From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <ian.campbell@citrix.com>
Subject: Re: [PATCH OSSTEST v3 22/22] Enable
 CONFIG_SPARSEMEM_VMEMMAP, arm64 seems to needs it (crashes).
Date: Fri, 26 Jun 2015 09:53:15 +0100
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On Wed, 2015-06-24 at 16:32 +0100, Ian Campbell wrote:
> TODO: Find out why!
> 
> This is just a placeholder/reminder, do not apply.

This turned out to be a known upstream issue (thanks to Mark Rutland for
the tip) which has just been fixed for 4.2 and tagged for stable
backport.

Ian.

> ---
>  ts-kernel-build | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/ts-kernel-build b/ts-kernel-build
> index 8d19482..67be9d9 100755
> --- a/ts-kernel-build
> +++ b/ts-kernel-build
> @@ -552,6 +552,9 @@ setopt CONFIG_AHCI_XGENE y
>  setopt CONFIG_POWER_RESET_XGENE y
>  setopt CONFIG_RTC_DRV_XGENE y
>  
> +#arm64 crashes without -- determine why
> +setopt CONFIG_SPARSEMEM_VMEMMAP y
> +
>  case ${XEN_TARGET_ARCH} in
>      x86_32) setopt CONFIG_64BIT n ;;
>      x86_64)