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Subject: Re: [PATCH v2] poewrpc/mce: Fix SLB rebolting during MCE recovery
 path.
From: Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com>
To: linuxppc-dev <linuxppc-dev@ozlabs.org>,
 Michael Ellerman <mpe@ellerman.id.au>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
 Nicholas Piggin <npiggin@gmail.com>
References: <153500011126.9482.8367068862900987587.stgit@jupiter.in.ibm.com>
Date: Thu, 23 Aug 2018 12:02:11 +0530
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On 08/23/2018 10:26 AM, Mahesh J Salgaonkar wrote:
> From: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
> 
> With the powrpc next commit e7e81847478 (poewrpc/mce: Fix SLB rebolting
> during MCE recovery path.), the SLB error recovery is broken. The new
> change now does not add index value to RB[52-63] that selects the SLB
> entry while rebolting, instead it assumes that the shadow save area
> already have index embeded correctly in esid field. While all valid bolted
> save areas do contain index value set correctly, there is a case where
> 3rd (KSTACK_INDEX) entry for kernel stack does not embed index for NULL
> esid entry. This patch fixes that.
> 
> Without this patch the SLB rebolt code overwirtes the 1st entry of kernel
> linear mapping and causes SLB recovery to fail.
> 
> Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

Ignore this patch.. There are few spelling mistakes in this patch.. will
resend v2 again after fixing those.

Thanks,
-Mahesh.