From: Zhen Lei <thunder.leizhen@huawei.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
<x86@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>,
<linux-kernel@vger.kernel.org>, Dave Young <dyoung@redhat.com>,
Baoquan He <bhe@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
Eric Biederman <ebiederm@xmission.com>,
<kexec@lists.infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
"Will Deacon" <will@kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
<devicetree@vger.kernel.org>, Jonathan Corbet <corbet@lwn.net>,
<linux-doc@vger.kernel.org>
Cc: Zhen Lei <thunder.leizhen@huawei.com>,
Randy Dunlap <rdunlap@infradead.org>,
Feng Zhou <zhoufeng.zf@bytedance.com>,
Kefeng Wang <wangkefeng.wang@huawei.com>,
Chen Zhou <dingguo.cz@antgroup.com>,
"John Donnelly" <John.p.donnelly@oracle.com>,
Dave Kleikamp <dave.kleikamp@oracle.com>
Subject: [PATCH v21 5/5] docs: kdump: Update the crashkernel description for arm64
Date: Sun, 27 Feb 2022 11:07:17 +0800 [thread overview]
Message-ID: <20220227030717.1464-6-thunder.leizhen@huawei.com> (raw)
In-Reply-To: <20220227030717.1464-1-thunder.leizhen@huawei.com>
Now arm64 has added support for "crashkernel=X,high" and
"crashkernel=Y,low", and implements "crashkernel=X[@offset]" in the
same way as x86. So update the Documentation.
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
Documentation/admin-guide/kernel-parameters.txt | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f5a27f067db9ed9..63098786c93828c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -789,7 +789,7 @@
memory region [offset, offset + size] for that kernel
image. If '@offset' is omitted, then a suitable offset
is selected automatically.
- [KNL, X86-64] Select a region under 4G first, and
+ [KNL, X86-64, ARM64] Select a region under 4G first, and
fall back to reserve region above 4G when '@offset'
hasn't been specified.
See Documentation/admin-guide/kdump/kdump.rst for further details.
@@ -802,20 +802,20 @@
Documentation/admin-guide/kdump/kdump.rst 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
requires at least 64M+32K low memory, also enough extra
low memory is needed to make sure DMA buffers for 32-bit
- devices won't run out. Kernel would try to allocate at
+ devices won't run out. Kernel would try to allocate
at least 256M below 4G automatically.
This one let user to specify own low range under 4G
for second kernel instead.
--
2.25.1
next prev parent reply other threads:[~2022-02-27 3:07 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-27 3:07 [PATCH v21 0/5] support reserving crashkernel above 4G on arm64 kdump Zhen Lei
2022-02-27 3:07 ` [PATCH v21 1/5] kdump: return -ENOENT if required cmdline option does not exist Zhen Lei
2022-03-15 11:57 ` Baoquan He
2022-03-15 12:21 ` Baoquan He
2022-03-15 13:32 ` Leizhen (ThunderTown)
2022-03-16 5:17 ` Baoquan He
2022-03-16 5:39 ` Baoquan He
2022-03-16 6:15 ` Leizhen (ThunderTown)
2022-02-27 3:07 ` [PATCH v21 2/5] arm64: Use insert_resource() to simplify code Zhen Lei
2022-02-27 3:07 ` [PATCH v21 3/5] arm64: kdump: reimplement crashkernel=X Zhen Lei
2022-03-16 12:11 ` Baoquan He
2022-03-16 13:11 ` Leizhen (ThunderTown)
2022-03-17 2:36 ` Baoquan He
2022-03-17 3:19 ` Leizhen (ThunderTown)
2022-03-17 3:47 ` Baoquan He
2022-03-17 7:30 ` Leizhen (ThunderTown)
2022-03-17 2:38 ` Baoquan He
2022-03-17 3:23 ` Leizhen (ThunderTown)
2022-03-21 13:29 ` John Donnelly
2022-03-21 14:09 ` Dave Kleikamp
2022-03-22 1:58 ` Leizhen (ThunderTown)
2022-02-27 3:07 ` [PATCH v21 4/5] of: fdt: Add memory for devices by DT property "linux,usable-memory-range" Zhen Lei
2022-02-27 3:07 ` Zhen Lei [this message]
2022-03-15 11:59 ` [PATCH v21 5/5] docs: kdump: Update the crashkernel description for arm64 Baoquan He
2022-04-08 9:32 ` [PATCH v21 0/5] support reserving crashkernel above 4G on arm64 kdump Baoquan He
2022-04-08 9:47 ` Leizhen (ThunderTown)
2022-04-11 2:56 ` Baoquan He
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