linux-kernel - Re: [PATCH] Revert "powerpc/64s: machine check interrupt update NMI accounting"

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Message-ID: <20200915181642.GF2674@hirez.programming.kicks-ass.net>
Date:   Tue, 15 Sep 2020 20:16:42 +0200
From:   peterz@...radead.org
To:     Michal Suchanek <msuchanek@...e.de>
Cc:     linuxppc-dev@...ts.ozlabs.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Santosh Sivaraj <santosh@...six.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Ganesh Goudar <ganeshgr@...ux.ibm.com>,
        Mahesh Salgaonkar <mahesh@...ux.ibm.com>,
        Alistair Popple <alistair@...ple.id.au>,
        Jordan Niethe <jniethe5@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] Revert "powerpc/64s: machine check interrupt update NMI
 accounting"

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@...r.kernel.org
> Fixes: 116ac378bb3f ("powerpc/64s: machine check interrupt update NMI accounting")
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>

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