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Date: Wed, 26 Apr 2017 18:16:12 +0800 From: Baoquan He <bhe@...hat.com> To: mingo@...nel.org, linux-kernel@...r.kernel.org Cc: keescook@...omium.org, dyoung@...hat.com, douly.fnst@...fujitsu.com, dan.j.williams@...el.com, Baoquan He <bhe@...hat.com>, Jonathan Corbet <corbet@....net>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Andrew Morton <akpm@...ux-foundation.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Bjorn Helgaas <bhelgaas@...gle.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, linux-doc@...r.kernel.org Subject: [PATCH v3 3/3] Documentation/kernel-parameters.txt: Update 'memmap=' 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@...hat.com> Cc: Jonathan Corbet <corbet@....net> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Cc: Bjorn Helgaas <bhelgaas@...gle.com> Cc: Mauro Carvalho Chehab <mchehab@...nel.org> Cc: linux-doc@...r.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
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