[v2] poewrpc/mce: Fix SLB rebolting during MCE recovery path.

[Michael Ellerman]

On Thu, 2018-08-23 at 04:56:08 UTC, Mahesh J Salgaonkar wrote:
> From: Mahesh Salgaonkar <mahesh at 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 at linux.vnet.ibm.com>
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> Reviewed-by: Nicholas Piggin <npiggin at gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/0f52b3a00c789569d7ed822b5a6b30

cheers