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

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Message-ID: <20200319142452.dqmkuruts3i6wjyt@linutronix.de>
Date:   Thu, 19 Mar 2020 15:24:52 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Thomas Graziadei <thomas.graziadei@...cronenergy.com>
Cc:     linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        tglx@...utronix.de, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH] powerpc: Fix lazy preemption for powerpc 32bit

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?

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

Sebastian