diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2023-08-03 12:09:32 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2023-09-19 22:08:29 +0200 |
| commit | 1aabbc532413ced293952f8e149ad0a607d6e470 (patch) | |
| tree | 0228090cc9cef5ca2f08a36fc0f4fc2c9fd9f8fa /drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | |
| parent | a20d6f63dbfc176697886d7709312ad0a795648e (diff) | |
signal: Don't disable preemption in ptrace_stop() on PREEMPT_RT
On PREEMPT_RT keeping preemption disabled during the invocation of
cgroup_enter_frozen() is a problem because the function acquires
css_set_lock which is a sleeping lock on PREEMPT_RT and must not be
acquired with disabled preemption.
The preempt-disabled section is only for performance optimisation reasons
and can be avoided.
Extend the comment and don't disable preemption before scheduling on
PREEMPT_RT.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20230803100932.325870-3-bigeasy@linutronix.de
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c')
0 files changed, 0 insertions, 0 deletions