linux-kernel - Re: [PATCH v1 1/2] ACPI / boot: Correct address space of __acpi_map

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Message-ID: <CAHp75Vc0tCVakHm6oaC5JVM1yZ2oE_8evi2UZm2X98oNXM3k2A@mail.gmail.com>
Date:   Mon, 17 Jul 2017 12:57:14 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hanjun Guo <guohanjun@...wei.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v1 1/2] ACPI / boot: Correct address space of __acpi_map_table()

On Mon, Jul 17, 2017 at 12:49 PM, Hanjun Guo <guohanjun@...wei.com> wrote:
> On 2017/7/8 23:50, Andy Shevchenko wrote:
>> Sparse complains about wrong address space used in __acpi_map_table()
>> and in __acpi_unmap_table().
>>
>> arch/x86/kernel/acpi/boot.c:127:29: warning: incorrect type in return expression (different address spaces)
>> arch/x86/kernel/acpi/boot.c:127:29:    expected char *
>> arch/x86/kernel/acpi/boot.c:127:29:    got void [noderef] <asn:2>*
>> arch/x86/kernel/acpi/boot.c:135:23: warning: incorrect type in argument 1 (different address spaces)
>> arch/x86/kernel/acpi/boot.c:135:23:    expected void [noderef] <asn:2>*addr
>> arch/x86/kernel/acpi/boot.c:135:23:    got char *map
>>
>> Correct address space to be in align of type of returned and passed
>> parameter.

>> -char * __acpi_map_table (unsigned long phys_addr, unsigned long size);
>> -void __acpi_unmap_table(char *map, unsigned long size);
>> +void __iomem *__acpi_map_table(unsigned long phys_addr, unsigned long size);
>> +void __acpi_unmap_table(void __iomem *map, unsigned long size);
>
> This breaks ACPI compile on ARM64 as ARM64 has its definition for those
> two functions,

Oops, missed that, sorry.

> I see patches in linux-next already, should I add a patch on top
> to fix it, or this patch should be respined?

Whatever Rafael prefers. I'm fine with either.
I have more patches against that c-file, perhaps better to respin.

-- 
With Best Regards,
Andy Shevchenko