[PATCH] ARM: keystone: add a work around to handle asynchronous external abort

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Mon, Aug 17, 2015 at 06:12:52PM -0400, Murali Karicheri wrote:
> Unfortunately, this patch causes boot to stop very early just after
> local_abt_enable() is called in early_trap_init(). Before and After applying
> the patch, here is what the boot log looks like. Do you see any issue with
> the patch diff shown below? Patch is applied on top of v4.2-rc7. I have some
> additional base port patches applied to boot kernel on my EVM based on a new
> SoC.

Try moving the call to local_abt_enable() below forward to the end of
devicemaps_init().  I suspect this is too early for the abort handlers
to reliably run.

> diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
> index d358226..381c4e4 100644
> --- a/arch/arm/kernel/traps.c
> +++ b/arch/arm/kernel/traps.c
> @@ -871,6 +871,11 @@ void __init early_trap_init(void *vectors_base)
> 
>         flush_icache_range(vectors, vectors + PAGE_SIZE * 2);
>         modify_domain(DOMAIN_USER, DOMAIN_CLIENT);
> +
> +       /* Enable imprecise aborts */
> +       local_abt_enable();
> +

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