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From: Yinghai Lu <yinghai@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
        "H. Peter Anvin" <hpa@zytor.com>
Cc: WANG Chao <chaowang@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        linux-kernel@vger.kernel.org
Subject: [PATCH 0/4] x86, kdump: Fix crashkernel high with old kexec-tools
Date: Tue,  2 Apr 2013 10:19:39 -0700
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Vivek found some problems with old kexec-tools.

We keep the old crashkernel=X to old behavoir, so it will not break
old tools.
Add crashkernel=X,high to support new kexec-tools that supports loading high.
when high is used, memblock will search from top to low.
if the allocated one is above 4G, kernel will try to auto allocate
72M under 4G for swiotlb.
user could crashkernel=Y,low to change 72M to other value.

Thanks

Yinghai