Messages in this thread Patch in this message | | | From | Baoquan He <> | Subject | [PATCH v4 3/3] Documentation/kernel-parameters.txt: Update 'memmap=' option description | Date | Tue, 9 May 2017 13:57:52 +0800 |
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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 e4c9e0e..8d37f26 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2112,6 +2112,12 @@ 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. @@ -2124,6 +2130,9 @@ 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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