linux-kernel - Re: [PATCH V5 1/3] riscv: mm: Prepare for reusing PTE RSW bit(9)

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Message-ID: <CAAfSe-tRFEXiXJ=tHVnXy4Kb6O7-E2Sr_xybLYxma=ypMhqz9w@mail.gmail.com>
Date: Tue, 11 Feb 2025 09:20:22 +0800
From: Chunyan Zhang <zhang.lyra@...il.com>
To: Björn Töpel <bjorn@...nel.org>
Cc: Chunyan Zhang <zhangchunyan@...as.ac.cn>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Alexandre Ghiti <alex@...ti.fr>, Andrew Morton <akpm@...ux-foundation.org>, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Alistair Popple <apopple@...dia.com>, linux-mm@...ck.org
Subject: Re: [PATCH V5 1/3] riscv: mm: Prepare for reusing PTE RSW bit(9)

On Thu, 30 Jan 2025 at 16:42, Björn Töpel <bjorn@...nel.org> wrote:
>
> Chunyan Zhang <zhangchunyan@...as.ac.cn> writes:
>
> > The PTE bit(9) on RISC-V is reserved for software, it is used by devmap
> > now which has to be disabled if we want to use bit(9) for other features,
> > since there's no more free PTE bit on RISC-V now.
> >
> > So to make ARCH_HAS_PTE_DEVMAP selectable, this patch uses it as
> > the build condition of devmap definitions.
>
> Heads-up: It seems like Alistair's series [1] that removes the devmap
> PTE bit will most likely land in 6.15.

Yes, I've been keeping an eye on Alistair's series, intended to update
this patchset after Alistair's patch that removes the devmap PTE bit
got merged.

Thanks,
Chunyan
>
>
> Björn
>
> [1] https://lore.kernel.org/linux-mm/cover.11189864684e31260d1408779fac9db80122047b.1736488799.git-series.apopple@nvidia.com/