feat: add all feature for doc and test

[AsakuraMizu]

We previously used the --cfg doc hack for documentation writing and testing. While effective, it wasn't elegant. This resulted in the issue shown in #25, namely incompatibility with crates like quote.

This PR adds the all optional feature to both crates. It behaves exactly the same as when we used --cfg doc, except for some tweaks to architecture-specific dependency crates to improve compilation.

[Copilot]

Pull Request Overview

This PR replaces the --cfg doc hack with a proper all feature flag for documentation building and testing, resolving compatibility issues with crates like quote. The feature allows all architecture-specific modules to be compiled regardless of the target architecture, enabling comprehensive documentation and testing.

Key changes:

• Added all feature to both page_table_entry and page_table_multiarch crates
• Removed architecture-specific dependencies that caused cross-compilation issues (x86_64 crate, moved aarch64-cpu to dev-dependencies)
• Added conditional compilation guards for architecture-specific assembly code to prevent compilation errors when using the all feature on non-matching architectures

Reviewed Changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
page_table_multiarch/Cargo.toml	Added all feature and removed doc cfg from target dependencies
page_table_multiarch/src/arch/mod.rs	Updated module cfg attributes to use feature = "all" instead of doc
page_table_multiarch/src/arch/x86_64.rs	Added conditional compilation guards for x86_64-specific TLB flush assembly
page_table_multiarch/src/arch/riscv.rs	Added conditional compilation guards for RISC-V-specific TLB flush assembly and inlined helper function
page_table_multiarch/tests/alloc_tests.rs	Added cfg attributes to test functions to enable running with all feature
page_table_entry/Cargo.toml	Added all feature, removed x86_64 dependency, moved aarch64-cpu to dev-dependencies
page_table_entry/src/arch/mod.rs	Updated module cfg attributes to use feature = "all" instead of doc
page_table_entry/src/arch/x86_64.rs	Replaced x86_64 crate dependency by defining PTF flags inline using bitflags macro
page_table_entry/src/arch/aarch64.rs	Converted MAIR_VALUE from computed constant to hardcoded value with doctest example
page_table_entry/README.md	Removed obsolete import of PageTableFlags from x86_64 crate in example
Cargo.lock	Removed x86_64 crate and its dependencies from lock file
.github/workflows/ci.yml	Updated CI to use --all-features instead of --cfg doc and removed obsolete flags

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[AsakuraMizu]

@Azure-stars Your comments all point to the same issue. My intention was to minimize the use of target-specific dependencies because Cargo's Platform specific dependencies feature doesn't support writing things like [target.'cfg(any(target_arch = "x86_64", feature = "all")).dependencies]. I'm also unsure if there's a way to automatically enable an optional dependency on a specific platform.

[AsakuraMizu]

Well, you see it. I tried to add these platform-specific crates back, but these two x86 crates are complaining.

• x86_64 doesn't provide an instructions module on other architectures.
• x86 even doesn't compile!

In this respect, aarch64-cpu does a good job. It exposes the same interface on all architectures, but changes the internal implementation to unimplemented!() on unsupported architectures.

[Copilot]

Pull Request Overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

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