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Message-ID: <ca4912ca-a774-6d0e-5464-5adfd12268da@amd.com>
Date:   Tue, 6 Dec 2022 08:55:02 -0600
From:   Carlos Bilbao <carlos.bilbao@....com>
To:     Akira Yokosawa <akiyks@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        bilbao@...edu, corbet@....net, konstantin@...uxfoundation.org,
        ojeda@...nel.org
Subject: Re: [PATCH v2] docs: Integrate rustdoc into Rust documentation

On 12/6/22 08:22, Akira Yokosawa wrote:

> On Mon, 5 Dec 2022 10:36:11 -0600, Carlos Bilbao wrote:
>> On 12/4/22 19:06, Akira Yokosawa wrote:
>>
>>> Hi,
>>>
>>> On Thu, 1 Dec 2022 14:48:14 -0600, Carlos Bilbao wrote:
>>>> 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@....com>
>>>> ---
>>>>
>>>> Changes since V1:
>>>>    - Work on top of v6.1-rc1.
>>> Thank you for the rebase.
>>>
>>>>    - Don't use rustdoc.rst, instead add link to Documentation/rust/index.rst.
>>>>    - In Documentation/Makefile, replace @make rustdoc for $(Q)$(MAKE) rustdoc.
>>>>    - Don't do LLVM=1 for all rustdoc generation within `make htmldocs`.
>>>>    - Add spaces on definition of RUSTDOC_OUTPUT, for consistency.
>>>>
>>>> ---
>>>>    Documentation/Makefile       |  4 ++++
>>>>    Documentation/rust/index.rst |  3 +++
>>>>    rust/Makefile                | 15 +++++++++------
>>>>    3 files changed, 16 insertions(+), 6 deletions(-)
>>>>
>>>> diff --git a/Documentation/Makefile b/Documentation/Makefile
>>>> index 64d44c1ecad3..f537cf558af6 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
>>>> +    $(Q)$(MAKE) rustdoc
>>>> +endif
>>>>        @$(srctree)/scripts/sphinx-pre-install --version-check
>>>>        @+$(foreach var,$(SPHINXDIRS),$(call loop_cmd,sphinx,html,$(var),,$(var)))
>>> So, this means "make htmldocs" will require kernel .config if CONFIG_RUST=y.
>>> I'm not sure this new requirement is acceptable for kernel documentation
>>> testers who just want to build kernel documentation.
>>
>> This is already kind of the case for Rust-related business.
>>
>>
>>> You are doing three things in this patch.
>>>
>>>    1) Change the destination of rustdoc to under Documentation/output/
>>>    2) Add a cross reference to the generated rustdoc in
>>>       Documentation/rust/index.rst.
>>>    3) Integrate rustdoc generation into htmldocs.
>>>
>>> I'm OK with 1) and 2).
>>> Can you separate 3) into another patch and respin?
>>
>> Glad we can agree on 1) and 2). Why moving 3)? This is a small patch with
>> one overall purpose (Integrate rustdoc into website).
> Yes, I agree that 3) is a small change. I understand what you want to
> do. But there are a couple of options for _how_ to do it.
> My current position is that Documentation/Makefile is _not_ the right
> place for the change, as mentioned in my reply to Miguel.
>
>>
>>> By the way, is rustdoc's requirement of .config only for CONFIG_RUST?
>>> In other words, are contents of rustdoc affected by other config settings?
>>>
>>> If not, I think rustdoc can be generated regardless of config settings as
>>> far as necessary tools (rustc, bindgen, etc.) are available.
>>
>> Yes, but someone with the tools may not want to use them. Keep in mind that
>> generating rustdoc takes a few extra seconds.
> As mentioned in another reply, I'm convinced of the dependency on .config.
>
>>
>>>>    diff --git a/Documentation/rust/index.rst b/Documentation/rust/index.rst
>>>> index 4ae8c66b94fa..4005326c3ba9 100644
>>>> --- a/Documentation/rust/index.rst
>>>> +++ b/Documentation/rust/index.rst
>>>> @@ -6,6 +6,9 @@ Rust
>>>>    Documentation related to Rust within the kernel. To start using Rust
>>>>    in the kernel, please read the quick-start.rst guide.
>>>>    +If this documentation includes rustdoc-generated HTML, the entry point can
>>>> +be found `here. <rustdoc/kernel/index.html>`_
>>> This cross reference will only make sense in htmldocs build.
>>> Perhaps, you can use the "only::" directive [1] as follows:
>>>
>>> .. only:: html
>>
>> This I can gladly do on a V3. I will wait for an answer on issues above.
> OK.
>
> So if you split this into a two-patch series, 1/2 for 1) and 2), and 2/2
> for 3) (or an updated one), I'm glad to give my RB tag to 1/2 for Miguel
> to be able take it for v6.2 (timing is tight!). 2/2 will need at least
> a couple of respins, I guess.


Sounds good, I will divide for v3.


>
>          Thanks, Akira
>>
>>>       If this documentation includes rustdoc-generated HTML, the entry point can
>>>       be found `here. <rustdoc/kernel/index.html>`_
>>>
>>> [1]: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sphinx-doc.org%2Fen%2Fmaster%2Fusage%2Frestructuredtext%2Fdirectives.html%23directive-only&amp;data=05%7C01%7Ccarlos.bilbao%40amd.com%7Cbed091b8fae74b3d314408dad7954fc2%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C638059333550278394%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=xGbmhYsge%2BoPo%2BRrsc6fCW8htY3yh0dHk4E8gQBQV9o%3D&amp;reserved=0
>>>
>>>           Thanks, Akira
>>>
>>>> +
>>>>    .. toctree::
>>>>        :maxdepth: 1
>>>>    diff --git a/rust/Makefile b/rust/Makefile
>>>> index 7700d3853404..080c07048065 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
>>>>    @@ -58,7 +61,7 @@ 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 $<
>>>>    @@ -75,15 +78,15 @@ 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 \
>>>> @@ -141,7 +144,7 @@ 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 $(subst rusttest-,,$@) $<
>>>>      # We cannot use `-Zpanic-abort-tests` because some tests are dynamic,
>>>>
>>>> base-commit: 9abf2313adc1ca1b6180c508c25f22f9395cc780
>>
>> Thanks,
>> Carlos



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