linux-kernel - pt_regs usage in cpuacct

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Date:   Thu, 9 Nov 2017 11:41:26 +0300
From:   "Pavel V. Panteleev" <panteleev_p@...t.ru>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org
Subject: pt_regs usage in cpuacct_charge()

Hello!

In cpuacct_charge() function pt_regs of other thread could be used. 
There is a such call chain: ...-> __schedule -> pick_next_task_fair -> 
load_balance -> idle_balance -> load_balance -> detach_tasks -> 
deactivate_task -> dequeue_task_fair -> dequeue_entity -> update_curr -> 
cpuacct_charge.

I think that pt_regs could disappeared or be changed. How it's assumed 
to syncronize pt_regs usage in this place?

Kernel verion 4.9.47-rt47.

Best regards,
Pavel V. Panteleev