On Fri, 25 Oct 2019, Changbin Du [off-list ref] wrote:

On Fri, Oct 25, 2019 at 09:57:48AM +0300, Jani Nikula wrote:

quoted

On Thu, 24 Oct 2019, Jonathan Corbet [off-list ref] wrote:

quoted

On Sun, 20 Oct 2019 21:17:17 +0800
Changbin Du [off-list ref] wrote:

quoted

The 'functions' directive is not only for functions, but also works for
structs/unions. So the name is misleading. This patch renames it to
'identifiers', which specific the functions/types to be included in
documentation. We keep the old name as an alias of the new one before
all documentation are updated.

Signed-off-by: Changbin Du <redacted>

So I think this is basically OK, but I have one more request...

[...]

quoted

diff --git a/Documentation/sphinx/kerneldoc.py b/Documentation/sphinx/kerneldoc.py
index 1159405cb920..0689f9c37f1e 100644
--- a/Documentation/sphinx/kerneldoc.py
+++ b/Documentation/sphinx/kerneldoc.py

@@ -59,9 +59,10 @@ class KernelDocDirective(Directive):
     optional_arguments = 4
     option_spec = {
         'doc': directives.unchanged_required,
-        'functions': directives.unchanged,
         'export': directives.unchanged,
         'internal': directives.unchanged,
+        'identifiers': directives.unchanged,
+        'functions': directives.unchanged,  # alias of 'identifiers'
     }
     has_content = False
 

@@ -71,6 +72,7 @@ class KernelDocDirective(Directive):
 
         filename = env.config.kerneldoc_srctree + '/' + self.arguments[0]
         export_file_patterns = []
+        identifiers = None
 
         # Tell sphinx of the dependency
         env.note_dependency(os.path.abspath(filename))

@@ -86,19 +88,22 @@ class KernelDocDirective(Directive):
             export_file_patterns = str(self.options.get('internal')).split()
         elif 'doc' in self.options:
             cmd += ['-function', str(self.options.get('doc'))]
+        elif 'identifiers' in self.options:
+            identifiers = self.options.get('identifiers').split()
         elif 'functions' in self.options:
-            functions = self.options.get('functions').split()
-            if functions:
-                for f in functions:
-                    cmd += ['-function', f]
-            else:
-                cmd += ['-no-doc-sections']
+            identifiers = self.options.get('functions').split()

Rather than do this, can you just change the elif line to read:

    elif ('identifiers' in self.options) or ('functions' in self.options):

...then leave the rest of the code intact?  It keeps the logic together,
and avoids the confusing distinction between identifiers=='' and
identifiers==None .

I think the problem is you still need to distinguish between the two for
the get('functions') part.

One option is to rename 'functions' to 'identifiers' in the above block,
and put something like this above the whole if ladder (untested):

        # backward compat
        if 'functions' in self.options:
            if 'identifiers' in self.options:
                kernellog.warn(env.app, "fail")

This will miss the content of 'functions' directive if both exist in
same doc.

Did you not notice your patch does the same, except silently, while this
would produce a warning? Which one is less surprising?

quoted

            else:
                self.options.set('identifiers', self.options.get('functions'))

BR,
Jani.

After comparing, I still perfer my original code which is simpler. :)

But is it, really? I agree with Jon about the distinction between None
and '' being confusing.


BR,
Jani.

quoted

-- 
Jani Nikula, Intel Open Source Graphics Center

-- 
Jani Nikula, Intel Open Source Graphics Center