linux-kernel - Re: [3/4] powerpc/mm: Clean up memory hotplug failure paths

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Date:	Wed,  2 Mar 2016 09:21:19 +1100 (AEDT)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	David Gibson <david@...son.dropbear.id.au>, paulus@...ba.org,
	benh@...nel.crashing.org
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	David Gibson <david@...son.dropbear.id.au>
Subject: Re: [3/4] powerpc/mm: Clean up memory hotplug failure paths

On Tue, 2016-09-02 at 03:32:42 UTC, David Gibson wrote:
> This makes a number of cleanups to handling of mapping failures during
> memory hotplug on Power:
> 
> For errors creating the linear mapping for the hot-added region:
>   * This is now reported with EFAULT which is more appropriate than the
>     previous EINVAL (the failure is unlikely to be related to the
>     function's parameters)
>   * An error in this path now prints a warning message, rather than just
>     silently failing to add the extra memory.
>   * Previously a failure here could result in the region being partially
>     mapped.  We now clean up any partial mapping before failing.
> 
> For errors creating the vmemmap for the hot-added region:
>    * This is now reported with EFAULT instead of causing a BUG() - this
>      could happen for external reason (e.g. full hash table) so it's better
>      to handle this non-fatally
>    * An error message is also printed, so the failure won't be silent
>    * As above a failure could cause a partially mapped region, we now
>      clean this up.
> 
> Signed-off-by: David Gibson <david@...son.dropbear.id.au>
> Reviewed-by: Paul Mackerras <paulus@...ba.org>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/1dace6c665ec59bdc4eeafa4db

cheers