linux-kernel - Re: [PATCH 1/2] riscv: mm: add support for CONFIG_DEBUG

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Date:   Tue, 21 Jan 2020 20:38:51 -0800 (PST)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Zong Li <zong.li@...ive.com>
cc:     palmer@...belt.com, aou@...s.berkeley.edu,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] riscv: mm: add support for CONFIG_DEBUG_VIRTUAL

On Thu, 2 Jan 2020, Zong Li wrote:

> This patch implements CONFIG_DEBUG_VIRTUAL to do additional checks on
> virt_to_phys and __pa_symbol calls. virt_to_phys used for linear mapping
> check, and __pa_symbol used for kernel symbol check. In current RISC-V,
> kernel image maps to linear mapping area. If CONFIG_DEBUG_VIRTUAL is
> disable, these two functions calculate the offset on the address feded
> directly without any checks.

Reviewed-by: Paul Walmsley <paul.walmsley@...ive.com>
Tested-by: Paul Walmsley <paul.walmsley@...ive.com>


- Paul