[RFC PATCH v1 5/9] freezer: set default freeze priority for PF_SUSPEND_TASK processes

Tasks marked with PF_SUSPEND_TASK are involved in system suspend or
hibernate operations. These tasks must not be frozen, as they are
responsible for coordinating or executing parts of the suspend/resume
sequence.

This patch explicitly sets their freeze_priority to FREEZE_PRIORITY_NEVER
during initialization. This makes their exemption from the freezer logic
clear in the new freeze-priority model and avoids redundant evaluations
during process traversal.

Signed-off-by: Zihuan Zhang <redacted>
---
 kernel/power/process.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/power/process.c b/kernel/power/process.c
index 06eafdb32abb..21bbca7040cf 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c

@@ -147,6 +147,7 @@ int freeze_processes(void)
 
 	pm_wakeup_clear(0);
 	pm_freezing = true;
+	freeze_set_default_priority(current, FREEZE_PRIORITY_NEVER);
 	error = try_to_freeze_tasks(true);
 	if (!error)
 		__usermodehelper_set_disable_depth(UMH_DISABLED);

@@ -218,6 +219,7 @@ void thaw_processes(void)
 	WARN_ON(!(curr->flags & PF_SUSPEND_TASK));
 	curr->flags &= ~PF_SUSPEND_TASK;
 
+	freeze_set_default_priority(current, FREEZE_PRIORITY_NORMAL);
 	usermodehelper_enable();
 
 	schedule();

-- 
2.25.1