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| Started by | Baoquan He <bhe@redhat.com> |
|---|---|
| First post | 2017-05-13 07:50 +0200 |
| Last post | 2017-05-24 13:10 +0200 |
| Articles | 2 — 2 participants |
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[PATCH v5 3/3] Documentation/kernel-parameters.txt: Update 'memmap=' option description Baoquan He <bhe@redhat.com> - 2017-05-13 07:50 +0200
[tip:x86/boot] Documentation/kernel-parameters.txt: Update 'memmap=' boot option description tip-bot for Baoquan He <tipbot@zytor.com> - 2017-05-24 13:10 +0200
| From | Baoquan He <bhe@redhat.com> |
|---|---|
| Date | 2017-05-13 07:50 +0200 |
| Subject | [PATCH v5 3/3] Documentation/kernel-parameters.txt: Update 'memmap=' option description |
| Message-ID | <tGy6e-7M6-7@gated-at.bofh.it> |
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>
---
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 15f79c2..60d69aa 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2127,6 +2127,12 @@
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.
@@ -2139,6 +2145,9 @@
memmap=64K$0x18690000
or
memmap=0x10000$0x18690000
+ Some bootloaders may need escape character before '$',
+ like in grub2, otherwise '$' and the following number
+ will be eaten.
memmap=nn[KMG]!ss[KMG]
[KNL,X86] Mark specific memory as protected.
--
2.5.5
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| From | tip-bot for Baoquan He <tipbot@zytor.com> |
|---|---|
| Date | 2017-05-24 13:10 +0200 |
| Subject | [tip:x86/boot] Documentation/kernel-parameters.txt: Update 'memmap=' boot option description |
| Message-ID | <tKCkW-1Ap-23@gated-at.bofh.it> |
| In reply to | #1640841 |
Commit-ID: 8fcc9bc3eaa2ef8345e2b4b22e3a88804ac46337
Gitweb: http://git.kernel.org/tip/8fcc9bc3eaa2ef8345e2b4b22e3a88804ac46337
Author: Baoquan He <bhe@redhat.com>
AuthorDate: Sat, 13 May 2017 13:46:30 +0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 24 May 2017 09:50:27 +0200
Documentation/kernel-parameters.txt: Update 'memmap=' boot option description
In commit:
9710f581bb4c ("x86, mm: Let "memmap=" take more entries one time")
... 'memmap=' was changed to adopt multiple, comma delimited values in a
single entry, so update the related description.
In the special case of only specifying size value without an offset,
like memmap=nn[KMG], memmap behaves similarly to mem=nn[KMG], so update
it too here.
Furthermore, for memmap=nn[KMG]$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>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dan.j.williams@intel.com
Cc: douly.fnst@cn.fujitsu.com
Cc: dyoung@redhat.com
Cc: m.mizuma@jp.fujitsu.com
Link: http://lkml.kernel.org/r/1494654390-23861-4-git-send-email-bhe@redhat.com
[ Various spelling fixes. ]
Signed-off-by: Ingo Molnar <mingo@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 15f79c2..4e4c340 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2127,6 +2127,12 @@
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 is equivalent to mem=nn[KMG],
+ which limits max address to nn[KMG].
+ Multiple different regions can be specified,
+ comma delimited.
+ Example:
+ memmap=100M@2G,100M#3G,1G!1024G
memmap=nn[KMG]#ss[KMG]
[KNL,ACPI] Mark specific memory as ACPI data.
@@ -2139,6 +2145,9 @@
memmap=64K$0x18690000
or
memmap=0x10000$0x18690000
+ Some bootloaders may need an escape character before '$',
+ like Grub2, otherwise '$' and the following number
+ will be eaten.
memmap=nn[KMG]!ss[KMG]
[KNL,X86] Mark specific memory as protected.
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