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

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Message-ID: <2025091739-roundish-dropper-c4f6@gregkh>
Date: Wed, 17 Sep 2025 14:34:15 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Vivian Wang <wangruikang@...as.ac.cn>
Cc: stable@...r.kernel.org, Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, 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>,
	Yao Zi <ziyao@...root.org>
Subject: Re: riscv: Backport request for mmap address space fixes to 6.6

On Wed, Sep 17, 2025 at 08:03:08PM +0800, Vivian Wang wrote:
> 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.

Please submit a backported set of patches that you have properly fixed
up and tested to ensure that we get the backport correct, and we will be
glad to take them.

thanks,

greg k-h