Re: [PATCH] docs: add advanced search for kernel documentation

[Rito Rhymes]

I was using the in-tree build (`make htmldocs`) before. I just ran
fresh rebuilds with both in-tree and out-of-tree (`make O=DOCS
htmldocs`) builds, and I got identical search results of 280 hits for
"futex" when serving both.

I ran the builds and served the output on Linux/x86_64, and tested the
pages in Chrome, Edge, and Firefox on Windows.

So at this point I have not been able to reproduce the "no output"
behavior with either build mode, I think we can rule out build mode
quirks.

More debugging:

As a comparison, WITHOUT using my patch, upstream only build, does the
normal Quick Search work? What results do you get for Futex?

WITH my patch, do Quick Search return any results for Futex?

How are you opening or serving the generated docs? For example, via a
local web server (`http://...`) or directly from disk (`file://...`)?
I am serving the generated output over HTTP locally via
`python -m http.server`.

What Sphinx version are you using for the build?
I built with Sphinx 9.1.0.

If possible, could you also check in the browser network tab whether
`_static/kernel-search.js`, `_static/language_data.js`, and
`searchindex.js` are all loading successfully?