[PATCH] docs: Integrate rustdoc into Rust documentation

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Include HTML output generated with rustdoc into the Linux kernel
documentation on Rust. Change target `make htmldocs` to combine RST Sphinx
and the generation of Rust documentation, when support is available.

Signed-off-by: Carlos Bilbao <carlos.bilbao@xxxxxxx>
---
 Documentation/Makefile         |  4 ++++
 Documentation/rust/index.rst   |  1 +
 Documentation/rust/rustdoc.rst |  7 +++++++
 rust/Makefile                  | 15 +++++++++------
 4 files changed, 21 insertions(+), 6 deletions(-)
 create mode 100644 Documentation/rust/rustdoc.rst

diff --git a/Documentation/Makefile b/Documentation/Makefile
index 64d44c1ecad3..5e9435198cfb 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -92,6 +92,10 @@ quiet_cmd_sphinx = SPHINX  $@ --> file://$(abspath $(BUILDDIR)/$3/$4)
 	fi
 
 htmldocs:
+# If Rust support is available, add rustdoc generated contents
+ifdef CONFIG_RUST
+	@make LLVM=1 rustdoc
+endif
 	@$(srctree)/scripts/sphinx-pre-install --version-check
 	@+$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,html,$(var),,$(var)))
 
diff --git a/Documentation/rust/index.rst b/Documentation/rust/index.rst
index 4ae8c66b94fa..5e7a9d39af90 100644
--- a/Documentation/rust/index.rst
+++ b/Documentation/rust/index.rst
@@ -13,6 +13,7 @@ in the kernel, please read the quick-start.rst guide.
     general-information
     coding-guidelines
     arch-support
+    rustdoc
 
 .. only::  subproject and html
 
diff --git a/Documentation/rust/rustdoc.rst b/Documentation/rust/rustdoc.rst
new file mode 100644
index 000000000000..aa63a550b34c
--- /dev/null
+++ b/Documentation/rust/rustdoc.rst
@@ -0,0 +1,7 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Rustdoc output
+==============
+
+If this documentation includes rustdoc-generated HTML, the entry point
+can be found `here. <rustdoc/kernel/index.html>`_
diff --git a/rust/Makefile b/rust/Makefile
index f32df0e49815..eb2ff9260a6c 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -1,5 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 
+# Where to place rustdoc generated documentation
+RUSTDOC_OUTPUT=$(objtree)/Documentation/output/rust/rustdoc
+
 always-$(CONFIG_RUST) += target.json
 no-clean-files += target.json
 
@@ -67,7 +70,7 @@ quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
 	OBJTREE=$(abspath $(objtree)) \
 	$(RUSTDOC) $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags)) \
 		$(rustc_target_flags) -L$(objtree)/$(obj) \
-		--output $(objtree)/$(obj)/doc \
+		--output $(RUSTDOC_OUTPUT) \
 		--crate-name $(subst rustdoc-,,$@) \
 		@$(objtree)/include/generated/rustc_cfg $<
 
@@ -84,15 +87,15 @@ quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
 # and then retouch the generated files.
 rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
     rustdoc-alloc rustdoc-kernel
-	$(Q)cp $(srctree)/Documentation/images/logo.svg $(objtree)/$(obj)/doc
-	$(Q)cp $(srctree)/Documentation/images/COPYING-logo $(objtree)/$(obj)/doc
-	$(Q)find $(objtree)/$(obj)/doc -name '*.html' -type f -print0 | xargs -0 sed -Ei \
+	$(Q)cp $(srctree)/Documentation/images/logo.svg $(RUSTDOC_OUTPUT)
+	$(Q)cp $(srctree)/Documentation/images/COPYING-logo $(RUSTDOC_OUTPUT)
+	$(Q)find $(RUSTDOC_OUTPUT) -name '*.html' -type f -print0 | xargs -0 sed -Ei \
 		-e 's:rust-logo\.svg:logo.svg:g' \
 		-e 's:rust-logo\.png:logo.svg:g' \
 		-e 's:favicon\.svg:logo.svg:g' \
 		-e 's:<link rel="alternate icon" type="image/png" href="[./]*favicon-(16x16|32x32)\.png">::g'
 	$(Q)echo '.logo-container > img { object-fit: contain; }' \
-		>> $(objtree)/$(obj)/doc/rustdoc.css
+		>> $(RUSTDOC_OUTPUT)/rustdoc.css
 
 rustdoc-macros: private rustdoc_host = yes
 rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
@@ -153,7 +156,7 @@ quiet_cmd_rustdoc_test = RUSTDOC T $<
 		@$(objtree)/include/generated/rustc_cfg \
 		$(rustc_target_flags) $(rustdoc_test_target_flags) \
 		--sysroot $(objtree)/$(obj)/test/sysroot $(rustdoc_test_quiet) \
-		-L$(objtree)/$(obj)/test --output $(objtree)/$(obj)/doc \
+		-L$(objtree)/$(obj)/test --output $(RUSTDOC_OUTPUT) \
 		--crate-name $(subst rusttest-,,$@) $<
 
 quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
-- 
2.34.1




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