[PATCH] docs: kernel_abi.py: add sphinx build dependencies

[Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>]

Ensure that Sphinx-build will handle the files parsed by
get_abi.pl as dependencies. This way, if they are touched,
the ABI output will be regenerated.

Reported-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
---
 Documentation/sphinx/kernel_abi.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/sphinx/kernel_abi.py b/Documentation/sphinx/kernel_abi.py
index 4392b3cb4020..efab9b14a9f5 100644
--- a/Documentation/sphinx/kernel_abi.py
+++ b/Documentation/sphinx/kernel_abi.py
@@ -128,6 +128,7 @@ class KernelCmd(Directive):
         return out
 
     def nestedParse(self, lines, fname):
+        env = self.state.document.settings.env
         content = ViewList()
         node = nodes.section()
 
@@ -154,6 +155,9 @@ class KernelCmd(Directive):
                     self.do_parse(content, node)
                     content = ViewList()
 
+                    # Add the file to Sphinx build dependencies
+                    env.note_dependency(os.path.abspath(f))
+
                 f = new_f
 
                 # sphinx counts lines from 0
-- 
2.35.1