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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z36PbN-s7YCR2HQi@arm.com>
Date: Wed, 8 Jan 2025 14:45:00 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Will Deacon <will@...nel.org>
Cc: Sangmoon Kim <sangmoon.kim@...sung.com>,
	Jonathan Corbet <corbet@....net>,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, ardb@...nel.org
Subject: Re: [PATCH] docs: arm64: update memory layout for vmemmap region

On Wed, Jan 08, 2025 at 01:57:48PM +0000, Will Deacon wrote:
> On Thu, Jan 02, 2025 at 03:52:37PM +0900, Sangmoon Kim wrote:
> > 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(-)
> 
> To be honest with you, this document is pretty stale (it doesn't even
> mention 16k pages) and almost impossible to keep in-sync with the code.
> I'd be inclined to remove these tables; we have ptdump support if people
> really want to see where things are.

I agree. They were somewhat useful in the early days when we didn't have
as many combinations but now they get outdated easily and I'm not sure
anyone still uses them as a reference.

-- 
Catalin