linux-kernel - Re: [PATCH] powerpc: Save AMR/IAMR when switching tasks

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Message-ID: <fac9f731-627f-73e8-ca22-4214883f058b@csgroup.eu>
Date:   Mon, 14 Nov 2022 12:14:43 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Samuel Holland <samuel@...lland.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
CC:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Russell Currey <ruscur@...sell.cc>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] powerpc: Save AMR/IAMR when switching tasks



Le 26/10/2022 à 06:27, Samuel Holland a écrit :
> On 9/21/22 00:17, Christophe Leroy wrote:
>>
>> Instead of the patch from Michael, could you try by replacing
>> preempt_enable() by preempt_enable_no_resched() in exit_vmx_usercopy() ?
> 
> I finally got a chance to test this, and the simpler fix of using
> preempt_enable_no_resched() works as well.
> 

Thanks.

That should be fixed upstream now, by commit 
https://github.com/torvalds/linux/commit/00ff1eaac129a24516a3f6d75adfb9df1efb55dd

Christophe