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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Thomas Graziadei <thomas.graziadei@omicronenergy.com>
Cc: linux-kernel@vger.kernel.org, rostedt@goodmis.org,
	tglx@linutronix.de, linux-rt-users@vger.kernel.org
Subject: Re: [PATCH] powerpc: Fix lazy preemption for powerpc 32bit
Date: Thu, 19 Mar 2020 15:24:52 +0100	[thread overview]
Message-ID: <20200319142452.dqmkuruts3i6wjyt@linutronix.de> (raw)
In-Reply-To: <0c91d808-b077-408c-b120-99e806efaeb5@EXC03-ATKLA.omicron.at>

On 2020-03-18 21:26:40 [+0100], Thomas Graziadei wrote:
> From: Thomas Graziadei <thomas.graziadei@omicronenergy.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@omicronenergy.com>

Sebastian

  reply	other threads:[~2020-03-19 14:24 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-18 20:26 [PATCH] powerpc: Fix lazy preemption for powerpc 32bit Thomas Graziadei
2020-03-19 14:24 ` Sebastian Andrzej Siewior [this message]
2020-03-19 14:45   ` Thomas Graziadei

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