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Date: Thu, 4 Jun 2026 16:34:49 -0600 (MDT)
From: Paul Walmsley <pjw@kernel.org>
To: Vivian Wang <wangruikang@iscas.ac.cn>
cc: Paul Walmsley <pjw@kernel.org>, Palmer Dabbelt <palmer@dabbelt.com>, 
    Alexandre Ghiti <alex@ghiti.fr>, linux-riscv@lists.infradead.org, 
    linux-kernel@vger.kernel.org, sophgo@lists.linux.dev, 
    stable@vger.kernel.org, Han Gao <gaohan@iscas.ac.cn>
Subject: Re: [PATCH 2/2] riscv: mm: Define DIRECT_MAP_PHYSMEM_END
In-Reply-To: <20260309-riscv-sparsemem-vmemmap-limits-v1-2-f40efe18e3cd@iscas.ac.cn>
Message-ID: <533b4094-e97c-1661-1ad2-4e7aea683f4f@kernel.org>
References: <20260309-riscv-sparsemem-vmemmap-limits-v1-0-f40efe18e3cd@iscas.ac.cn> <20260309-riscv-sparsemem-vmemmap-limits-v1-2-f40efe18e3cd@iscas.ac.cn>
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On Mon, 9 Mar 2026, Vivian Wang wrote:

> On RISC-V, the actual mappable range of physical address space is
> dependent on the current MMU mode i.e. satp_mode (See
> Documentation/arch/riscv/vm-layout.rst).
> 
> Define the DIRECT_MAP_PHYSMEM_END macro based on the existing virtual
> address space layout macros to expose this information to
> get_free_mem_region(). Otherwise, it returns a region that couldn't be
> mapped, which breaks ZONE_DEVICE.
> 
> Cc: <stable@vger.kernel.org> # v6.13+
> Tested-by: Han Gao <gaohan@iscas.ac.cn> # SG2044
> Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>

Thanks, queued for v7.2.


- Paul