linux-kernel - Re: [PATCH V4 05/23] ACPI: OSL: Make should_use

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Date:   Thu, 27 Apr 2023 13:24:58 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     Sunil V L <sunilvl@...tanamicro.com>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
        linux-crypto@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        llvm@...ts.linux.dev, Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, Len Brown <lenb@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Weili Qian <qianweili@...wei.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Marc Zyngier <maz@...nel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH V4 05/23] ACPI: OSL: Make should_use_kmap() 0 for RISC-V

Sunil V L <sunilvl@...tanamicro.com> writes:

>> An observation, which can be addressed later; The acpi_os_ioremap()
>> (called when the config above is enabled for RV), does not have an arch
>> specific implementation for RISC-V. The generic one calls
>> ioremap_cached(), which on RISC-V defaults to ioremap() -- caching
>> disabled/_PAGE_IO.
>> 
>> That is probably not what we want, but rather something similar that
>> arm64 does.
>> 
> Actually, for RISC-V acpi_os_ioremap() is currently a wrapper around
> memremap(). Sure, this can be enhanced in future if required.

Yeah, realized that when I continued thru the series!

Thanks for clearing it up!