linux-kernel - [PATCH -v3 08/14] x86, mm: set memblock initial limit to 1M

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Date:	Tue,  4 Sep 2012 22:46:25 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH -v3 08/14] x86, mm: set memblock initial limit to 1M

memblock_x86_fill() could double memory array.
and we set max_pfn_mapped to 512M, so memory array could be around 512M.
So kdump will not get big range (like 512M) under 1024M.

Try to put it down under 1M, it could use about 4k or so.

Also we need this one when we try to only map ram range only later.
if the early double the range near 512M, and later init_mem_mapping()
first several range could under 512M, then after mapping get reset,
we will lose access the memblock memory array. but we are using
memblock memory array for iteration.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/kernel/setup.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c30c78c..68d1b2c 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -889,7 +889,7 @@ void __init setup_arch(char **cmdline_p)

 	cleanup_highmap();

-	memblock.current_limit = get_max_mapped();
+	memblock.current_limit = ISA_END_ADDRESS;
 	memblock_x86_fill();

 	/*
-- 
1.7.7

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