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Message-ID: <20240704170738.3621-21-dakr@redhat.com>
Date: Thu, 4 Jul 2024 19:06:48 +0200
From: Danilo Krummrich <dakr@...hat.com>
To: ojeda@...nel.org,
alex.gaynor@...il.com,
wedsonaf@...il.com,
boqun.feng@...il.com,
gary@...yguo.net,
bjorn3_gh@...tonmail.com,
benno.lossin@...ton.me,
a.hindborg@...sung.com,
aliceryhl@...gle.com
Cc: daniel.almeida@...labora.com,
faith.ekstrand@...labora.com,
boris.brezillon@...labora.com,
lina@...hilina.net,
mcanal@...lia.com,
zhiw@...dia.com,
acurrid@...dia.com,
cjia@...dia.com,
jhubbard@...dia.com,
airlied@...hat.com,
ajanulgu@...hat.com,
lyude@...hat.com,
linux-kernel@...r.kernel.org,
rust-for-linux@...r.kernel.org,
Danilo Krummrich <dakr@...hat.com>
Subject: [PATCH 20/20] kbuild: rust: remove the `alloc` crate
Now that we have our own `Allocator`, `KBox` and `KVec` we can remove
Rust's `alloc` crate and the corresponding unstable features.
Signed-off-by: Danilo Krummrich <dakr@...hat.com>
---
rust/Makefile | 44 ++++++++++--------------------------------
rust/exports.c | 1 -
scripts/Makefile.build | 7 +------
3 files changed, 11 insertions(+), 41 deletions(-)
diff --git a/rust/Makefile b/rust/Makefile
index f70d5e244fee..409be08ad09a 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -15,9 +15,8 @@ always-$(CONFIG_RUST) += libmacros.so
no-clean-files += libmacros.so
always-$(CONFIG_RUST) += bindings/bindings_generated.rs bindings/bindings_helpers_generated.rs
-obj-$(CONFIG_RUST) += alloc.o bindings.o kernel.o
-always-$(CONFIG_RUST) += exports_alloc_generated.h exports_bindings_generated.h \
- exports_kernel_generated.h
+obj-$(CONFIG_RUST) += bindings.o kernel.o
+always-$(CONFIG_RUST) += exports_bindings_generated.h exports_kernel_generated.h
always-$(CONFIG_RUST) += uapi/uapi_generated.rs
obj-$(CONFIG_RUST) += uapi.o
@@ -60,11 +59,6 @@ endif
core-cfgs = \
--cfg no_fp_fmt_parse
-alloc-cfgs = \
- --cfg no_global_oom_handling \
- --cfg no_rc \
- --cfg no_sync
-
quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
cmd_rustdoc = \
OBJTREE=$(abspath $(objtree)) \
@@ -87,7 +81,7 @@ quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
# command-like flags to solve the issue. Meanwhile, we use the non-custom case
# and then retouch the generated files.
rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
- rustdoc-alloc rustdoc-kernel
+ rustdoc-kernel
$(Q)cp $(srctree)/Documentation/images/logo.svg $(rustdoc_output)/static.files/
$(Q)cp $(srctree)/Documentation/images/COPYING-logo $(rustdoc_output)/static.files/
$(Q)find $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \
@@ -111,20 +105,11 @@ rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
+$(call if_changed,rustdoc)
-# We need to allow `rustdoc::broken_intra_doc_links` because some
-# `no_global_oom_handling` functions refer to non-`no_global_oom_handling`
-# functions. Ideally `rustdoc` would have a way to distinguish broken links
-# due to things that are "configured out" vs. entirely non-existing ones.
