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Message-ID: <20231006155739.246381-2-yakoyoku@gmail.com>
Date: Fri, 6 Oct 2023 12:57:37 -0300
From: Martin Rodriguez Reboredo <yakoyoku@...il.com>
To: Masahiro Yamada <masahiroy@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Nicolas Schier <nicolas@...sle.eu>,
Miguel Ojeda <ojeda@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Wedson Almeida Filho <wedsonaf@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <benno.lossin@...ton.me>,
Andreas Hindborg <a.hindborg@...sung.com>,
Alice Ryhl <aliceryhl@...gle.com>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
rust-for-linux@...r.kernel.org
Subject: [RFC PATCH 1/1] scripts: Build per module Rust crates
Enables compiling Rust crates as dependencies of kernel modules.
When a composite object depends on an `.rlib` file, which by the way is
a current ar archive, Kbuild will compile it from its base Rust source
and link it.
This makes possible to have Rust bindings for a subsystem that is
compiled as a module.
Signed-off-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
---
Makefile | 4 ++--
scripts/Makefile.build | 10 +++++++++-
scripts/Makefile.lib | 19 +++++++++++++------
3 files changed, 24 insertions(+), 9 deletions(-)
diff --git a/Makefile b/Makefile
index 7d6be12e4c3e..7774c97e8aa0 100644
--- a/Makefile
+++ b/Makefile
@@ -283,7 +283,7 @@ no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
headers_install modules_install modules_sign kernelrelease image_name
no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
image_name
-single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
+single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rlib %.rsi %.s %.symtypes %/
config-build :=
mixed-build :=
@@ -1919,7 +1919,7 @@ $(clean-dirs):
clean: $(clean-dirs)
$(call cmd,rmfiles)
@find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
- \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
+ \( -name '*.[aios]' -o -name '*.rlib' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
-o -name '*.ko.*' \
-o -name '*.dtb' -o -name '*.dtbo' \
-o -name '*.dtb.S' -o -name '*.dtbo.S' \
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index da37bfa97211..627010518b27 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -246,7 +246,9 @@ $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
# To make this rule robust against "Argument list too long" error,
# ensure to add $(obj)/ prefix by a shell command.
cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \
- $(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@
+ $(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@ && \
+ printf '%s\n' $(call real-search, $*.rlib, .rlib, -objs -y -m) | \
+ $(AWK) '!x[$$0]++ { print("--library=$(obj)/"$$0) }' >> $@
$(obj)/%.mod: FORCE
$(call if_changed,mod)
@@ -291,6 +293,12 @@ quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
$(obj)/%.o: $(src)/%.rs FORCE
$(call if_changed_dep,rustc_o_rs)
+quiet_cmd_rustc_rlib_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
+ cmd_rustc_rlib_rs = $(rust_common_cmd) -Ccodegen-units=1 --emit=link=$@ $<
+
+$(obj)/%.rlib: $(src)/%.rs FORCE
+ $(call if_changed_dep,rustc_rlib_rs)
+
quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
cmd_rustc_rsi_rs = \
$(rust_common_cmd) -Zunpretty=expanded $< >$@; \
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 68d0134bdbf9..6e8cfbad015d 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -53,14 +53,18 @@ multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -),
real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))
# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
-multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
-multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
+multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y) \
+ $(call multi-search, $(obj-y), .rlib, -objs -y)
+multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m) \
+ $(call multi-search, $(obj-m), .rlib, -objs -y -m)
multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
# Replace multi-part objects by their individual parts,
# including built-in.a from subdirectories
-real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
-real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
+real-obj-y := $(call real-search, $(obj-y), .o, -objs -y) \
+ $(call real-search, $(obj-y), .rlib, -objs -y)
+real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m) \
+ $(call real-search, $(obj-m), .rlib, -objs -y -m)
always-y += $(always-m)
@@ -107,7 +111,8 @@ endif
# Finds the multi-part object the current object will be linked into.
# If the object belongs to two or more multi-part objects, list them all.
modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
- $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
+ $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=)) \
+ $(if $(filter $*.rlib, $(call suffix-search, $m, .rlib, -objs -y -m)),$(m:.rlib=))))
__modname = $(or $(modname-multi),$(basetarget))
@@ -210,7 +215,9 @@ _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
endif
endif
-part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
+part-of-module = \
+ $(if $(or $(filter $(basename $@).o, $(real-obj-m)), \
+ $(filter $(basename $@).rlib, $(real-obj-m))),y)
quiet_modtag = $(if $(part-of-module),[M], )
modkern_cflags = \
--
2.42.0
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