[PATCH 0/2] perf timechart/treport: Fix mypy errors

[PATCH 0/2] perf timechart/treport: Fix mypy errors

[James Clark]

Two small adjustments to silence Mypy static checks.

Signed-off-by: James Clark <james.clark@linaro.org>
---
James Clark (2):
      perf timechart: Fix task row type narrowing in goto_task()
      perf treport: Fix profile builder type narrowing in progress callback

 tools/perf/python/treport.py    | 5 +++--
 tools/perf/python/ttimechart.py | 5 ++---
 2 files changed, 5 insertions(+), 5 deletions(-)
---
base-commit: 1dc462fc214907671600172280c2e79ef9fe6fcf
change-id: 20261006-james-perf-timechart-mypy-e0069393c0ef

Best regards,
--  
James Clark <james.clark@linaro.org>

[PATCH 1/2] perf timechart: Fix task row type narrowing in goto_task()

[James Clark]

Mypy cannot narrow Row to TaskRow or IoRow when the class passed to
isinstance() comes from a loop variable, causing the perf build to fail
with:

  python/ttimechart.py:1686: error: "Row" has no attribute "task" [attr-defined]

Check against TaskRow and IoRow explicitly so mypy can verify access to
the task attribute. The tasks and I/O views contain TaskRow and IoRow
instances respectively, so task navigation behaves as before.

Fixes: e7a72d691980 ("perf timechart: Add an interactive --tui mode")
Assisted-by: Codex:GPT-6.1-Sol
Signed-off-by: James Clark <james.clark@linaro.org>
---
 tools/perf/python/ttimechart.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/perf/python/ttimechart.py b/tools/perf/python/ttimechart.py
index 34ecf84e68c1..d7ba0276a9fb 100755
--- a/tools/perf/python/ttimechart.py
+++ b/tools/perf/python/ttimechart.py
@@ -1676,14 +1676,13 @@ class TimechartApp(App):
 
     def goto_task(self, tid: int, time: Optional[float]) -> None:
         """Select the task in the tasks or I/O view, optionally moving the cursor."""
-        for tab_id, view_id, row_type in (("tasks", "#tasks_view", TaskRow),
-                                          ("io", "#io_view", IoRow)):
+        for tab_id, view_id in (("tasks", "#tasks_view"), ("io", "#io_view")):
             views = self.query(view_id)
             if not views:
                 continue
             view = views.first(TimelineView)
             for idx, row in enumerate(view.rows):
-                if isinstance(row, row_type) and row.task.tid == tid:
+                if isinstance(row, (TaskRow, IoRow)) and row.task.tid == tid:
                     self.query_one(TabbedContent).active = tab_id
                     if time is not None:
                         self.window = self.window.with_cursor(time)

-- 
2.43.0

[PATCH 2/2] perf treport: Fix profile builder type narrowing in progress callback

[James Clark]

Mypy does not retain the narrowing of an optional local variable inside
the nested progress callback, causing the perf build to fail with:

  python/treport.py:649: error: Item "None" of "ProfileBuilder | None" has no attribute "cancelled" [union-attr]

Check the loading builder before assigning it to profile so the captured
variable is inferred as ProfileBuilder rather than
Optional[ProfileBuilder]. Keep the existing assertion and background
loading behavior.

Fixes: b379b70b7b7b ("perf treport: Show the profile while it loads")
Assisted-by: Codex:GPT-6.1-Sol
Signed-off-by: James Clark <james.clark@linaro.org>
---
 tools/perf/python/treport.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/python/treport.py b/tools/perf/python/treport.py
index e02121475370..fb583786b17a 100755
--- a/tools/perf/python/treport.py
+++ b/tools/perf/python/treport.py
@@ -638,8 +638,9 @@ class ReportApp(App):
     @work(thread=True, exclusive=True)
     def load_profile(self) -> None:
         """Build the profile in a thread so the UI stays responsive."""
-        profile = self.loading
-        assert profile is not None
+        loading = self.loading
+        assert loading is not None
+        profile = loading
 
         def progress() -> None:
             try:

-- 
2.43.0

Re: [PATCH 2/2] perf treport: Fix profile builder type narrowing in progress callback

[sashiko-bot]

> Mypy does not retain the narrowing of an optional local variable inside
> the nested progress callback, causing the perf build to fail with:
> 
>   python/treport.py:649: error: Item "None" of "ProfileBuilder | None" has no attribute "cancelled" [union-attr]
> 
> Check the loading builder before assigning it to profile so the captured
> variable is inferred as ProfileBuilder rather than
> Optional[ProfileBuilder]. Keep the existing assertion and background
> loading behavior.
> 
> Fixes: b379b70b7b7b ("perf treport: Show the profile while it loads")
> Assisted-by: Codex:GPT-6.1-Sol
> Signed-off-by: James Clark <james.clark@linaro.org>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261006-james-perf-timechart-mypy-v1-0-e2c7edf4dd31@linaro.org?part=2

Re: [PATCH 1/2] perf timechart: Fix task row type narrowing in goto_task()

[sashiko-bot]

> Mypy cannot narrow Row to TaskRow or IoRow when the class passed to
> isinstance() comes from a loop variable, causing the perf build to fail
> with:
> 
>   python/ttimechart.py:1686: error: "Row" has no attribute "task" [attr-defined]
> 
> Check against TaskRow and IoRow explicitly so mypy can verify access to
> the task attribute. The tasks and I/O views contain TaskRow and IoRow
> instances respectively, so task navigation behaves as before.
> 
> Fixes: e7a72d691980 ("perf timechart: Add an interactive --tui mode")
> Assisted-by: Codex:GPT-6.1-Sol
> Signed-off-by: James Clark <james.clark@linaro.org>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261006-james-perf-timechart-mypy-v1-0-e2c7edf4dd31@linaro.org?part=1

Re: [PATCH 0/2] perf timechart/treport: Fix mypy errors

[Ian Rogers]

On Tue, Oct 6, 2026 at 6:03 AM James Clark <james.clark@linaro.org> wrote:
>
> Two small adjustments to silence Mypy static checks.
>
> Signed-off-by: James Clark <james.clark@linaro.org>

Reviewed-by: Ian Rogers <irogers@google.com>

Thanks!
Ian

> ---
> James Clark (2):
>       perf timechart: Fix task row type narrowing in goto_task()
>       perf treport: Fix profile builder type narrowing in progress callback
>
>  tools/perf/python/treport.py    | 5 +++--
>  tools/perf/python/ttimechart.py | 5 ++---
>  2 files changed, 5 insertions(+), 5 deletions(-)
> ---
> base-commit: 1dc462fc214907671600172280c2e79ef9fe6fcf
> change-id: 20261006-james-perf-timechart-mypy-e0069393c0ef
>
> Best regards,
> --
> James Clark <james.clark@linaro.org>
>

Re: [PATCH 0/2] perf timechart/treport: Fix mypy errors

[Arnaldo Carvalho de Melo]

On Tue, Oct 13, 2026 at 09:21:12PM -0700, Ian Rogers wrote:
> On Tue, Oct 6, 2026 at 6:03 AM James Clark <james.clark@linaro.org> wrote:
> >
> > Two small adjustments to silence Mypy static checks.
> >
> > Signed-off-by: James Clark <james.clark@linaro.org>
> 
> Reviewed-by: Ian Rogers <irogers@google.com>

Thanks, applied to perf-tools-next, for v7.4.

- Arnaldo