fix the issue of incorrect device id in diskerrors.

[answer9030]

The device ID of a block event is organized in kernel space, and the device ID obtained by user space processes is also organized in kernel space. Therefore, it needs to be parsed in kernel mode. Kernel Space Definition：

TRACE_EVENT(block_rq_complete,

	TP_PROTO(struct request *rq, int error, unsigned int nr_bytes),

	TP_ARGS(rq, error, nr_bytes),

	TP_STRUCT__entry(
		__field(  dev_t,	dev			)
		__field(  sector_t,	sector			)
		__field(  unsigned int,	nr_sector		)
		__field(  int,		error			)
		__array(  char,		rwbs,	RWBS_LEN	)
		__dynamic_array( char,	cmd,	1		)
	),

	TP_fast_assign(
		__entry->dev	   = rq->rq_disk ? disk_devt(rq->rq_disk) : 0;
		__entry->sector    = blk_rq_pos(rq);
		__entry->nr_sector = nr_bytes >> 9;
		__entry->error     = error;

		blk_fill_rwbs(__entry->rwbs, rq->cmd_flags, nr_bytes);
		__get_str(cmd)[0] = '\0';
	),

	TP_printk("%d,%d %s (%s) %llu + %u [%d]",
		  MAJOR(__entry->dev), MINOR(__entry->dev),
		  __entry->rwbs, __get_str(cmd),
		  (unsigned long long)__entry->sector,
		  __entry->nr_sector, __entry->error)
);

[mchehab]

The changes you're proposing seem incomplete, as you just defined two new macros but the logic is not using it. Did you forget to push some other changes?

Also, please add your Signed-off-by to the patch (see https://wiki.linuxfoundation.org/dco) and provide a clear description to it.