linux-kernel - [PATCH] docs: arm64: update memory layout for vmemmap region

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Message-ID: <20250102065554.1533781-1-sangmoon.kim@samsung.com>
Date: Thu,  2 Jan 2025 15:52:37 +0900
From: Sangmoon Kim <sangmoon.kim@...sung.com>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon
	<will@...nel.org>, Jonathan Corbet <corbet@....net>
Cc: Sangmoon Kim <sangmoon.kim@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] docs: arm64: update memory layout for vmemmap region

Commit 031e011d8b22 ("arm64: mm: Move PCI I/O emulation region above
the vmemmap region") and commit b730b0f2b1fc ("arm64: mm: Move fixmap
region above vmemmap region") have placed PCI I/O and fixmap region
above vmemmap region.

And commit 32697ff38287 ("arm64: vmemmap: Avoid base2 order of struct
page size to dimension region") has moved vmemmap region to higher
address.

Update document as the memory layout modified by the previous patches.

Signed-off-by: Sangmoon Kim <sangmoon.kim@...sung.com>
---
 Documentation/arch/arm64/memory.rst | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/Documentation/arch/arm64/memory.rst b/Documentation/arch/arm64/memory.rst
index 8a658984b8bb..43c15cea2ec9 100644
--- a/Documentation/arch/arm64/memory.rst
+++ b/Documentation/arch/arm64/memory.rst
@@ -32,13 +32,13 @@ AArch64 Linux memory layout with 4KB pages + 4 levels (48-bit)::
   ffff000000000000	ffff7fffffffffff	 128TB		kernel logical memory map
  [ffff600000000000	ffff7fffffffffff]	  32TB		[kasan shadow region]
   ffff800000000000	ffff80007fffffff	   2GB		modules
-  ffff800080000000	fffffbffefffffff	 124TB		vmalloc
-  fffffbfff0000000	fffffbfffdffffff	 224MB		fixed mappings (top down)
-  fffffbfffe000000	fffffbfffe7fffff	   8MB		[guard region]
-  fffffbfffe800000	fffffbffff7fffff	  16MB		PCI I/O space
-  fffffbffff800000	fffffbffffffffff	   8MB		[guard region]
-  fffffc0000000000	fffffdffffffffff	   2TB		vmemmap
-  fffffe0000000000	ffffffffffffffff	   2TB		[guard region]
+  ffff800080000000	fffffdffbf7fffff	 126TB		vmalloc
+  fffffdffbf800000	fffffdffbfffffff	   8MB		[guard region]
+  fffffdffc0000000	ffffffffbfffffff	   2TB		vmemmap
+  ffffffffc0000000	ffffffffc07fffff	   8MB		[guard region]
+  ffffffffc0800000	ffffffffc17fffff	  16MB		PCI I/O	space
+  ffffffffc1800000	ffffffffff7fffff	 992MB		fixed mappings (top down)
+  ffffffffff800000	ffffffffffffffff	   8MB		[guard region]
 
 
 AArch64 Linux memory layout with 64KB pages + 3 levels (52-bit with HW support)::
@@ -49,13 +49,13 @@ AArch64 Linux memory layout with 64KB pages + 3 levels (52-bit with HW support):
   fff0000000000000	ffff7fffffffffff	  ~4PB		kernel logical memory map
  [fffd800000000000	ffff7fffffffffff]	 512TB		[kasan shadow region]
   ffff800000000000	ffff80007fffffff	   2GB		modules
-  ffff800080000000	fffffbffefffffff	 124TB		vmalloc
-  fffffbfff0000000	fffffbfffdffffff	 224MB		fixed mappings (top down)
-  fffffbfffe000000	fffffbfffe7fffff	   8MB		[guard region]
-  fffffbfffe800000	fffffbffff7fffff	  16MB		PCI I/O space
-  fffffbffff800000	fffffbffffffffff	   8MB		[guard region]
-  fffffc0000000000	ffffffdfffffffff	  ~4TB		vmemmap
-  ffffffe000000000	ffffffffffffffff	 128GB		[guard region]
+  ffff800080000000	fffffc1fbf7fffff	 124TB		vmalloc
+  fffffc1fbf800000	fffffc1fbfffffff	   8MB		[guard region]
+  fffffc1fc0000000	ffffffffbfffffff	  ~4TB		vmemmap
+  ffffffffc0000000	ffffffffc07fffff	   8MB		[guard region]
+  ffffffffc0800000	ffffffffc17fffff	  16MB		PCI I/O space
+  ffffffffc1800000	ffffffffff7fffff	 992MB		fixed mappings (top down)
+  ffffffffff800000	ffffffffffffffff	   8MB		[guard region]
 
 
 Translation table lookup with 4KB pages::
-- 
2.47.1