linux-kernel - Re: [PATCH 04/13] rust: relax most deny-level lints to warnings

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Message-ID: <WGFMwMlEU5xZ0Gz_9eqp_ATSk4UiloYSjxQi3JpxZsPQK_HU5S0RYxvLO9KXJEkADsKWKmtDfRYdpAkLrUpprgS2tbo-vIKfAW6Inc-Lhxc=@protonmail.com>
Date: Mon, 01 Jul 2024 19:48:46 +0000
From: Björn Roy Baron <bjorn3_gh@...tonmail.com>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: Wedson Almeida Filho <wedsonaf@...il.com>, Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl <aliceryhl@...gle.com>, rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, patches@...ts.linux.dev, Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 04/13] rust: relax most deny-level lints to warnings

On Monday, July 1st, 2024 at 20:36, Miguel Ojeda <ojeda@...nel.org> wrote:

> Since we are starting to support several Rust toolchains, lints (including
> Clippy ones) now may behave differently and lint groups may include
> new lints.
> 
> Therefore, to maximize the chances a given version works, relax some
> deny-level lints to warnings. It may also make our lives a bit easier
> while developing new code or refactoring.
> 
> To be clear, the requirements for in-tree code are still the same, since
> Rust code still needs to be warning-free (patches should be clean under
> `WERROR=y`) and the set of lints is not changed.
> 
> `unsafe_op_in_unsafe_fn` is left unmodified, i.e. as an error, since
> 1) it is simple enough that it should not have false positives (unlike
> e.g. `rust_2018_idioms`'s `explicit_outlives_requirements`) and 2) it is
> becoming the default in the language (warn-by-default in Rust 2024 [1] and
> ideally an error later on) and thus it should also be very well tested.
> 
> Link: https://github.com/rust-lang/rust/pull/112038 [1]
> Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
> ---
>  Makefile      | 22 +++++++++++-----------
>  rust/Makefile |  4 ++--
>  2 files changed, 13 insertions(+), 13 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 4d36f943b3b1..056176a55d63 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -461,17 +461,17 @@ KBUILD_USERLDFLAGS := $(USERLDFLAGS)
>  # host programs.
>  export rust_common_flags := --edition=2021 \
>  			    -Zbinary_dep_depinfo=y \
> -			    -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \
> -			    -Dunreachable_pub -Dnon_ascii_idents \
> +			    -Dunsafe_op_in_unsafe_fn -Wrust_2018_idioms \
> +			    -Wunreachable_pub -Wnon_ascii_idents \

Maybe also keep non_ascii_idents as error? It shouldn't have any false positives.

>  			    -Wmissing_docs \
> -			    -Drustdoc::missing_crate_level_docs \
> -			    -Dclippy::correctness -Dclippy::style \
> -			    -Dclippy::suspicious -Dclippy::complexity \
> -			    -Dclippy::perf \
> -			    -Dclippy::let_unit_value -Dclippy::mut_mut \
> -			    -Dclippy::needless_bitwise_bool \
> -			    -Dclippy::needless_continue \
> -			    -Dclippy::no_mangle_with_rust_abi \
> +			    -Wrustdoc::missing_crate_level_docs \
> +			    -Wclippy::correctness -Wclippy::style \
> +			    -Wclippy::suspicious -Wclippy::complexity \
> +			    -Wclippy::perf \
> +			    -Wclippy::let_unit_value -Wclippy::mut_mut \
> +			    -Wclippy::needless_bitwise_bool \
> +			    -Wclippy::needless_continue \
> +			    -Wclippy::no_mangle_with_rust_abi \
>  			    -Wclippy::dbg_macro
> 
>  KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
> @@ -573,7 +573,7 @@ KBUILD_RUSTFLAGS := $(rust_common_flags) \
>  		    -Csymbol-mangling-version=v0 \
>  		    -Crelocation-model=static \
>  		    -Zfunction-sections=n \
> -		    -Dclippy::float_arithmetic
> +		    -Wclippy::float_arithmetic
> 
>  KBUILD_AFLAGS_KERNEL :=
>  KBUILD_CFLAGS_KERNEL :=
> diff --git a/rust/Makefile b/rust/Makefile
> index f70d5e244fee..4c03e53d3084 100644
> --- a/rust/Makefile
> +++ b/rust/Makefile
> @@ -421,7 +421,7 @@ ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
>  endif
> 
>  $(obj)/core.o: private skip_clippy = 1
> -$(obj)/core.o: private skip_flags = -Dunreachable_pub
> +$(obj)/core.o: private skip_flags = -Wunreachable_pub
>  $(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
>  $(obj)/core.o: private rustc_target_flags = $(core-cfgs)
>  $(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
> @@ -435,7 +435,7 @@ $(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
>  	+$(call if_changed_dep,rustc_library)
> 
>  $(obj)/alloc.o: private skip_clippy = 1
> -$(obj)/alloc.o: private skip_flags = -Dunreachable_pub
> +$(obj)/alloc.o: private skip_flags = -Wunreachable_pub
>  $(obj)/alloc.o: private rustc_target_flags = $(alloc-cfgs)
>  $(obj)/alloc.o: $(RUST_LIB_SRC)/alloc/src/lib.rs $(obj)/compiler_builtins.o FORCE
>  	+$(call if_changed_dep,rustc_library)
> --
> 2.45.2

Cheers,
Bjorn