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

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Message-ID: <87frl0snf6.fsf@all.your.base.are.belong.to.us>
Date: Thu, 30 Jan 2025 09:42:21 +0100
From: Björn Töpel <bjorn@...nel.org>
To: 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>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, Chunyan
 Zhang <zhang.lyra@...il.com>, Alistair Popple <apopple@...dia.com>,
 linux-mm@...ck.org
Subject: Re: [PATCH V5 1/3] riscv: mm: Prepare for reusing PTE RSW bit(9)

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.


Björn

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