From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [PATCH v3 11/13] xen: arm: enable synchronous
 console while starting secondary CPUs
Date: Mon, 25 Nov 2013 12:37:43 +0000
Message-ID: <52934497.1030705@linaro.org>
References: <1385377561.22002.22.camel@kazak.uk.xensource.com>
	<1385377625-20250-11-git-send-email-ian.campbell@citrix.com>
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To: Ian Campbell <ian.campbell@citrix.com>, xen-devel@lists.xen.org
Cc: Keir Fraser <keir@xen.org>, pranavkumar@linaro.org, tim@xen.org, Anup Patel <anup.patel@linaro.org>, stefano.stabellini@eu.citrix.com
List-Id: xen-devel@lists.xenproject.org



On 11/25/2013 11:07 AM, Ian Campbell wrote:
> Setting synchronous console ensures that any printk hits the buffer
> immediately and that any outstanding queued log messages are flushed. This
> ensures that such log messages are not being printed while the secondary CPU
> may be using early_printk during early bringup.
>
> Signed-of-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>
> Cc: Keir Fraser <keir@xen.org>
> ---
> v2: improved commit message.
> ---
>   xen/arch/arm/smpboot.c |    5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
> index 7636ab8..e862477 100644
> --- a/xen/arch/arm/smpboot.c
> +++ b/xen/arch/arm/smpboot.c
> @@ -28,6 +28,7 @@
>   #include <xen/softirq.h>
>   #include <xen/timer.h>
>   #include <xen/irq.h>
> +#include <xen/console.h>
>   #include <asm/gic.h>
>
>   cpumask_t cpu_online_map;
> @@ -356,6 +357,8 @@ int __cpu_up(unsigned int cpu)
>       if ( rc < 0 )
>           return rc;
>
> +    console_start_sync(); /* Secondary may use early_printk */
> +
>       /* Tell the remote CPU which stack to boot on. */
>       init_data.stack = idle_vcpu[cpu]->arch.stack;
>
> @@ -368,6 +371,8 @@ int __cpu_up(unsigned int cpu)
>
>       rc = arch_cpu_up(cpu);
>
> +    console_end_sync();
> +
>       if ( rc < 0 )
>       {
>           printk("Failed to bring up CPU%d\n", cpu);
>

-- 
Julien Grall