hi gouhao:

这个补丁由于新增结构体成员变量，会引入kabi告警，需要考虑其他的修复方法消除告警。

best regard

>>>>>>>>>>>>>>>>>>>>>>>>>> [WARNING] checkkabi_hulk <<<<<<<<<<<<<<<<<<<<<<<<<<

scripts/check-kabi -k kabi/current/Module-kabi.arm64 -s Module.symvers.16b1727fa74d

*** ERROR - ABI BREAKAGE WAS DETECTED ***

The following symbols have been changed (this will cause an ABI breakage):

On 2021/9/18 11:11, Gou Hao wrote:
> From: Andrzej Pietrasiewicz<andrzej.p@collabora.com>
>
> mainline inclusion
> from mainline-v5.14.0-rc7
> commit e1a29c6c59553d80a8e17d63494c65a13fb8e241
> category: bugfix
> bugzilla:https://gitee.com/openeuler/kernel/issues/I469VQ
> CVE: NA
>
> --------------------------------
>
> Add generic code which creates symbolic links in sysfs, pointing to ddc
> interface used by a particular video output. For example:
>
> ls -l /sys/class/drm/card0-HDMI-A-1/ddc
> lrwxrwxrwx 1 root root 0 Jun 24 10:42 /sys/class/drm/card0-HDMI-A-1/ddc \
> 	-> ../../../../soc/13880000.i2c/i2c-2
>
> This makes it easy for user to associate a display with its ddc adapter
> and use e.g. ddcutil to control the chosen monitor.
>
> This patch adds an i2c_adapter pointer to struct drm_connector. Particular
> drivers can then use it instead of using their own private instance. If a
> connector contains a ddc, then create a symbolic link in sysfs.
>
> Signed-off-by: Andrzej Pietrasiewicz<andrzej.p@collabora.com>
> Acked-by: Daniel Vetter<daniel.vetter@ffwll.ch>
> Reviewed-by: Andrzej Hajda<a.hajda@samsung.com>
> Reviewed-by: Emil Velikov<emil.velikov@collabora.com>
> Reviewed-by: Sam Ravnborg<sam@ravnborg.org>
> Signed-off-by: Neil Armstrong<narmstrong@baylibre.com>
> Link:https://patchwork.freedesktop.org/patch/msgid/d470def6cd661b777faeee67b5838a4623c4010e.1564161140.git.andrzej.p@collabora.com
>
> Signed-off-by: gouhao<gouhao@uniontech.com>
> ---
>   drivers/gpu/drm/drm_sysfs.c |  8 ++++++++
>   include/drm/drm_connector.h | 11 +++++++++++
>   2 files changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> index ecb7b3300..52879b001 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -15,6 +15,7 @@
>   #include <linux/device.h>
>   #include <linux/kdev_t.h>
>   #include <linux/gfp.h>
> +#include <linux/i2c.h>
>   #include <linux/err.h>
>   #include <linux/export.h>
>   
> @@ -287,6 +288,9 @@ int drm_sysfs_connector_add(struct drm_connector *connector)
>   	/* Let userspace know we have a new connector */
>   	drm_sysfs_hotplug_event(dev);
>   
> +	if (connector->ddc)
> +		return sysfs_create_link(&connector->kdev->kobj,
> +				 &connector->ddc->dev.kobj, "ddc");
>   	return 0;
>   }
>   
> @@ -294,6 +298,10 @@ void drm_sysfs_connector_remove(struct drm_connector *connector)
>   {
>   	if (!connector->kdev)
>   		return;
> +
> +	if (connector->ddc)
> +		sysfs_remove_link(&connector->kdev->kobj, "ddc");
> +
>   	DRM_DEBUG("removing \"%s\" from sysfs\n",
>   		  connector->name);
>   
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 97ea41dc6..d8f4e66fb 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -40,6 +40,7 @@ struct drm_property;
>   struct drm_property_blob;
>   struct drm_printer;
>   struct edid;
> +struct i2c_adapter;
>   
>   enum drm_connector_force {
>   	DRM_FORCE_UNSPECIFIED,
> @@ -998,6 +999,16 @@ struct drm_connector {
>   	 * [0]: progressive, [1]: interlaced
>   	 */
>   	int audio_latency[2];
> +
> +	/**
> +	 * @ddc: associated ddc adapter.
> +	 * A connector usually has its associated ddc adapter. If a driver uses
> +	 * this field, then an appropriate symbolic link is created in connector
> +	 * sysfs directory to make it easy for the user to tell which i2c
> +	 * adapter is for a particular display.
> +	 */
> +	struct i2c_adapter *ddc;
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^<-新增成员
> +
>   	/**
>   	 * @null_edid_counter: track sinks that give us all zeros for the EDID.
>   	 * Needed to workaround some HW bugs where we get all 0s