linux-kernel - Re: powerpc/corenet: use the mixed mode of MPIC when enabling CPU hotplug

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Tue, 4 Aug 2015 19:16:26 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	chenhui zhao <chenhui.zhao@...escale.com>
CC:	<linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>,
	<Jason.Jin@...escale.com>
Subject: Re: powerpc/corenet: use the mixed mode of MPIC when enabling CPU
 hotplug

On Thu, Jul 23, 2015 at 11:55:45AM +0800, chenhui zhao wrote:
> Core reset may cause issue if using the proxy mode of MPIC.
> Use the mixed mode of MPIC if enabling CPU hotplug.
> 
> Signed-off-by: Chenhui Zhao <chenhui.zhao@...escale.com>
> ---
>  arch/powerpc/platforms/85xx/corenet_generic.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/arch/powerpc/platforms/85xx/corenet_generic.c b/arch/powerpc/platforms/85xx/corenet_generic.c
> index bd839dc..0119224 100644
> --- a/arch/powerpc/platforms/85xx/corenet_generic.c
> +++ b/arch/powerpc/platforms/85xx/corenet_generic.c
> @@ -212,7 +212,15 @@ define_machine(corenet_generic) {
>  	.pcibios_fixup_bus	= fsl_pcibios_fixup_bus,
>  	.pcibios_fixup_phb      = fsl_pcibios_fixup_phb,
>  #endif
> +/*
> + * Core reset may cause issue if using the proxy mode of MPIC.
> + * So, use the mixed mode of MPIC if enabling CPU hotplug.
> + */
> +#ifdef CONFIG_HOTPLUG_CPU
> +	.get_irq		= mpic_get_irq,
> +#else
>  	.get_irq		= mpic_get_coreint_irq,
> +#endif

Between this and kexec needing the same thing, I'm wondering if we should
just drop support for coreint.  Do you have any benchmarks for the
performance impact of this patch?

Is there an erratum for the hardware problem?

-Scott
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/