On Tue, Feb 11, 2025 at 09:20:22AM +0800, Chunyan Zhang wrote:
On Thu, 30 Jan 2025 at 16:42, Björn Töpel <bjorn@xxxxxxxxxx> wrote:
Chunyan Zhang <zhangchunyan@xxxxxxxxxxx> 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.
Please keep in mind that even after claiming back devmap PTE SW bit, a compile
time decision to select between uffd-wp and soft-dirty is not desirable.
Thanks,
Chunyan
Björn
[1] https://lore.kernel.org/linux-mm/cover.11189864684e31260d1408779fac9db80122047b.1736488799.git-series.apopple@xxxxxxxxxx/
