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[SCSI] add scsi trace core functions and put trace points

Browse Source 
Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
Signed-off-by: Kei Tokunaga <tokunaga.keiich@jp.fujitsu.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Kei Tokunaga 2010-04-01 20:41:40 +09:00 committed by James Bottomley
parent 5a2e399595
commit bf81623542
6 changed files with 525 additions and 0 deletions
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1
drivers/scsi/Makefile
View File

@ -162,6 +162,7 @@ scsi_mod-y += scsi_scan.o scsi_sysfs.o scsi_devinfo.o
scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o
scsi_mod-$(CONFIG_SYSCTL) += scsi_sysctl.o
scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o
scsi_mod-y += scsi_trace.o
scsi_tgt-y += scsi_tgt_lib.o scsi_tgt_if.o

6
drivers/scsi/scsi.c
View File

@ -67,6 +67,9 @@
#include "scsi_priv.h"
#include "scsi_logging.h"
#define CREATE_TRACE_POINTS
#include <trace/events/scsi.h>
static void scsi_done(struct scsi_cmnd *cmd);
/*
@ -747,10 +750,12 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
cmd->result = (DID_NO_CONNECT << 16);
scsi_done(cmd);
} else {
trace_scsi_dispatch_cmd_start(cmd);
rtn = host->hostt->queuecommand(cmd, scsi_done);
}
spin_unlock_irqrestore(host->host_lock, flags);
if (rtn) {
trace_scsi_dispatch_cmd_error(cmd, rtn);
if (rtn != SCSI_MLQUEUE_DEVICE_BUSY &&
rtn != SCSI_MLQUEUE_TARGET_BUSY)
rtn = SCSI_MLQUEUE_HOST_BUSY;
@ -781,6 +786,7 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
*/
static void scsi_done(struct scsi_cmnd *cmd)
{
trace_scsi_dispatch_cmd_done(cmd);
blk_complete_request(cmd->request);
}

4
drivers/scsi/scsi_error.c
View File

@ -39,6 +39,8 @@
#include "scsi_logging.h"
#include "scsi_transport_api.h"
#include <trace/events/scsi.h>
#define SENSE_TIMEOUT (10*HZ)
/*
@ -52,6 +54,7 @@
void scsi_eh_wakeup(struct Scsi_Host *shost)
{
if (shost->host_busy == shost->host_failed) {
trace_scsi_eh_wakeup(shost);
wake_up_process(shost->ehandler);
SCSI_LOG_ERROR_RECOVERY(5,
printk("Waking error handler thread\n"));
@ -127,6 +130,7 @@ enum blk_eh_timer_return scsi_times_out(struct request *req)
struct scsi_cmnd *scmd = req->special;
enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED;
trace_scsi_dispatch_cmd_timeout(scmd);
scsi_log_completion(scmd, TIMEOUT_ERROR);
if (scmd->device->host->transportt->eh_timed_out)

