From: Baoquan He <bhe@redhat.com>
To: mingo@kernel.org, linux-kernel@vger.kernel.org
Cc: keescook@chromium.org, dyoung@redhat.com,
douly.fnst@cn.fujitsu.com, dan.j.williams@intel.com,
Baoquan He <bhe@redhat.com>, Jonathan Corbet <corbet@lwn.net>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-doc@vger.kernel.org
Subject: [PATCH v3 3/3] Documentation/kernel-parameters.txt: Update 'memmap=' option description
Date: Wed, 26 Apr 2017 18:16:12 +0800 [thread overview]
Message-ID: <1493201772-19084-4-git-send-email-bhe@redhat.com> (raw)
In-Reply-To: <1493201772-19084-1-git-send-email-bhe@redhat.com>
In commit:
9710f581bb4c ("x86, mm: Let "memmap=" take more entries one time")
... 'memmap=' was changed to adopt multiple, comma delimited values in a
single entry, so update the related description.
In the special case of only specifying size value without an offset,
like memmap=nn[KMG], memmap behaves similarly to mem=nn[KMG], so update
it too here.
Furthermore, for memmap=nn[KMG]$ss[KMG], an escape character needs be added
before '$' for some bootloaders. E.g in grub2, if we specify memmap=100M$5G
as suggested by the documentation, "memmap=100MG" gets passed to the kernel.
Clarify all this.
Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-doc@vger.kernel.org
---
Documentation/admin-guide/kernel-parameters.txt | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 986e443..d518144 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2097,6 +2097,12 @@
memmap=nn[KMG]@ss[KMG]
[KNL] Force usage of a specific region of memory.
Region of memory to be used is from ss to ss+nn.
+ If @ss[KMG] is omitted, it equals to mem=nn[KMG]
+ which limits max address as nn[KMG].
+ Multiple different options can be put into one entry
+ with comma delimited to save space:
+ Example:
+ memmap=100M@2G,100M#3G,1G!1024G
memmap=nn[KMG]#ss[KMG]
[KNL,ACPI] Mark specific memory as ACPI data.
@@ -2109,6 +2115,9 @@
memmap=64K$0x18690000
or
memmap=0x10000$0x18690000
+ Some bootloaders may need escape character before '$',
+ like in grub2, otherwise '$' and the following number
+ will be eaten.
memmap=nn[KMG]!ss[KMG]
[KNL,X86] Mark specific memory as protected.
--
2.5.5
next prev parent reply other threads:[~2017-04-26 10:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-26 10:16 [PATCH v3 0/3] Handle memmap and mem kernel options in boot stage kaslr Baoquan He
2017-04-26 10:16 ` [PATCH v3 1/3] KASLR: Parse all memmap entries in cmdline Baoquan He
2017-04-28 19:37 ` Kees Cook
2017-04-29 10:12 ` Baoquan He
2017-04-26 10:16 ` [PATCH v3 2/3] KASLR: Handle memory limit specified by memmap and mem option Baoquan He
2017-04-28 19:39 ` Kees Cook
2017-04-29 10:14 ` Baoquan He
2017-04-26 10:16 ` Baoquan He [this message]
2017-04-27 19:57 ` [PATCH v3 0/3] Handle memmap and mem kernel options in boot stage kaslr YASUAKI ISHIMATSU
2017-04-28 23:02 ` Baoquan He
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