linux-kernel - Re: [PATCH v3 02/38] ata: add HAS

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Message-ID: <c7315ca2-3ebf-7f3b-da64-9a74a995b0ae@opensource.wdc.com>
Date:   Wed, 15 Mar 2023 18:12:48 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
        linux-ide@...r.kernel.org
Subject: Re: [PATCH v3 02/38] ata: add HAS_IOPORT dependencies

On 3/15/23 17:39, Geert Uytterhoeven wrote:
> Hi Niklas,
> 
> On Tue, Mar 14, 2023 at 1:12 PM Niklas Schnelle <schnelle@...ux.ibm.com> wrote:
>> In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
>> not being declared. We thus need to add HAS_IOPORT as dependency for
>> those drivers using them.
>>
>> Co-developed-by: Arnd Bergmann <arnd@...nel.org>
>> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> 
> Thanks for your patch!
> 
>> --- a/drivers/ata/Kconfig
>> +++ b/drivers/ata/Kconfig
>> @@ -342,6 +342,7 @@ endif # HAS_DMA
>>
>>  config ATA_SFF
>>         bool "ATA SFF support (for legacy IDE and PATA)"
>> +       depends on HAS_IOPORT
>>         default y
>>         help
>>           This option adds support for ATA controllers with SFF
> 
> ATA_SFF is a dependency for lots of (S)ATA drivers.
> (at least) The following don't use I/O port access:
> 
>     CONFIG_SATA_RCAR (arm/arm64)
>     CONFIG_PATA_FALCON (m68k/atari and m68k/q40)
>     CONFIG_PATA_GAYLE (m68k/amiga)
>     CONFIG_PATA_BUDDHA (m68k/amiga)
> 
> (at least) The following can use either MMIO or I/O port accesses:
> 
>     CONFIG_PATA_PLATFORM (m68k/mac)

But for these arch/platforms, would there be any reason to not have HAS_IOPORT ?
It is supported right now, so we should have HAS_IOPORT for them.

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 

-- 
Damien Le Moal
Western Digital Research