185
drivers/scsi/scsi_trace.c Normal file
View File

@ -0,0 +1,185 @@
/*
* Copyright (C) 2010 FUJITSU LIMITED
* Copyright (C) 2010 Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/kernel.h>
#include <linux/trace_seq.h>
#include <trace/events/scsi.h>
#define SERVICE_ACTION(cdb) ((cdb[8] << 8) | cdb[9])
static const char *
scsi_trace_misc(struct trace_seq *, unsigned char *, int);
static const char *
scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
sector_t lba = 0, txlen = 0;
lba |= ((cdb[1] & 0x1F) << 16);
lba |= (cdb[2] << 8);
lba |= cdb[3];
txlen = cdb[4];
trace_seq_printf(p, "lba=%llu txlen=%llu",
(unsigned long long)lba, (unsigned long long)txlen);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw10(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
sector_t lba = 0, txlen = 0;
lba |= (cdb[2] << 24);
lba |= (cdb[3] << 16);
lba |= (cdb[4] << 8);
lba |= cdb[5];
txlen |= (cdb[7] << 8);
txlen |= cdb[8];
trace_seq_printf(p, "lba=%llu txlen=%llu",
(unsigned long long)lba, (unsigned long long)txlen);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
sector_t lba = 0, txlen = 0;
lba |= (cdb[2] << 24);
lba |= (cdb[3] << 16);
lba |= (cdb[4] << 8);
lba |= cdb[5];
txlen |= (cdb[6] << 24);
txlen |= (cdb[7] << 16);
txlen |= (cdb[8] << 8);
txlen |= cdb[9];
trace_seq_printf(p, "lba=%llu txlen=%llu",
(unsigned long long)lba, (unsigned long long)txlen);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
sector_t lba = 0, txlen = 0;
lba |= ((u64)cdb[2] << 56);
lba |= ((u64)cdb[3] << 48);
lba |= ((u64)cdb[4] << 40);
lba |= ((u64)cdb[5] << 32);
lba |= (cdb[6] << 24);
lba |= (cdb[7] << 16);
lba |= (cdb[8] << 8);
lba |= cdb[9];
txlen |= (cdb[10] << 24);
txlen |= (cdb[11] << 16);
txlen |= (cdb[12] << 8);
txlen |= cdb[13];
trace_seq_printf(p, "lba=%llu txlen=%llu",
(unsigned long long)lba, (unsigned long long)txlen);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
sector_t lba = 0, txlen = 0;
lba |= ((u64)cdb[12] << 56);
lba |= ((u64)cdb[13] << 48);
lba |= ((u64)cdb[14] << 40);
lba |= ((u64)cdb[15] << 32);
lba |= (cdb[16] << 24);
lba |= (cdb[17] << 16);
lba |= (cdb[18] << 8);
lba |= cdb[19];
txlen |= (cdb[28] << 24);
txlen |= (cdb[29] << 16);
txlen |= (cdb[30] << 8);
txlen |= cdb[31];
trace_seq_printf(p, "%s_32 lba=%llu txlen=%llu",
(SERVICE_ACTION(cdb) == READ_32 ? "READ" : "WRITE"),
(unsigned long long)lba, (unsigned long long)txlen);
trace_seq_putc(p, 0);
return ret;
}
static const char *
scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
{
switch (SERVICE_ACTION(cdb)) {
case READ_32:
case WRITE_32:
return scsi_trace_rw32(p, cdb, len);
default:
return scsi_trace_misc(p, cdb, len);
}
}
static const char *
scsi_trace_misc(struct trace_seq *p, unsigned char *cdb, int len)
{
const char *ret = p->buffer + p->len;
trace_seq_printf(p, "-");
trace_seq_putc(p, 0);
return ret;
}
const char *
scsi_trace_parse_cdb(struct trace_seq *p, unsigned char *cdb, int len)
{
switch (cdb[0]) {
case READ_6:
case WRITE_6:
return scsi_trace_rw6(p, cdb, len);
case READ_10:
case WRITE_10:
return scsi_trace_rw10(p, cdb, len);
case READ_12:
case WRITE_12:
return scsi_trace_rw12(p, cdb, len);
case READ_16:
case WRITE_16:
return scsi_trace_rw16(p, cdb, len);
case VARIABLE_LENGTH_CMD:
return scsi_trace_varlen(p, cdb, len);
default:
return scsi_trace_misc(p, cdb, len);
}
}

