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Message-ID: <66ad274d-9890-411d-9fba-90fed2eb33f5@kernel.org>
Date: Tue, 26 Mar 2024 19:06:59 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>,
Igor Pylypiv <ipylypiv@...gle.com>
Cc: Niklas Cassel <cassel@...nel.org>, John Garry <john.g.garry@...cle.com>,
Jason Yan <yanaijie@...wei.com>, "James E.J. Bottomley"
<jejb@...ux.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>,
Jack Wang <jinpu.wang@...ud.ionos.com>, Hannes Reinecke <hare@...e.de>,
Xiang Chen <chenxiang66@...ilicon.com>,
Artur Paszkiewicz <artur.paszkiewicz@...el.com>,
Bart Van Assche <bvanassche@....org>, TJ Adams <tadamsjr@...gle.com>,
linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 2/7] scsi: libsas: Define NCQ Priority sysfs attributes
for SATA devices
On 3/26/24 18:53, Geert Uytterhoeven wrote:
> Hi Igor,
>
> On Thu, Mar 7, 2024 at 10:55 PM Igor Pylypiv <ipylypiv@...gle.com> wrote:
>> Libata sysfs attributes cannot be used for libsas managed SATA devices
>> because the ata_port location is different for libsas.
>>
>> Defined sysfs attributes (visible for SATA devices only):
>> - /sys/block/sda/device/ncq_prio_enable
>> - /sys/block/sda/device/ncq_prio_supported
>>
>> The newly defined attributes will pass the correct ata_port to libata
>> helper functions.
>>
>> Reviewed-by: John Garry <john.g.garry@...cle.com>
>> Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
>> Reviewed-by: Jason Yan <yanaijie@...wei.com>
>> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>
>
> Thanks for your patch, which is now commit b4d3ddd2df7531e3 ("scsi:
> libsas: Define NCQ Priority sysfs attributes for SATA devices")
> in scsi-mkp/for-next
>
>> --- a/drivers/scsi/libsas/sas_ata.c
>> +++ b/drivers/scsi/libsas/sas_ata.c
>
>> +
>> +DEVICE_ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
>> +
>
> [...]
>
>> +
>> +DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
>> + sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
>> +
>
> When both CONFIG_SCSI_SAS_ATA and CONFIG_SATA_HOST are enabled:
I have both enabled in my config and I do not see any issue. What is special
with these on ARM ?
>
> aarch64-linux-gnu-ld: drivers/ata/libata-sata.o:(.data+0x110):
> multiple definition of `dev_attr_ncq_prio_supported';
> drivers/scsi/libsas/sas_ata.o:(.data+0x260): first defined here
> aarch64-linux-gnu-ld: drivers/ata/libata-sata.o:(.data+0xd8): multiple
> definition of `dev_attr_ncq_prio_enable';
> drivers/scsi/libsas/sas_ata.o:(.data+0x228): first defined here
>
> Making both new DEVICE_ATTR() declarations static doesn't work,
> as <linux/libata.h> contains a forward declaration for the existing global
> dev_attr_ncq_prio_supported in libata:
>
> In file included from include/linux/async.h:14,
> from drivers/scsi/libsas/sas_ata.c:12:
> include/linux/device.h:156:33: error: static declaration of
> ‘dev_attr_ncq_prio_supported’ follows non-static declaration
> 156 | struct device_attribute dev_attr_##_name =
> __ATTR(_name, _mode, _show, _store)
> | ^~~~~~~~~
> drivers/scsi/libsas/sas_ata.c:984:8: note: in expansion of macro ‘DEVICE_ATTR’
> 984 | static DEVICE_ATTR(ncq_prio_supported, S_IRUGO,
> sas_ncq_prio_supported_show,
> | ^~~~~~~~~~~
> In file included from include/scsi/sas_ata.h:13,
> from drivers/scsi/libsas/sas_ata.c:15:
> include/linux/libata.h:508:32: note: previous declaration of
> ‘dev_attr_ncq_prio_supported’ with type ‘struct device_attribute’
> 508 | extern struct device_attribute dev_attr_ncq_prio_supported;
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> In file included from include/linux/async.h:14,
> from drivers/scsi/libsas/sas_ata.c:12:
> include/linux/device.h:156:33: error: static declaration of
> ‘dev_attr_ncq_prio_enable’ follows non-static declaration
> 156 | struct device_attribute dev_attr_##_name =
> __ATTR(_name, _mode, _show, _store)
> | ^~~~~~~~~
> drivers/scsi/libsas/sas_ata.c:1023:8: note: in expansion of macro ‘DEVICE_ATTR’
> 1023 | static DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
> | ^~~~~~~~~~~
> In file included from include/scsi/sas_ata.h:13,
> from drivers/scsi/libsas/sas_ata.c:15:
> include/linux/libata.h:509:32: note: previous declaration of
> ‘dev_attr_ncq_prio_enable’ with type ‘struct device_attribute’
> 509 | extern struct device_attribute dev_attr_ncq_prio_enable;
> | ^~~~~~~~~~~~~~~~~~~~~~~~
>
> Perhaps the new attributes can be renamed?
> Alternatively, the DEVICE_ATTR() can be open-coded, so the actual
> device_attribute structures are named differently.
>
> Gr{oetje,eeting}s,
>
> Geert
>
--
Damien Le Moal
Western Digital Research
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