[PATCH 0/2] perf python: Fix pylint warnings without Textual

[PATCH 0/2] perf python: Fix pylint warnings without Textual

[Leo Yan]

An arm64 cross build without Textual on the host reports W0201 warnings
in treport.py and ttimechart.py, causing the build to fail.

Initialize the inherited attributes in their constructors so pylint can
recognize them without resolving the Textual base classes.

Signed-off-by: Leo Yan <leo.yan@arm.com>
---
Leo Yan (2):
      perf treport: Initialize the subtitle in the constructor
      perf timechart: Initialize Textual attributes in constructors

 tools/perf/python/treport.py    | 2 +-
 tools/perf/python/ttimechart.py | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)
---
base-commit: 1c90f0a3c8a1c4e38f9edd97af9e20848805a7fb
change-id: 20261023-perf_fix_pylint_warning-58408f0b6c91

Best regards,
-- 
Leo Yan <leo.yan@arm.com>

[PATCH 1/2] perf treport: Initialize the subtitle in the constructor

[Leo Yan]

For Arm64 cross build without Textual, assignments outside __init__()
trigger pylint warning:

  ************* Module treport
  python/treport.py:625:8: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)
  python/treport.py:629:12: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)
  python/treport.py:668:8: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)
  python/treport.py:675:8: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)

  ------------------------------------------------------------------
  Your code has been rated at 9.91/10 (previous run: 9.91/10, +0.00)

Move the initial subtitle assignment from on_mount() to
ReportApp.__init__() so pylint can see the attribute initialization
without resolving the Textual base class.

Fixes: b379b70b7b7b ("perf treport: Show the profile while it loads")
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
 tools/perf/python/treport.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/python/treport.py b/tools/perf/python/treport.py
index e021214753707780343e79dfc6964b9c69698197..f8c95ac1c6e067e8291eed59530f31c77886df68 100755
--- a/tools/perf/python/treport.py
+++ b/tools/perf/python/treport.py
@@ -602,6 +602,7 @@ class ReportApp(App):
         """
         super().__init__()
         self.input_file = input_file
+        self.sub_title = input_file
         self.root = root if root else ProfileNode("root", parent=None)
         self.loaded = root is not None
         # Held when reading or changing the profile, which is built in a
@@ -622,7 +623,6 @@ class ReportApp(App):
 
     def on_mount(self) -> None:
         """Start loading the profile unless it was given."""
-        self.sub_title = self.input_file
         if self.loaded:
             self.update_views()
         else:

-- 
2.34.1

[PATCH 2/2] perf timechart: Initialize Textual attributes in constructors

[Leo Yan]

When Textual is unavailable, pylint cannot resolve the inherited
virtual_size and sub_title attributes, which triggers pylint warnings
and caused arm64 cross build failure:

  ************* Module ttimechart
  python/ttimechart.py:1086:8: W0201: Attribute 'virtual_size' defined outside __init__ (attribute-defined-outside-init)
  python/ttimechart.py:1422:12: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)
  python/ttimechart.py:1496:8: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)
  python/ttimechart.py:1510:8: W0201: Attribute 'sub_title' defined outside __init__ (attribute-defined-outside-init)

Initialize both attributes in their respective constructors. Use
Textual's default empty virtual size, with the actual geometry
computed when the timeline mounts or resizes.

Fixes: e7a72d691980 ("perf timechart: Add an interactive --tui mode")
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
 tools/perf/python/ttimechart.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/python/ttimechart.py b/tools/perf/python/ttimechart.py
index 34ecf84e68c1db7f542070dde608ac09d662a1b2..16d2bbbdd98b23d64ab42643db42686cad98f0f0 100755
--- a/tools/perf/python/ttimechart.py
+++ b/tools/perf/python/ttimechart.py
@@ -1065,6 +1065,7 @@ class TimelineView(ScrollView):
         self.can_focus = True
         self.data = data
         self.rows = rows
+        self.virtual_size = Size(0, 0)
         self.cache: Dict[int, List[Cell]] = {}
         self.cache_key: Tuple[float, float, int, Optional[ThemeColors]] = (0.0, 0.0, 0, None)
         self.label_style = Style()
@@ -1332,6 +1333,7 @@ class TimechartApp(App):
         """
         super().__init__()
         self.input_name = input_name
+        self.sub_title = input_name
         self.power_only = power_only
         self.tasks_only = tasks_only
         self.filters = filters

-- 
2.34.1

Re: [PATCH 0/2] perf python: Fix pylint warnings without Textual

[Arnaldo Carvalho de Melo]

On Fri, Oct 23, 2026 at 02:20:23PM +0100, Leo Yan wrote:
> An arm64 cross build without Textual on the host reports W0201 warnings
> in treport.py and ttimechart.py, causing the build to fail.
> 
> Initialize the inherited attributes in their constructors so pylint can
> recognize them without resolving the Textual base classes.

Seems simple enough, applying for v7.4.

- Arnaldo
 
> Signed-off-by: Leo Yan <leo.yan@arm.com>
> ---
> Leo Yan (2):
>       perf treport: Initialize the subtitle in the constructor
>       perf timechart: Initialize Textual attributes in constructors
> 
>  tools/perf/python/treport.py    | 2 +-
>  tools/perf/python/ttimechart.py | 2 ++
>  2 files changed, 3 insertions(+), 1 deletion(-)
> ---
> base-commit: 1c90f0a3c8a1c4e38f9edd97af9e20848805a7fb
> change-id: 20261023-perf_fix_pylint_warning-58408f0b6c91
> 
> Best regards,
> -- 
> Leo Yan <leo.yan@arm.com>
>