linux-kernel - Re: [PATCH v3 2/3] hwmon: xgene: Add hwmon driver

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Message-ID: <20160907223705.GA31582@roeck-us.net>
Date:   Wed, 7 Sep 2016 15:37:05 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Hoan Tran <hotran@....com>, Jean Delvare <jdelvare@...e.com>,
        Jonathan Corbet <corbet@....net>,
        Rob Herring <robh+dt@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Ashwin Chaugule <ashwin.chaugule@...aro.org>,
        Duc Dang <dhdang@....com>, lho@....com,
        linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 2/3] hwmon: xgene: Add hwmon driver

On Wed, Sep 07, 2016 at 11:41:44PM +0200, Arnd Bergmann wrote:
> On Thursday, July 21, 2016 1:55:56 PM CEST Hoan Tran wrote:
> > +               ctx->comm_base_addr = cppc_ss->base_address;
> > +               if (ctx->comm_base_addr) {
> > +                       ctx->pcc_comm_addr =
> > +                                       acpi_os_ioremap(ctx->comm_base_addr,
> > +                                                       cppc_ss->length);
> > 
> 
> This causes the arm64 allmodconfig build to fail now, according to
> kernelci:
> 
>       1  ERROR: "memblock_is_memory" [drivers/hwmon/xgene-hwmon.ko] undefined!
> 
> Should this perhaps call ioremap() or memremap() instead?
> 
Hmmm ... almost sounds to me like blaming the messenger. e7cd190385d1 ("arm64:
mark reserved memblock regions explicitly in iomem") starts using a function
in acpi_os_ioremap() which is not exported. On top of that, memblock_is_memory()
is declared as __init_memblock, which makes me really uncomfortable.
If acpi_os_ioremap() must not be used by modules, and possibly only during
early (?) initialization, maybe its declaration should state those limitations ?

Thanks,
Guenter