linux-kernel - [tip:x86/asm] x86/doc: Correct limits in Documentation/x86/x86

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Message-ID: <tip-78b0634d2851d30ec5d289aefbae23b141de67f0@git.kernel.org>
Date:	Fri, 22 Apr 2016 02:47:29 -0700
From:	tip-bot for Juergen Gross <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tglx@...utronix.de, peterz@...radead.org, hpa@...or.com,
	jgross@...e.com, mingo@...nel.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: [tip:x86/asm] x86/doc: Correct limits in
 Documentation/x86/x86_64/mm.txt

Commit-ID:  78b0634d2851d30ec5d289aefbae23b141de67f0
Gitweb:     http://git.kernel.org/tip/78b0634d2851d30ec5d289aefbae23b141de67f0
Author:     Juergen Gross <jgross@...e.com>
AuthorDate: Fri, 22 Apr 2016 09:35:04 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 22 Apr 2016 10:03:24 +0200

x86/doc: Correct limits in Documentation/x86/x86_64/mm.txt

Correct the size of the module mapping space and the maximum available
physical memory size of current processors.

Signed-off-by: Juergen Gross <jgross@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: corbet@....net
Cc: linux-doc@...r.kernel.org
Link: http://lkml.kernel.org/r/1461310504-15977-1-git-send-email-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 Documentation/x86/x86_64/mm.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt
index c518dce..5aa7383 100644
--- a/Documentation/x86/x86_64/mm.txt
+++ b/Documentation/x86/x86_64/mm.txt
@@ -19,7 +19,7 @@ ffffff0000000000 - ffffff7fffffffff (=39 bits) %esp fixup stacks
 ffffffef00000000 - ffffffff00000000 (=64 GB) EFI region mapping space
 ... unused hole ...
 ffffffff80000000 - ffffffffa0000000 (=512 MB)  kernel text mapping, from phys 0
-ffffffffa0000000 - ffffffffff5fffff (=1525 MB) module mapping space
+ffffffffa0000000 - ffffffffff5fffff (=1526 MB) module mapping space
 ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls
 ffffffffffe00000 - ffffffffffffffff (=2 MB) unused hole
 
@@ -31,8 +31,8 @@ vmalloc space is lazily synchronized into the different PML4 pages of
 the processes using the page fault handler, with init_level4_pgt as
 reference.
 
-Current X86-64 implementations only support 40 bits of address space,
-but we support up to 46 bits. This expands into MBZ space in the page tables.
+Current X86-64 implementations support up to 46 bits of address space (64 TB),
+which is our current limit. This expands into MBZ space in the page tables.
 
 We map EFI runtime services in the 'efi_pgd' PGD in a 64Gb large virtual
 memory window (this size is arbitrary, it can be raised later if needed).