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[PATCH v6 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for SATA devices

Igor Pylypiv posted 7 patches 1 year, 9 months ago
There is a newer version of this series
[PATCH v6 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for SATA devices
Posted by Igor Pylypiv 1 year, 9 months ago 
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@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
---
 drivers/scsi/libsas/sas_ata.c | 94 +++++++++++++++++++++++++++++++++++
 include/scsi/sas_ata.h        |  6 +++
 2 files changed, 100 insertions(+)

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 12e2653846e3..04b0bd9a4e01 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -964,3 +964,97 @@ int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
 			       force_phy_id, &tmf_task);
 }
 EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
+
+static ssize_t sas_ncq_prio_supported_show(struct device *device,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct domain_device *ddev = sdev_to_domain_dev(sdev);
+	bool supported;
+	int rc;
+
+	/* This attribute shall be visible for SATA devices only */
+	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
+		return -EINVAL;
+
+	rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported);
+	if (rc)
+		return rc;
+
+	return sysfs_emit(buf, "%d\n", supported);
+}
+
+DEVICE_ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
+
+static ssize_t sas_ncq_prio_enable_show(struct device *device,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct domain_device *ddev = sdev_to_domain_dev(sdev);
+	bool enabled;
+	int rc;
+
+	/* This attribute shall be visible for SATA devices only */
+	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
+		return -EINVAL;
+
+	rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled);
+	if (rc)
+		return rc;
+
+	return sysfs_emit(buf, "%d\n", enabled);
+}
+
+static ssize_t sas_ncq_prio_enable_store(struct device *device,
+					 struct device_attribute *attr,
+					 const char *buf, size_t len)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct domain_device *ddev = sdev_to_domain_dev(sdev);
+	bool enable;
+	int rc;
+
+	/* This attribute shall be visible for SATA devices only */
+	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
+		return -EINVAL;
+
+	rc = kstrtobool(buf, &enable);
+	if (rc)
+		return rc;
+
+	rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
+	if (rc)
+		return rc;
+
+	return len;
+}
+
+DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
+	    sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
+
+static struct attribute *sas_ata_sdev_attrs[] = {
+	&dev_attr_ncq_prio_supported.attr,
+	&dev_attr_ncq_prio_enable.attr,
+	NULL
+};
+
+static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
+				       struct attribute *attr, int i)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct domain_device *ddev = sdev_to_domain_dev(sdev);
+
+	if (!dev_is_sata(ddev))
+		return 0;
+
+	return attr->mode;
+}
+
+const struct attribute_group sas_ata_sdev_attr_group = {
+	.attrs = sas_ata_sdev_attrs,
+	.is_visible = sas_ata_attr_is_visible,
+};
+EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);
diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
index 2f8c719840a6..59a75cd8b5e0 100644
--- a/include/scsi/sas_ata.h
+++ b/include/scsi/sas_ata.h
@@ -39,6 +39,8 @@ int smp_ata_check_ready_type(struct ata_link *link);
 int sas_discover_sata(struct domain_device *dev);
 int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
 		    struct domain_device *child, int phy_id);
+
+extern const struct attribute_group sas_ata_sdev_attr_group;
 #else
 
 static inline void sas_ata_disabled_notice(void)
@@ -123,6 +125,10 @@ static inline int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *p
 	sas_ata_disabled_notice();
 	return -ENODEV;
 }
+
+static const struct attribute_group sas_ata_sdev_attr_group __maybe_unused = {
+	.attrs = NULL,
+};
 #endif
 
 #endif /* _SAS_ATA_H_ */
-- 
2.44.0.278.ge034bb2e1d-goog
Re: [PATCH v6 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for SATA devices
Posted by Hannes Reinecke 1 year, 9 months ago 
On 3/6/24 00:58, Igor Pylypiv 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@oracle.com>
> Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
> Reviewed-by: Jason Yan <yanaijie@huawei.com>
> Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
> ---
>   drivers/scsi/libsas/sas_ata.c | 94 +++++++++++++++++++++++++++++++++++
>   include/scsi/sas_ata.h        |  6 +++
>   2 files changed, 100 insertions(+)
> 
> diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
> index 12e2653846e3..04b0bd9a4e01 100644
> --- a/drivers/scsi/libsas/sas_ata.c
> +++ b/drivers/scsi/libsas/sas_ata.c
> @@ -964,3 +964,97 @@ int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
>   			       force_phy_id, &tmf_task);
>   }
>   EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
> +
> +static ssize_t sas_ncq_prio_supported_show(struct device *device,
> +					   struct device_attribute *attr,
> +					   char *buf)
> +{
> +	struct scsi_device *sdev = to_scsi_device(device);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool supported;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +
You don't need the WARN_ON here; the 'is_visible' function will take
care of it.

