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    printk("[" DRM_NAME ":%s] " fmt , __func__ , ##arg)

/**

 * This structure defines the drm_mm memory object, which will be used by the

 * DRM for its buffer objects.

 */

struct drm_gem_object {

    /** Reference count of this object */

//    struct kref refcount;

    /** Handle count of this object. Each handle also holds a reference */

//    struct kref handlecount;

    /** Related drm device */

    struct drm_device *dev;

    /** File representing the shmem storage */

//    struct file *filp;

    /* Mapping info for this object */

//    struct drm_map_list map_list;

    /**

     * Size of the object, in bytes.  Immutable over the object's

     * lifetime.

     */

    size_t size;

    /**

     * Global name for this object, starts at 1. 0 means unnamed.

     * Access is covered by the object_name_lock in the related drm_device

     */

    int name;

    /**

     * Memory domains. These monitor which caches contain read/write data

     * related to the object. When transitioning from one set of domains

     * to another, the driver is called to ensure that caches are suitably

     * flushed and invalidated

     */

    uint32_t read_domains;

    uint32_t write_domain;

    /**

     * While validating an exec operation, the

     * new read/write domain values are computed here.

     * They will be transferred to the above values

     * at the point that any cache flushing occurs

     */

    uint32_t pending_read_domains;

    uint32_t pending_write_domain;

    void *driver_private;

};