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Date:   Tue, 21 Aug 2018 17:23:05 -0400
From:   Masayoshi Mizuma <>
To:     Thomas Gleixner <>,
        Ingo Molnar <>,
        "H. Peter Anvin" <>,,
        Baoquan He <>
Cc:     Masayoshi Mizuma <>,
        Masayoshi Mizuma <>,
Subject: [PATCH v2 2/2] docs: kernel-parameters.txt: document rand_mem_physical_padding parameter

From: Masayoshi Mizuma <>

This kernel parameter allows to change the padding used for the physical
memory mapping section when KASLR memory is enabled.

For some systems, the default value, CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING,
is not enough. The option is useful to adjust the padding size to work
around such issue.

Signed-off-by: Masayoshi Mizuma <>
 Documentation/admin-guide/kernel-parameters.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 0c883029881a..97f54c910c9c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3477,6 +3477,13 @@
 	ramdisk_size=	[RAM] Sizes of RAM disks in kilobytes
 			See Documentation/blockdev/ramdisk.txt.
+	rand_mem_physical_padding=
+			[KNL] Define the padding size in terabytes
+			used for the physical memory mapping section
+			when KASLR memory is enabled.
+			The default value is
 	ras=option[,option,...]	[KNL] RAS-specific options
 		cec_disable	[X86]

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