docs: use get_abi.py for ABI generation

Use the new script instead of the old one when generating ABI docs.

For now, execute it via exec. Future changes will better integrate it
by using the class defined there directly.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/e7fcb121c0612c94f6f54f0d742cd3a26a46cd7d.1739182025.git.mchehab+huawei@kernel.org

Documentation/admin-guide/abi-obsolete.rst

@@ -10,4 +10,3 @@ The description of the interface will document the reason why it is
 obsolete and when it can be expected to be removed.
 
 .. kernel-abi:: ABI/obsolete
-   :rst:

Documentation/admin-guide/abi-removed.rst

@@ -4,4 +4,3 @@ ABI removed symbols
 ===================
 
 .. kernel-abi:: ABI/removed
-   :rst:

Documentation/admin-guide/abi-stable.rst

@@ -13,4 +13,3 @@ Most interfaces (like syscalls) are expected to never change and always
 be available.
 
 .. kernel-abi:: ABI/stable
-   :rst:

Documentation/admin-guide/abi-testing.rst

@@ -19,4 +19,3 @@ name to the description of these interfaces, so that the kernel
 developers can easily notify them if any changes occur.
 
 .. kernel-abi:: ABI/testing
-   :rst:

Documentation/sphinx/kernel_abi.py

@@ -14,7 +14,7 @@ u"""
     :license:    GPL Version 2, June 1991 see Linux/COPYING for details.
 
     The ``kernel-abi`` (:py:class:`KernelCmd`) directive calls the
-    scripts/get_abi.pl script to parse the Kernel ABI files.
+    scripts/get_abi.py script to parse the Kernel ABI files.
 
     Overview of directive's argument and options.
 
@@ -67,7 +67,6 @@ class KernelCmd(Directive):
 
     option_spec = {
         "debug"     : directives.flag,
-        "rst"       : directives.unchanged
     }
 
     def run(self):
@@ -78,15 +77,12 @@ class KernelCmd(Directive):
         srctree = os.path.abspath(os.environ["srctree"])
 
         args = [
-            os.path.join(srctree, 'scripts/get_abi.pl'),
+            os.path.join(srctree, 'scripts/get_abi.py'),
+            '-D', os.path.join(srctree, 'Documentation', self.arguments[0]),
             'rest',
             '--enable-lineno',
-            '--dir', os.path.join(srctree, 'Documentation', self.arguments[0]),
         ]
 
-        if 'rst' in self.options:
-            args.append('--rst-source')
-
         lines = subprocess.check_output(args, cwd=os.path.dirname(doc.current_source)).decode('utf-8')
         nodeList = self.nestedParse(lines, self.arguments[0])
         return nodeList