linux-kernel - [PATCH part1 v6 5/6] x86, acpi, crash, kdump: Do reserve

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Message-ID: <524E215C.7020603@gmail.com>
Date:	Fri, 04 Oct 2013 10:01:00 +0800
From:	Zhang Yanfei <zhangyanfei.yes@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J . Wysocki" <rjw@...k.pl>, lenb@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu,
	"H. Peter Anvin" <hpa@...or.com>, Tejun Heo <tj@...nel.org>,
	Toshi Kani <toshi.kani@...com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Thomas Renninger <trenn@...e.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	mina86@...a86.com, gong.chen@...ux.intel.com,
	vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com,
	Rik van Riel <riel@...hat.com>, jweiner@...hat.com,
	prarit@...hat.com
CC:	"x86@...nel.org" <x86@...nel.org>, linux-doc@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>, linux-acpi@...r.kernel.org,
	imtangchen@...il.com, Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>
Subject: [PATCH part1 v6 5/6] x86, acpi, crash, kdump: Do reserve_crashkernel()
 after SRAT is parsed.

From: Tang Chen <tangchen@...fujitsu.com>

Memory reserved for crashkernel could be large. So we should not allocate
this memory bottom up from the end of kernel image.

When SRAT is parsed, we will be able to know whihc memory is hotpluggable,
and we can avoid allocating this memory for the kernel. So reorder
reserve_crashkernel() after SRAT is parsed.

Acked-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 arch/x86/kernel/setup.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index f0de629..b5e350d 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1120,8 +1120,6 @@ void __init setup_arch(char **cmdline_p)
 	acpi_initrd_override((void *)initrd_start, initrd_end - initrd_start);
 #endif
 
-	reserve_crashkernel();
-
 	vsmp_init();
 
 	io_delay_init();
@@ -1134,6 +1132,13 @@ void __init setup_arch(char **cmdline_p)
 	early_acpi_boot_init();
 
 	initmem_init();
+
+	/*
+	 * Reserve memory for crash kernel after SRAT is parsed so that it
+	 * won't consume hotpluggable memory.
+	 */
+	reserve_crashkernel();
+
 	memblock_find_dma_reserve();
 
 #ifdef CONFIG_KVM_GUEST
-- 
1.7.1
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