> +	rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported);
> +	if (rc)
> +		return rc;
> +
> +	return sysfs_emit(buf, "%d\n", supported);
> +}
> +
> +DEVICE_ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
> +
> +static ssize_t sas_ncq_prio_enable_show(struct device *device,
> +					struct device_attribute *attr,
> +					char *buf)
> +{
> +	struct scsi_device *sdev = to_scsi_device(device);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool enabled;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +

Same here.

> +	rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled);
> +	if (rc)
> +		return rc;
> +
> +	return sysfs_emit(buf, "%d\n", enabled);
> +}
> +
> +static ssize_t sas_ncq_prio_enable_store(struct device *device,
> +					 struct device_attribute *attr,
> +					 const char *buf, size_t len)
> +{
> +	struct scsi_device *sdev = to_scsi_device(device);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool enable;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +

And here.

> +	rc = kstrtobool(buf, &enable);
> +	if (rc)
> +		return rc;
> +
> +	rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
> +	if (rc)
> +		return rc;
> +
> +	return len;
> +}
> +
> +DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
> +	    sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
> +
> +static struct attribute *sas_ata_sdev_attrs[] = {
> +	&dev_attr_ncq_prio_supported.attr,
> +	&dev_attr_ncq_prio_enable.attr,
> +	NULL
> +};
> +
> +static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
> +				       struct attribute *attr, int i)
> +{
> +	struct device *dev = kobj_to_dev(kobj);
> +	struct scsi_device *sdev = to_scsi_device(dev);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +
> +	if (!dev_is_sata(ddev))
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
> +const struct attribute_group sas_ata_sdev_attr_group = {
> +	.attrs = sas_ata_sdev_attrs,
> +	.is_visible = sas_ata_attr_is_visible,
> +};
> +EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);
> diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
> index 2f8c719840a6..59a75cd8b5e0 100644
> --- a/include/scsi/sas_ata.h
> +++ b/include/scsi/sas_ata.h
> @@ -39,6 +39,8 @@ int smp_ata_check_ready_type(struct ata_link *link);
>   int sas_discover_sata(struct domain_device *dev);
>   int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
>   		    struct domain_device *child, int phy_id);
> +
> +extern const struct attribute_group sas_ata_sdev_attr_group;
>   #else
>   
>   static inline void sas_ata_disabled_notice(void)
> @@ -123,6 +125,10 @@ static inline int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *p
>   	sas_ata_disabled_notice();
>   	return -ENODEV;
>   }
> +
> +static const struct attribute_group sas_ata_sdev_attr_group __maybe_unused = {
> +	.attrs = NULL,
> +};
>   #endif
>   
>   #endif /* _SAS_ATA_H_ */

