xref: /OK3568_Linux_fs/kernel/drivers/block/null_blk_trace.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  * null_blk trace related helpers.
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * Copyright (C) 2020 Western Digital Corporation or its affiliates.
6*4882a593Smuzhiyun  */
7*4882a593Smuzhiyun #include "null_blk_trace.h"
8*4882a593Smuzhiyun 
9*4882a593Smuzhiyun /*
10*4882a593Smuzhiyun  * Helper to use for all null_blk traces to extract disk name.
11*4882a593Smuzhiyun  */
nullb_trace_disk_name(struct trace_seq * p,char * name)12*4882a593Smuzhiyun const char *nullb_trace_disk_name(struct trace_seq *p, char *name)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun 	const char *ret = trace_seq_buffer_ptr(p);
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun 	if (name && *name)
17*4882a593Smuzhiyun 		trace_seq_printf(p, "disk=%s, ", name);
18*4882a593Smuzhiyun 	trace_seq_putc(p, 0);
19*4882a593Smuzhiyun 
20*4882a593Smuzhiyun 	return ret;
21*4882a593Smuzhiyun }
22