linux-kernel - Re: [PATCH 11/14] x86-32, NUMA: Make pgdat allocation use alloc

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Date:	Tue, 05 Apr 2011 12:14:24 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Tejun Heo <tj@...nel.org>
CC:	mingo@...hat.com, hpa@...or.com, tglx@...utronix.de,
	rientjes@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/14] x86-32, NUMA: Make pgdat allocation use alloc_remap()

On 04/04/2011 03:23 PM, Tejun Heo wrote:
> pgdat allocation is handled differnetly from other remap allocations -
> it's reserved during initialization.  There's no reason to handle this
> any differnetly.  Remap allocator is initialized for every node and if
> init failed the allocation will fail and pgdat allocation can fall
> back to generic code like anyone else.
>
> Remove special init-time pgdat reservation and make allocate_pgdat()
> use alloc_remap() like everyone else.
>
> Signed-off-by: Tejun Heo<tj@...nel.org>
> Cc: Yinghai Lu<yinghai@...nel.org>
> Cc: David Rientjes<rientjes@...gle.com>
> Cc: Thomas Gleixner<tglx@...utronix.de
> Cc: Ingo Molnar<mingo@...hat.com>
> Cc: "H. Peter Anvin"<hpa@...or.com>
> ---
>   arch/x86/mm/numa_32.c |    7 +++----
>   1 files changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
> index 53ec13a..0184a9f 100644
> --- a/arch/x86/mm/numa_32.c
> +++ b/arch/x86/mm/numa_32.c
> @@ -160,9 +160,8 @@ static void __init allocate_pgdat(int nid)
>   {
>   	char buf[16];
>
> -	if (node_has_online_mem(nid)&&  node_remap_start_vaddr[nid])
> -		NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
> -	else {
> +	NODE_DATA(nid) = alloc_remap(nid, ALIGN(sizeof(pg_data_t), PAGE_SIZE));
> +	if (!NODE_DATA(nid)) {
>   		unsigned long pgdat_phys;
>   		pgdat_phys = memblock_find_in_range(min_low_pfn<<PAGE_SHIFT,
>   				 max_pfn_mapped<<PAGE_SHIFT,
> @@ -301,7 +300,7 @@ static __init unsigned long init_alloc_remap(int nid, unsigned long offset)
>
>   	node_remap_start_vaddr[nid] = remap_va;
>   	node_remap_end_vaddr[nid] = remap_va + size;
> -	node_remap_alloc_vaddr[nid] = remap_va + ALIGN(sizeof(pg_data_t), PAGE_SIZE);
> +	node_remap_alloc_vaddr[nid] = remap_va;
>
>   	printk(KERN_DEBUG "remap_alloc: node %d [%08llx-%08llx) ->  [%p-%p)\n",
>   	       nid, node_pa, node_pa + size, remap_va, remap_va + size);

Acked-by: Yinghai Lu <yinghai@...nel.org>
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