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich
Re: [PATCH v6 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for SATA devices
Posted by Damien Le Moal 1 year, 9 months ago 
On 3/6/24 08:58, Igor Pylypiv 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@oracle.com>
> Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
> Reviewed-by: Jason Yan <yanaijie@huawei.com>
> Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
> ---
>  drivers/scsi/libsas/sas_ata.c | 94 +++++++++++++++++++++++++++++++++++
>  include/scsi/sas_ata.h        |  6 +++
>  2 files changed, 100 insertions(+)
> 
> diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
> index 12e2653846e3..04b0bd9a4e01 100644
> --- a/drivers/scsi/libsas/sas_ata.c
> +++ b/drivers/scsi/libsas/sas_ata.c
> @@ -964,3 +964,97 @@ int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
>  			       force_phy_id, &tmf_task);
>  }
>  EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
> +
> +static ssize_t sas_ncq_prio_supported_show(struct device *device,
> +					   struct device_attribute *attr,
> +					   char *buf)
> +{
> +	struct scsi_device *sdev = to_scsi_device(device);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool supported;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +
> +	rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported);
> +	if (rc)
> +		return rc;
> +
> +	return sysfs_emit(buf, "%d\n", supported);
> +}
> +
> +DEVICE_ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
> +
> +static ssize_t sas_ncq_prio_enable_show(struct device *device,
> +					struct device_attribute *attr,
> +					char *buf)
> +{
> +	struct scsi_device *sdev = to_scsi_device(device);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool enabled;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +
> +	rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled);
> +	if (rc)
> +		return rc;
> +
> +	return sysfs_emit(buf, "%d\n", enabled);
> +}
> +
> +static ssize_t sas_ncq_prio_enable_store(struct device *device,
> +					 struct device_attribute *attr,
> +					 const char *buf, size_t len)
> +{
> +	struct scsi_device *sdev = to_scsi_device(device);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +	bool enable;
> +	int rc;
> +
> +	/* This attribute shall be visible for SATA devices only */
> +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> +		return -EINVAL;
> +
> +	rc = kstrtobool(buf, &enable);
> +	if (rc)
> +		return rc;
> +
> +	rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
> +	if (rc)
> +		return rc;
> +
> +	return len;
> +}
> +
> +DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
> +	    sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
> +
> +static struct attribute *sas_ata_sdev_attrs[] = {
> +	&dev_attr_ncq_prio_supported.attr,
> +	&dev_attr_ncq_prio_enable.attr,
> +	NULL
> +};
> +
> +static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
> +				       struct attribute *attr, int i)
> +{
> +	struct device *dev = kobj_to_dev(kobj);
> +	struct scsi_device *sdev = to_scsi_device(dev);
> +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> +
> +	if (!dev_is_sata(ddev))
> +		return 0;
> +
> +	return attr->mode;
> +}
> +
> +const struct attribute_group sas_ata_sdev_attr_group = {
> +	.attrs = sas_ata_sdev_attrs,
> +	.is_visible = sas_ata_attr_is_visible,
> +};
> +EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);
> diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
> index 2f8c719840a6..59a75cd8b5e0 100644
> --- a/include/scsi/sas_ata.h
> +++ b/include/scsi/sas_ata.h
> @@ -39,6 +39,8 @@ int smp_ata_check_ready_type(struct ata_link *link);
>  int sas_discover_sata(struct domain_device *dev);
>  int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
>  		    struct domain_device *child, int phy_id);
> +
> +extern const struct attribute_group sas_ata_sdev_attr_group;
>  #else
>  
>  static inline void sas_ata_disabled_notice(void)
> @@ -123,6 +125,10 @@ static inline int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *p
>  	sas_ata_disabled_notice();
>  	return -ENODEV;
>  }
> +
> +static const struct attribute_group sas_ata_sdev_attr_group __maybe_unused = {
> +	.attrs = NULL,
> +};

Looks OK, but I must say that I would prefer John's idea with the #define as
that removes the variable definition entirely.

