Re: linux-next: build warning after merge of the akpm-current tree

From: Jonathan Corbet
Date: Tue Mar 16 2021 - 19:10:00 EST

Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> writes:

[Adding Mauro]

> On Tue, 16 Mar 2021 11:18:11 -0700 Minchan Kim <minchan@xxxxxxxxxx> wrote:
>> On Mon, Mar 15, 2021 at 04:35:22PM +1100, Stephen Rothwell wrote:
>> > Hi all,
>> >
>> > After merging the akpm-current tree, today's linux-next build (htmldocs)
>> > produced this warning:
>> >
>> > Documentation/ABI/testing/sysfs-kernel-mm-cma:2: WARNING: Inline interpreted text or phrase reference start-string without end-string.
>> >
>> > Introduced by commit
>> >
>> > 439d477342a3 ("mm: cma: support sysfs")
>> >
>> Hmm, I don't get it what happened here. Was it false-positive?
> I get the above from a "make htmldocs" run ... I don't know what causes
> it, sorry. [cc'ing Jon]

OK, this took a while to figure out. The problem is this text in

> Each CMA heap subdirectory (that is, each
> /sys/kernel/mm/cma/<cma-heap-name> directory) contains the
> following items:

When scripts/ sees the /sys/kernel/mm/... string it wants to
turn it into a link to the matching ABI entry; at that point, the
<text in angle brackets> collides with the Sphinx directive and you get
that totally useless warning.

I think this is a bug in Honestly I wonder if all these
cross-links are needed at all; if they truly are, then we shouldn't be
making bogus ones. Mauro, how hard would it be to make this do the
right thing?