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Date:   Tue, 15 Sep 2020 20:16:42 +0200
From:   peterz@infradead.org
To:     Michal Suchanek <msuchanek@suse.de>
Cc:     linuxppc-dev@lists.ozlabs.org,
        Michael Ellerman <mpe@ellerman.id.au>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Paul Mackerras <paulus@samba.org>,
        Nicholas Piggin <npiggin@gmail.com>,
        Santosh Sivaraj <santosh@fossix.org>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Ganesh Goudar <ganeshgr@linux.ibm.com>,
        Mahesh Salgaonkar <mahesh@linux.ibm.com>,
        Alistair Popple <alistair@popple.id.au>,
        Jordan Niethe <jniethe5@gmail.com>,
        Mike Rapoport <rppt@kernel.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH] Revert "powerpc/64s: machine check interrupt update NMI
 accounting"
Message-ID: <20200915181642.GF2674@hirez.programming.kicks-ass.net>
References: <20200915084302.GG29778@kitsune.suse.cz>
 <20200915180659.12503-1-msuchanek@suse.de>
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On Tue, Sep 15, 2020 at 08:06:59PM +0200, Michal Suchanek wrote:
> This reverts commit 116ac378bb3ff844df333e7609e7604651a0db9d.
> 
> This commit causes the kernel to oops and reboot when injecting a SLB
> multihit which causes a MCE.
> 
> Before this commit a SLB multihit was corrected by the kernel and the
> system continued to operate normally.
> 
> cc: stable@vger.kernel.org
> Fixes: 116ac378bb3f ("powerpc/64s: machine check interrupt update NMI accounting")
> Signed-off-by: Michal Suchanek <msuchanek@suse.de>

Ever since 69ea03b56ed2 ("hardirq/nmi: Allow nested nmi_enter()")
nmi_enter() supports nesting natively.