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Date:   Fri, 10 Aug 2018 12:21:38 -0400
From:   Masayoshi Mizuma <msys.mizuma@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:     Masayoshi Mizuma <msys.mizuma@...il.com>,
        linux-kernel@...r.kernel.org, Baoquan He <bhe@...hat.com>,
        Masayoshi Mizuma <m.mizuma@...fujitsu.com>
Subject: [PATCH 2/2] docs: kernel-parameters.txt: document rand_mem_physical_padding parameter

From: Masayoshi Mizuma <m.mizuma@...fujitsu.com>

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 <m.mizuma@...fujitsu.com>
---
 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 533ff5c..d977091 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3382,6 +3382,13 @@
 	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
+			CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING.
+
 	ras=option[,option,...]	[KNL] RAS-specific options
 
 		cec_disable	[X86]
-- 
2.18.0

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