linux-kernel - Re: [PATCH 0/4] memblock related fixes for -tip

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Message-ID: <4CACFECD.3090304@kernel.org>
Date:	Wed, 06 Oct 2010 15:57:17 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH 0/4] memblock related fixes for -tip

On 10/06/2010 03:52 PM, Jeremy Fitzhardinge wrote:
>  On 10/04/2010 02:57 PM, Yinghai Lu wrote:
>> Please check memblock related patches
>>
>> [PATCH 1/4] memblock: Fix big size with find_region()
>> [PATCH -v5 2/4] x86, memblock: Fix crashkernel allocation
>> [PATCH 3/4] x86, memblock: Remove __memblock_x86_find_in_range_size()
>> [PATCH 4/4] x86, mm, memblock, 32bit: Make add_highpages honor early reserved ranges
>>
>> first one should get into core/memblock branch, and others should be in x86/mm/memeblock branch
> 
> I also need this to avoid an early crash under Xen.  The Xen init code
> ends up calling memblock_x86_reserve_range() before
> x86_64_start_reservations().
> 
> Also in git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git
> memblock
> 
>     J
> 
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> Date: Tue, 21 Sep 2010 17:05:35 -0700
> Subject: [PATCH] memblock: allow memblock_init to be called early
> 
> The Xen setup code needs to call memblock_x86_reserve_range() very early,
> so allow it to initialize the memblock subsystem before doing so.  The
> second memblock_init() is ignored.
> 
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 7d46c84..63b83ce 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -30,6 +30,7 @@
>  #include <linux/console.h>
>  #include <linux/pci.h>
>  #include <linux/gfp.h>
> +#include <linux/memblock.h>
>  
>  #include <xen/xen.h>
>  #include <xen/interface/xen.h>
> @@ -1183,6 +1184,8 @@ asmlinkage void __init xen_start_kernel(void)
>  	local_irq_disable();
>  	early_boot_irqs_off();
>  
> +	memblock_init();
> +
>  	xen_raw_console_write("mapping kernel into physical memory\n");
>  	pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);
>  
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 9ad3969..ae8b06c 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -752,6 +752,12 @@ void __init memblock_analyze(void)
>  
>  void __init memblock_init(void)
>  {
> +	static int init_done __initdata = 0;
> +
> +	if (init_done)
> +		return;
> +	init_done = 1;
> +

How about
+	if (memblock.memory.regions)
+		return;	

>  	/* Hookup the initial arrays */
>  	memblock.memory.regions	= memblock_memory_init_regions;
>  	memblock.memory.max		= INIT_MEMBLOCK_REGIONS;
> 

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