-rustdoc-alloc: private rustc_target_flags = $(alloc-cfgs) \
- -Arustdoc::broken_intra_doc_links
-rustdoc-alloc: $(RUST_LIB_SRC)/alloc/src/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE
- +$(call if_changed,rustdoc)
-
-rustdoc-kernel: private rustc_target_flags = --extern alloc \
+rustdoc-kernel: private rustc_target_flags = \
--extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
--extern bindings --extern uapi
rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \
- rustdoc-compiler_builtins rustdoc-alloc $(obj)/libmacros.so \
+ rustdoc-compiler_builtins $(obj)/libmacros.so \
$(obj)/bindings.o FORCE
+$(call if_changed,rustdoc)
@@ -169,7 +154,7 @@ quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
OBJTREE=$(abspath $(objtree)) \
$(RUSTDOC) --test $(rust_flags) \
- -L$(objtree)/$(obj) --extern alloc --extern kernel \
+ -L$(objtree)/$(obj) --extern kernel \
--extern build_error --extern macros \
--extern bindings --extern uapi \
--no-run --crate-name kernel -Zunstable-options \
@@ -251,7 +236,7 @@ rusttest-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
+$(call if_changed,rustc_test)
+$(call if_changed,rustdoc_test)
-rusttest-kernel: private rustc_target_flags = --extern alloc \
+rusttest-kernel: private rustc_target_flags = \
--extern build_error --extern macros --extern bindings --extern uapi
rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \
@@ -364,9 +349,6 @@ quiet_cmd_exports = EXPORTS $@
$(obj)/exports_core_generated.h: $(obj)/core.o FORCE
$(call if_changed,exports)
-$(obj)/exports_alloc_generated.h: $(obj)/alloc.o FORCE
- $(call if_changed,exports)
-
$(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
$(call if_changed,exports)
@@ -402,7 +384,7 @@ quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L
rust-analyzer:
$(Q)$(srctree)/scripts/generate_rust_analyzer.py \
- --cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \
+ --cfgs='core=$(core-cfgs)' \
$(realpath $(srctree)) $(realpath $(objtree)) \
$(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json
@@ -434,12 +416,6 @@ $(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
$(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 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)
-
$(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
+$(call if_changed_dep,rustc_library)
@@ -454,9 +430,9 @@ $(obj)/uapi.o: $(src)/uapi/lib.rs \
$(obj)/uapi/uapi_generated.rs FORCE
+$(call if_changed_dep,rustc_library)
-$(obj)/kernel.o: private rustc_target_flags = --extern alloc \
+$(obj)/kernel.o: private rustc_target_flags = \
--extern build_error --extern macros --extern bindings --extern uapi
-$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
+$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/build_error.o \
$(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
+$(call if_changed_dep,rustc_library)
diff --git a/rust/exports.c b/rust/exports.c
index 3803c21d1403..1b870e8e83ea 100644
--- a/rust/exports.c
+++ b/rust/exports.c
@@ -16,7 +16,6 @@
#define EXPORT_SYMBOL_RUST_GPL(sym) extern int sym; EXPORT_SYMBOL_GPL(sym)
#include "exports_core_generated.h"
-#include "exports_alloc_generated.h"
#include "exports_bindings_generated.h"
#include "exports_kernel_generated.h"
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index efacca63c897..7e7b6b3d5bb9 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -262,18 +262,13 @@ $(obj)/%.lst: $(obj)/%.c FORCE
# Compile Rust sources (.rs)
# ---------------------------------------------------------------------------
-
-rust_allowed_features := new_uninit
-
# `--out-dir` is required to avoid temporaries being created by `rustc` in the
# current working directory, which may be not accessible in the out-of-tree
# modules case.
rust_common_cmd = \
RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \
- -Zallow-features=$(rust_allowed_features) \
-Zcrate-attr=no_std \
- -Zcrate-attr='feature($(rust_allowed_features))' \
- -Zunstable-options --extern force:alloc --extern kernel \
+ -Zunstable-options --extern kernel \
--crate-type rlib -L $(objtree)/rust/ \
--crate-name $(basename $(notdir $@)) \
--sysroot=/dev/null \
--
2.45.2
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