linux-kernel - riscv: Backport request for mmap address space fixes to 6.6

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Message-ID: <b68478db-5a8c-4b5f-a4d1-f4202ca1f062@iscas.ac.cn>
Date: Wed, 17 Sep 2025 20:03:08 +0800
From: Vivian Wang <wangruikang@...as.ac.cn>
To: stable@...r.kernel.org, Paul Walmsley <pjw@...nel.org>,
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Charlie Jenkins <charlie@...osinc.com>, Yangyu Chen <cyy@...self.name>,
 Han Gao <rabenda.cn@...il.com>, Icenowy Zheng <uwu@...nowy.me>,
 Inochi Amaoto <inochiama@...il.com>, Vivian Wang <wangruikang@...as.ac.cn>,
 Yao Zi <ziyao@...root.org>
Subject: riscv: Backport request for mmap address space fixes to 6.6

Hi,

I would like to request backport of these two commits to 6.6.y:

b5b4287accd702f562a49a60b10dbfaf7d40270f ("riscv: mm: Use hint address in mmap if available")
2116988d5372aec51f8c4fb85bf8e305ecda47a0 ("riscv: mm: Do not restrict mmap address based on hint")

Together, they amount to disabling arch_get_mmap_end and
arch_get_mmap_base for riscv.

I would like to note that the first patch conflicts with commit
724103429a2d ("riscv: mm: Fixup compat arch_get_mmap_end") in the stable
linux-6.6.y branch. STACK_TOP_MAX should end up as TASK_SIZE, *not*
TASK_SIZE_64.

Thanks,
Vivian "dramforever" Wang