linux-kernel - RE: [PATCH] powerpc: Fix lazy preemption for powerpc 32bit

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Message-ID: <95ef76b973f947fea9044b685e835de2@omicronenergy.com>
Date:   Thu, 19 Mar 2020 14:45:09 +0000
From:   Thomas Graziadei <thomas.graziadei@...cronenergy.com>
To:     "'Sebastian Andrzej Siewior'" <bigeasy@...utronix.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>
Subject: RE: [PATCH] powerpc: Fix lazy preemption for powerpc 32bit

> From: Sebastian Andrzej Siewior [mailto:bigeasy@...utronix.de] 
> On 2020-03-18 21:26:40 [+0100], Thomas Graziadei wrote:
>> From: Thomas Graziadei <thomas.graziadei@...cronenergy.com>
>> 
>> The 32bit powerpc assembler implementation of the lazy preemption set 
>> the _TIF_PERSYSCALL_MASK on the low word. This could lead to modprobe 
>> segfaults and a kernel panic - not syncing: Attempt to kill init! 
>> issue.
>> 
>> Fixed by shifting the mask by 16 bit using andis and lis.
>
> bah. Thank you for catching this.
> Still e500 based powerpc I assume?

Well thanks for the great work and yes still e500 powerpc based.

>
>> Signed-off-by: Thomas Graziadei <thomas.graziadei@...cronenergy.com>
>
> Sebastian

Thomas