Disable preempt count checking by default

Author: nbdd0121

Cargo.toml

@@ -8,10 +8,6 @@ version = "0.1.0"
 edition = "2024"
 license = "MIT OR Apache-2.0"
 
-[features]
-preempt_count = []
-default = ["preempt_count"]
-
 [dependencies]
 rusqlite = "0.37"
 home = "0.5"

README.md

@@ -31,20 +31,22 @@ nix run github:Rust-for-Linux/klint
 
 ## Run on Linux kernel
 
-`klint`'s atomic context checker is not lint-clean on Linux kernel tree.
-If you would just like to use the `build_error` and stack frame size check feature, you can choose to disable atomic context checking when building `klint`:
 ```console
-cargo install --path . --no-default-features
+cargo install --path .
 ```
 
 `klint` is a tool and would need to be registered with `rustc`, to do so, apply [this patch](doc/kernel.patch) to the kernel tree.
 This patch can be used even if plain rustc or clippy is used for kernel build.
 
 To run this tool for Linux kernel build, use `make RUSTC=<path to klint>` to use klint in place of a Rust compiler.
 
+`klint`'s atomic context checker is not lint-clean on Linux kernel tree.
+If you want to check it out, you can opt into it with `-Dklint::atomic_context`.
+
 ## Implemented Lints
 
 * [Infallible allocation](doc/infallible_allocation.md)
 * [Atomic context](doc/atomic_context.md)
 * [`build_error` checks](doc/build_error.md)
 * [Stack frame size check](doc/stack_size.md)
+* [Prelude check](doc/not_using_prelude.md)

src/atomic_context.rs

@@ -62,7 +62,7 @@ use crate::preempt_count::*;
 
 declare_tool_lint! {
     pub klint::ATOMIC_CONTEXT,
-    Deny,
+    Allow,
     ""
 }
 

src/main.rs

@@ -131,7 +131,6 @@ impl Callbacks for MyCallbacks {
 
             // lint_store
             //     .register_late_pass(|_| Box::new(infallible_allocation::InfallibleAllocation));
-            #[cfg(feature = "preempt_count")]
             lint_store.register_late_pass(|tcx| {
                 Box::new(atomic_context::AtomicContext {
                     cx: driver::cx::<MyCallbacks>(tcx),

tests/compile-test.rs

@@ -29,6 +29,7 @@ fn run_ui_tests(bless: bool) {
             "-Zcrate-attr=register_tool(klint)",
             "--crate-type=lib",
             "-Zcrate-attr=no_std",
+            "-Dklint::atomic_context",
             "--extern alloc",
             "--emit=obj",
             "-O",