linux-kernel - Re: [PATCH REPOST] kexec: return error of machine

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Message-ID: <51DCB585.9030105@cn.fujitsu.com>
Date:	Wed, 10 Jul 2013 09:14:45 +0800
From:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	Eric Biederman <ebiederm@...ssion.com>, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH REPOST] kexec: return error of machine_kexec() fails

于 2013/7/10 0:16, Stephen Warren 写道:
> From: Stephen Warren <swarren@...dia.com>
> 
> Prior to commit 3ab8352 "kexec jump", if machine_kexec() returned,
> sys_reboot() would return -EINVAL. This patch restores this behaviour
> for the non-KEXEC_JUMP case, where machine_kexec() is not expected to
> return.
> 
> This situation can occur on ARM, where kexec requires disabling all but
> one CPU using CPU hotplug. However, if hotplug isn't supported by the
> particular HW the kernel is running on, then kexec cannot succeed.

I don't have an ARM machine, but I believe you are right by reading the
code. So

Acked-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>

> 
> Signed-off-by: Stephen Warren <swarren@...dia.com>
> Acked-by: Will Deacon <will.deacon@....com>
> ---
>  kernel/kexec.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index 59f7b55..bde1190 100644
> --- a/kernel/kexec.c
> +++ b/kernel/kexec.c
> @@ -1702,6 +1702,8 @@ int kernel_kexec(void)
>  		pm_restore_console();
>  		unlock_system_sleep();
>  	}
> +#else
> +	error = -EINVAL;
>  #endif
>  
>   Unlock:
> 


-- 
Thanks.
Zhang Yanfei
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