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Message-ID: <20190403030546.23718-4-chenzhou10@huawei.com> Date: Wed, 3 Apr 2019 11:05:46 +0800 From: Chen Zhou <chenzhou10@...wei.com> To: <catalin.marinas@....com>, <will.deacon@....com>, <akpm@...ux-foundation.org>, <rppt@...ux.ibm.com>, <ard.biesheuvel@...aro.org>, <takahiro.akashi@...aro.org> CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, <kexec@...ts.infradead.org>, <linux-mm@...ck.org>, <wangkefeng.wang@...wei.com>, Chen Zhou <chenzhou10@...wei.com> Subject: [PATCH 3/3] kdump: update Documentation about crashkernel on arm64 Now we support crashkernel=X,[high,low] on arm64, update the Documentation. Signed-off-by: Chen Zhou <chenzhou10@...wei.com> --- Documentation/admin-guide/kernel-parameters.txt | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 27a5f8c..6772f4f 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -715,14 +715,14 @@ Documentation/kdump/kdump.txt for an example. crashkernel=size[KMG],high - [KNL, x86_64] range could be above 4G. Allow kernel + [KNL, x86_64, arm64] range could be above 4G. Allow kernel to allocate physical memory region from top, so could be above 4G if system have more than 4G ram installed. Otherwise memory region will be allocated below 4G, if available. It will be ignored if crashkernel=X is specified. crashkernel=size[KMG],low - [KNL, x86_64] range under 4G. When crashkernel=X,high + [KNL, x86_64, arm64] range under 4G. When crashkernel=X,high is passed, kernel could allocate physical memory region above 4G, that cause second kernel crash on system that require some amount of low memory, e.g. swiotlb -- 2.7.4
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