linux-kernel - Re: [PATCH v8 1/2] x86/kexec: add a new atomic notifier list for kdump

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Message-ID: <87haobolvw.fsf@xmission.com>
Date:	Mon, 26 Nov 2012 19:49:39 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc:	Gleb Natapov <gleb@...hat.com>, "x86\@kernel.org" <x86@...nel.org>,
	"kexec\@lists.infradead.org" <kexec@...ts.infradead.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm\@vger.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH v8 1/2] x86/kexec: add a new atomic notifier list for kdump

Zhang Yanfei <zhangyanfei@...fujitsu.com> writes:

> So in summary,
>
> 1. a specific callback function instead of a notifier?

Yes.

> 2. Instead of calling vmclear_local_loaded_vmcss, the vmclear operation
>    will just call the vmclear on every vmcss loaded on the cpu?
>
>    like below:
>
>    static void crash_vmclear_local_loaded_vmcss(void)
>    {
>         int cpu = raw_smp_processor_id();
>         struct loaded_vmcs *v, *n;
>
>         if (!crash_local_vmclear_enabled(cpu))
>                 return;
>
>         list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu),
>                                  loaded_vmcss_on_cpu_link)
>                 vmcs_clear(v->vmcs);
>    }
>
>    right?

Yeah that looks good.  I would do list_for_each_entry because the list
isn't changing.

Eric
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