEBUG_VM_PGTABLE is not set
+CONFIG_DEBUG_VM_PGTABLE=y
 CONFIG_ARCH_HAS_DEBUG_VIRTUAL=y
 CONFIG_DEBUG_VIRTUAL=y
 CONFIG_DEBUG_MEMORY_INIT=y
-# CONFIG_DEBUG_PER_CPU_MAPS is not set
+CONFIG_DEBUG_PER_CPU_MAPS=y
 CONFIG_HAVE_ARCH_KASAN=y
 CONFIG_HAVE_ARCH_KASAN_VMALLOC=y
 CONFIG_CC_HAS_KASAN_GENERIC=y
@@ -1348,7 +1368,7 @@ CONFIG_DEBUG_NOTIFIERS=y
 CONFIG_BUG_ON_DATA_CORRUPTION=y
 # end of Debug kernel data structures
 
-# CONFIG_DEBUG_CREDENTIALS is not set
+CONFIG_DEBUG_CREDENTIALS=y
 
 #
 # RCU Debugging
@@ -1384,7 +1404,6 @@ CONFIG_TRACING=y
 CONFIG_TRACING_SUPPORT=y
 # CONFIG_FTRACE is not set
 # CONFIG_SAMPLES is not set
-CONFIG_HAVE_ARCH_KCSAN=y
 CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
 # CONFIG_STRICT_DEVMEM is not set
 
@@ -1404,7 +1423,7 @@ CONFIG_HAVE_MMIOTRACE_SUPPORT=y
 CONFIG_IO_DELAY_NONE=y
 # CONFIG_DEBUG_BOOT_PARAMS is not set
 # CONFIG_CPA_DEBUG is not set
-# CONFIG_DEBUG_ENTRY is not set
+CONFIG_DEBUG_ENTRY=y
 # CONFIG_DEBUG_NMI_SELFTEST is not set
 # CONFIG_X86_DEBUG_FPU is not set
 CONFIG_UNWINDER_ORC=y
@@ -1414,13 +1433,64 @@ CONFIG_UNWINDER_ORC=y
 #
 # Kernel Testing and Coverage
 #
-# CONFIG_KUNIT is not set
+CONFIG_KUNIT=y
+# CONFIG_KUNIT_DEBUGFS is not set
+# CONFIG_KUNIT_TEST is not set
+# CONFIG_KUNIT_EXAMPLE_TEST is not set
+# CONFIG_KUNIT_ALL_TESTS is not set
 # CONFIG_NOTIFIER_ERROR_INJECTION is not set
 # CONFIG_FAULT_INJECTION is not set
 CONFIG_ARCH_HAS_KCOV=y
 CONFIG_CC_HAS_SANCOV_TRACE_PC=y
 # CONFIG_KCOV is not set
-# CONFIG_RUNTIME_TESTING_MENU is not set
+CONFIG_RUNTIME_TESTING_MENU=y
+# CONFIG_LKDTM is not set
+# CONFIG_TEST_LIST_SORT is not set
+# CONFIG_TEST_MIN_HEAP is not set
+# CONFIG_TEST_SORT is not set
+# CONFIG_BACKTRACE_SELF_TEST is not set
+# CONFIG_RBTREE_TEST is not set
+# CONFIG_REED_SOLOMON_TEST is not set
+# CONFIG_INTERVAL_TREE_TEST is not set
+# CONFIG_PERCPU_TEST is not set
+# CONFIG_ATOMIC64_SELFTEST is not set
+# CONFIG_TEST_HEXDUMP is not set
+# CONFIG_TEST_STRING_HELPERS is not set
+# CONFIG_TEST_STRSCPY is not set
+# CONFIG_TEST_KSTRTOX is not set
+# CONFIG_TEST_PRINTF is not set
+# CONFIG_TEST_BITMAP is not set
+# CONFIG_TEST_BITFIELD is not set
+# CONFIG_TEST_UUID is not set
+# CONFIG_TEST_XARRAY is not set
+# CONFIG_TEST_OVERFLOW is not set
+# CONFIG_TEST_RHASHTABLE is not set
+# CONFIG_TEST_HASH is not set
+# CONFIG_TEST_IDA is not set
+# CONFIG_TEST_LKM is not set
+# CONFIG_TEST_BITOPS is not set
+# CONFIG_TEST_VMALLOC is not set
+# CONFIG_TEST_USER_COPY is not set
+# CONFIG_FIND_BIT_BENCHMARK is not set
+# CONFIG_SYSCTL_KUNIT_TEST is not set
+# CONFIG_LIST_KUNIT_TEST is not set
+# CONFIG_LINEAR_RANGES_TEST is not set
+# CONFIG_BITS_TEST is not set
+# CONFIG_TEST_UDELAY is not set
+# CONFIG_TEST_STATIC_KEYS is not set
+# CONFIG_TEST_DEBUG_VIRTUAL is not set
+# CONFIG_TEST_MEMCAT_P is not set
+# CONFIG_TEST_STACKINIT is not set
+# CONFIG_TEST_MEMINIT is not set
+# CONFIG_TEST_FPU is not set
 # CONFIG_MEMTEST is not set
 # end of Kernel Testing and Coverage
+
+#
+# Rust hacking
+#
+CONFIG_RUST_DEBUG_ASSERTIONS=y
+CONFIG_RUST_OVERFLOW_CHECKS=y
+CONFIG_RUST_CODEGEN_UNITS=1
+# end of Rust hacking
 # end of Kernel hacking