From mboxrd@z Thu Jan  1 00:00:00 1970
From: dyoung@redhat.com (Dave Young)
Date: Tue, 26 Dec 2017 09:35:17 +0800
Subject: arm64 crashkernel fails to boot on acpi-only machines due to
 ACPI regions being no longer mapped as NOMAP
In-Reply-To: <20171226013217.GA2119@dhcp-128-65.nay.redhat.com>
References: <20171219060927.GH28046@linaro.org>
 <CAKv+Gu-gmbWdZ7rxp5qGrtSBQ7dM=3FqF-Pw=J0LaL=oKTMg4w@mail.gmail.com>
 <CACi5LpOscbcBecWaC3Q9P22kheRYc+M2Ynfusszk14fPY-cJ5A@mail.gmail.com>
 <20171221103440.GJ28046@linaro.org>
 <CACi5LpMUnUKxiALAHW9_PE2RYC8GNWLPGpdJ5ca53g=v3rNkfg@mail.gmail.com>
 <20171222083308.cy3vwlyhig22q5ee@fireball>
 <CACi5LpNF5i3Eo7nMLr_z9r4VVbXhDwSJCQoiOh-A_jB6hV0_2Q@mail.gmail.com>
 <20171225032500.GA8877@linaro.org>
 <CACi5LpMzYidDaC0_yfwgVOisH-FqcNViYj+Z54uKfUtHkJKKXA@mail.gmail.com>
 <20171226013217.GA2119@dhcp-128-65.nay.redhat.com>
Message-ID: <20171226013517.GA2186@dhcp-128-65.nay.redhat.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

[snip]
> > > Well, we may be able to change pr_warn() to pr_warn_once() here, but
> > > I hope that adding "numa=off" to kernel command line should also work.
> > 
> > Hmm, adding "numa=off" to crashkernel bootargs works, and TBH it was
> > my initial thought process as well, but I am not sure if this will
> > cause any regressions on aarch64 systems which use crashdump feature.
> 
> It should be fine since we use numa=off by default for all other arches
> ie. x86, ppc64 and s390. Actually disabling numa in kdump kernel can save
> mm component memory usage. 
> 

Forgot to say I means in RHEL and Fedora we use numa=off for kdump..