linux-kernel - Re: [RFC Patch V1 25/30] mm, x86, kvm: Use cpu_to_mem()/numa_mem

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Message-ID: <53BF95E1.3070908@redhat.com>
Date:	Fri, 11 Jul 2014 09:44:33 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Gleb Natapov <gleb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
CC:	Tony Luck <tony.luck@...el.com>, linux-mm@...ck.org,
	linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [RFC Patch V1 25/30] mm, x86, kvm: Use cpu_to_mem()/numa_mem_id()
 to support memoryless node

Il 11/07/2014 09:37, Jiang Liu ha scritto:
> When CONFIG_HAVE_MEMORYLESS_NODES is enabled, cpu_to_node()/numa_node_id()
> may return a node without memory, and later cause system failure/panic
> when calling kmalloc_node() and friends with returned node id.
> So use cpu_to_mem()/numa_mem_id() instead to get the nearest node with
> memory for the/current cpu.
>
> If CONFIG_HAVE_MEMORYLESS_NODES is disabled, cpu_to_mem()/numa_mem_id()
> is the same as cpu_to_node()/numa_node_id().
>
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> ---
>  arch/x86/kvm/vmx.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 801332edefc3..beb7c6d5d51b 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -2964,7 +2964,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
>
>  static struct vmcs *alloc_vmcs_cpu(int cpu)
>  {
> -	int node = cpu_to_node(cpu);
> +	int node = cpu_to_mem(cpu);
>  	struct page *pages;
>  	struct vmcs *vmcs;
>
>

Acked-by: Paolo Bonzini <pbonzini@...hat.com>
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