>  #endif
>  
>  #endif /* _SAS_ATA_H_ */

-- 
Damien Le Moal
Western Digital Research
Re: [PATCH v6 2/7] scsi: libsas: Define NCQ Priority sysfs attributes for SATA devices
Posted by Igor Pylypiv 1 year, 9 months ago 
On Wed, Mar 06, 2024 at 09:01:41AM +0900, Damien Le Moal wrote:
> On 3/6/24 08:58, Igor Pylypiv 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@oracle.com>
> > Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
> > Reviewed-by: Jason Yan <yanaijie@huawei.com>
> > Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
> > ---
> >  drivers/scsi/libsas/sas_ata.c | 94 +++++++++++++++++++++++++++++++++++
> >  include/scsi/sas_ata.h        |  6 +++
> >  2 files changed, 100 insertions(+)
> > 
> > diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
> > index 12e2653846e3..04b0bd9a4e01 100644
> > --- a/drivers/scsi/libsas/sas_ata.c
> > +++ b/drivers/scsi/libsas/sas_ata.c
> > @@ -964,3 +964,97 @@ int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
> >  			       force_phy_id, &tmf_task);
> >  }
> >  EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
> > +
> > +static ssize_t sas_ncq_prio_supported_show(struct device *device,
> > +					   struct device_attribute *attr,
> > +					   char *buf)
> > +{
> > +	struct scsi_device *sdev = to_scsi_device(device);
> > +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> > +	bool supported;
> > +	int rc;
> > +
> > +	/* This attribute shall be visible for SATA devices only */
> > +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> > +		return -EINVAL;
> > +
> > +	rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported);
> > +	if (rc)
> > +		return rc;
> > +
> > +	return sysfs_emit(buf, "%d\n", supported);
> > +}
> > +
> > +DEVICE_ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
> > +
> > +static ssize_t sas_ncq_prio_enable_show(struct device *device,
> > +					struct device_attribute *attr,
> > +					char *buf)
> > +{
> > +	struct scsi_device *sdev = to_scsi_device(device);
> > +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> > +	bool enabled;
> > +	int rc;
> > +
> > +	/* This attribute shall be visible for SATA devices only */
> > +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> > +		return -EINVAL;
> > +
> > +	rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled);
> > +	if (rc)
> > +		return rc;
> > +
> > +	return sysfs_emit(buf, "%d\n", enabled);
> > +}
> > +
> > +static ssize_t sas_ncq_prio_enable_store(struct device *device,
> > +					 struct device_attribute *attr,
> > +					 const char *buf, size_t len)
> > +{
> > +	struct scsi_device *sdev = to_scsi_device(device);
> > +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> > +	bool enable;
> > +	int rc;
> > +
> > +	/* This attribute shall be visible for SATA devices only */
> > +	if (WARN_ON_ONCE(!dev_is_sata(ddev)))
> > +		return -EINVAL;
> > +
> > +	rc = kstrtobool(buf, &enable);
> > +	if (rc)
> > +		return rc;
> > +
> > +	rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
> > +	if (rc)
> > +		return rc;
> > +
> > +	return len;
> > +}
> > +
> > +DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
> > +	    sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
> > +
> > +static struct attribute *sas_ata_sdev_attrs[] = {
> > +	&dev_attr_ncq_prio_supported.attr,
> > +	&dev_attr_ncq_prio_enable.attr,
> > +	NULL
> > +};
> > +
> > +static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
> > +				       struct attribute *attr, int i)
> > +{
> > +	struct device *dev = kobj_to_dev(kobj);
> > +	struct scsi_device *sdev = to_scsi_device(dev);
> > +	struct domain_device *ddev = sdev_to_domain_dev(sdev);
> > +
> > +	if (!dev_is_sata(ddev))
> > +		return 0;
> > +
> > +	return attr->mode;
> > +}
> > +
> > +const struct attribute_group sas_ata_sdev_attr_group = {
> > +	.attrs = sas_ata_sdev_attrs,
> > +	.is_visible = sas_ata_attr_is_visible,
> > +};
> > +EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);
> > diff --git a/include/scsi/sas_ata.h b/include/scsi/sas_ata.h
> > index 2f8c719840a6..59a75cd8b5e0 100644
> > --- a/include/scsi/sas_ata.h
> > +++ b/include/scsi/sas_ata.h
> > @@ -39,6 +39,8 @@ int smp_ata_check_ready_type(struct ata_link *link);
> >  int sas_discover_sata(struct domain_device *dev);
> >  int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
> >  		    struct domain_device *child, int phy_id);
> > +
> > +extern const struct attribute_group sas_ata_sdev_attr_group;
> >  #else
> >  
> >  static inline void sas_ata_disabled_notice(void)
> > @@ -123,6 +125,10 @@ static inline int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *p
> >  	sas_ata_disabled_notice();
> >  	return -ENODEV;
> >  }
> > +
> > +static const struct attribute_group sas_ata_sdev_attr_group __maybe_unused = {
> > +	.attrs = NULL,
> > +};
> 
> Looks OK, but I must say that I would prefer John's idea with the #define as
> that removes the variable definition entirely.

I'm fine with chaning the code to use #define.

My only concern is that C++ compilers complain about taking address of rvalue.
Looks like this is not an issue for C compilers.

I'll send v7 with the #define approach shortly.

> 
> >  #endif
> >  
> >  #endif /* _SAS_ATA_H_ */
> 
> -- 
> Damien Le Moal
> Western Digital Research
>

Patchew 2.1-devel-b67e4c2

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