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

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Message-ID: <20250109024459.2632388-1-sangmoon.kim@samsung.com>
Date: Thu,  9 Jan 2025 11:44:36 +0900
From: Sangmoon Kim <sangmoon.kim@...sung.com>
To: will@...nel.org
Cc: ardb@...nel.org, catalin.marinas@....com, corbet@....net,
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, sangmoon.kim@...sung.com
Subject: RE: [PATCH] docs: arm64: update memory layout for vmemmap region


> -----Original Message-----
> From: Will Deacon <will@...nel.org>
> Sent: Wednesday, January 8, 2025 10:58 PM
> 
> 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.
> 
> Will
> 

I get it. Thank you for your answer.

Sangmoon