[tip:core/memblock] memblock: Allow memblock_init to be called early

tip-bot for Jeremy Fitzhardinge
2010-10-12T00:01:47Z

Commit-ID: 236260b90dd94516982ad67aa6f5449c4c37db7b
Gitweb: http://git.kernel.org/tip/236260b90dd94516982ad67aa6f5449c4c37db7b
Author: Jeremy Fitzhardinge <jeremy@goop.org>
AuthorDate: Wed, 6 Oct 2010 15:52:29 -0700
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Mon, 11 Oct 2010 15:59:01 -0700

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@citrix.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
LKML-Reference: <4CACFDAD.3090900@goop.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/xen/enlighten.c | 3 +++
mm/memblock.c | 6 ++++++
2 files changed, 9 insertions(+), 0 deletions(-)

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