Subject: Re: linux-next: build warning after merge of the ftrace tree

From: Jonathan Corbet <[email-masked]>
Date: Mon, 16 Nov 2020 12:24:32 -0700

On Mon, 16 Nov 2020 12:43:38 -0500
Steven Rostedt <[email-masked]> wrote:

> > After merging the ftrace tree, today's linux-next build (htmldocs)
> > produced this warning:
> > 
> > Documentation/trace/ftrace-uses.rst:123: WARNING: Unexpected indentation.
> > 
> > Introduced by commit
> > 
> >   a25d036d939a ("ftrace: Reverse what the RECURSION flag means in the ftrace_ops")
> >   
> 
> I'm not good at rst markup. Not sure how to fix this.

Looking at the commit in question:

> +Protect your callback
> +=====================
> +
> +As functions can be called from anywhere, and it is possible that a function
> +called by a callback may also be traced, and call that same callback,
> +recursion protection must be used. There are two helper functions that
> +can help in this regard. If you start your code with:
> +
> +	int bit;
> +
> +	bit = ftrace_test_recursion_trylock();
> +	if (bit < 0)
> +		return;

The problem is those literal blocks.  The easiest fix will be to just use
the double-colon notation to indicate a literal block, so the paragraph
above would end with "...start your code with::".  Note that there's a few
of them to fix.

Thanks,

jon