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From: Juergen Gross <jgross@suse.com>
To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
	x86@kernel.org, corbet@lwn.net, Juergen Gross <jgross@suse.com>
Subject: [PATCH] doc: correct Documentation/x86/x86_64/mm.txt
Date: Fri, 22 Apr 2016 09:35:04 +0200
Message-ID: <1461310504-15977-1-git-send-email-jgross@suse.com> (raw)

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

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 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).
-- 
2.6.6

             reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-22  7:35 Juergen Gross [this message]
2016-04-22  9:47 ` [tip:x86/asm] x86/doc: Correct limits in Documentation/x86/x86_64/mm.txt tip-bot for Juergen Gross

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