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

[Catalin Marinas <catalin.marinas@arm.com>]

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@samsung.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as many combinations but now they get outdated easily and I'm not sure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