328
include/trace/events/scsi.h Normal file
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@ -0,0 +1,328 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM scsi
#if !defined(_TRACE_SCSI_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_SCSI_H
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <linux/tracepoint.h>
#include <linux/trace_seq.h>
#define scsi_opcode_name(opcode) { opcode, #opcode }
#define show_opcode_name(val) \
__print_symbolic(val, \
scsi_opcode_name(TEST_UNIT_READY), \
scsi_opcode_name(REZERO_UNIT), \
scsi_opcode_name(REQUEST_SENSE), \
scsi_opcode_name(FORMAT_UNIT), \
scsi_opcode_name(READ_BLOCK_LIMITS), \
scsi_opcode_name(REASSIGN_BLOCKS), \
scsi_opcode_name(INITIALIZE_ELEMENT_STATUS), \
scsi_opcode_name(READ_6), \
scsi_opcode_name(WRITE_6), \
scsi_opcode_name(SEEK_6), \
scsi_opcode_name(READ_REVERSE), \
scsi_opcode_name(WRITE_FILEMARKS), \
scsi_opcode_name(SPACE), \
scsi_opcode_name(INQUIRY), \
scsi_opcode_name(RECOVER_BUFFERED_DATA), \
scsi_opcode_name(MODE_SELECT), \
scsi_opcode_name(RESERVE), \
scsi_opcode_name(RELEASE), \
scsi_opcode_name(COPY), \
scsi_opcode_name(ERASE), \
scsi_opcode_name(MODE_SENSE), \
scsi_opcode_name(START_STOP), \
scsi_opcode_name(RECEIVE_DIAGNOSTIC), \
scsi_opcode_name(SEND_DIAGNOSTIC), \
scsi_opcode_name(ALLOW_MEDIUM_REMOVAL), \
scsi_opcode_name(SET_WINDOW), \
scsi_opcode_name(READ_CAPACITY), \
scsi_opcode_name(READ_10), \
scsi_opcode_name(WRITE_10), \
scsi_opcode_name(SEEK_10), \
scsi_opcode_name(POSITION_TO_ELEMENT), \
scsi_opcode_name(WRITE_VERIFY), \
scsi_opcode_name(VERIFY), \
scsi_opcode_name(SEARCH_HIGH), \
scsi_opcode_name(SEARCH_EQUAL), \
scsi_opcode_name(SEARCH_LOW), \
scsi_opcode_name(SET_LIMITS), \
scsi_opcode_name(PRE_FETCH), \
scsi_opcode_name(READ_POSITION), \
scsi_opcode_name(SYNCHRONIZE_CACHE), \
scsi_opcode_name(LOCK_UNLOCK_CACHE), \
scsi_opcode_name(READ_DEFECT_DATA), \
scsi_opcode_name(MEDIUM_SCAN), \
scsi_opcode_name(COMPARE), \
scsi_opcode_name(COPY_VERIFY), \
scsi_opcode_name(WRITE_BUFFER), \
scsi_opcode_name(READ_BUFFER), \
scsi_opcode_name(UPDATE_BLOCK), \
scsi_opcode_name(READ_LONG), \
scsi_opcode_name(WRITE_LONG), \
scsi_opcode_name(CHANGE_DEFINITION), \
scsi_opcode_name(WRITE_SAME), \
scsi_opcode_name(UNMAP), \
scsi_opcode_name(READ_TOC), \
scsi_opcode_name(LOG_SELECT), \
scsi_opcode_name(LOG_SENSE), \
scsi_opcode_name(XDWRITEREAD_10), \
scsi_opcode_name(MODE_SELECT_10), \
scsi_opcode_name(RESERVE_10), \
scsi_opcode_name(RELEASE_10), \
scsi_opcode_name(MODE_SENSE_10), \
scsi_opcode_name(PERSISTENT_RESERVE_IN), \
scsi_opcode_name(PERSISTENT_RESERVE_OUT), \
scsi_opcode_name(VARIABLE_LENGTH_CMD), \
scsi_opcode_name(REPORT_LUNS), \
scsi_opcode_name(MAINTENANCE_IN), \
scsi_opcode_name(MAINTENANCE_OUT), \
scsi_opcode_name(MOVE_MEDIUM), \
scsi_opcode_name(EXCHANGE_MEDIUM), \
scsi_opcode_name(READ_12), \
scsi_opcode_name(WRITE_12), \
scsi_opcode_name(WRITE_VERIFY_12), \
scsi_opcode_name(SEARCH_HIGH_12), \
scsi_opcode_name(SEARCH_EQUAL_12), \
scsi_opcode_name(SEARCH_LOW_12), \
scsi_opcode_name(READ_ELEMENT_STATUS), \
scsi_opcode_name(SEND_VOLUME_TAG), \
scsi_opcode_name(WRITE_LONG_2), \
scsi_opcode_name(READ_16), \
scsi_opcode_name(WRITE_16), \
scsi_opcode_name(VERIFY_16), \
scsi_opcode_name(WRITE_SAME_16), \
scsi_opcode_name(SERVICE_ACTION_IN), \
scsi_opcode_name(SAI_READ_CAPACITY_16), \
scsi_opcode_name(SAI_GET_LBA_STATUS), \
scsi_opcode_name(MI_REPORT_TARGET_PGS), \
scsi_opcode_name(MO_SET_TARGET_PGS), \
scsi_opcode_name(READ_32), \
scsi_opcode_name(WRITE_32), \
scsi_opcode_name(WRITE_SAME_32), \
scsi_opcode_name(ATA_16), \
scsi_opcode_name(ATA_12))
#define scsi_hostbyte_name(result) { result, #result }
#define show_hostbyte_name(val) \
__print_symbolic(val, \
scsi_hostbyte_name(DID_OK), \
scsi_hostbyte_name(DID_NO_CONNECT), \
scsi_hostbyte_name(DID_BUS_BUSY), \
scsi_hostbyte_name(DID_TIME_OUT), \
scsi_hostbyte_name(DID_BAD_TARGET), \
scsi_hostbyte_name(DID_ABORT), \
scsi_hostbyte_name(DID_PARITY), \
scsi_hostbyte_name(DID_ERROR), \
scsi_hostbyte_name(DID_RESET), \
scsi_hostbyte_name(DID_BAD_INTR), \
scsi_hostbyte_name(DID_PASSTHROUGH), \
scsi_hostbyte_name(DID_SOFT_ERROR), \
scsi_hostbyte_name(DID_IMM_RETRY), \
scsi_hostbyte_name(DID_REQUEUE), \
scsi_hostbyte_name(DID_TRANSPORT_DISRUPTED), \
scsi_hostbyte_name(DID_TRANSPORT_FAILFAST))
#define scsi_driverbyte_name(result) { result, #result }
#define show_driverbyte_name(val) \
__print_symbolic(val, \
scsi_driverbyte_name(DRIVER_OK), \
scsi_driverbyte_name(DRIVER_BUSY), \
scsi_driverbyte_name(DRIVER_SOFT), \
scsi_driverbyte_name(DRIVER_MEDIA), \
scsi_driverbyte_name(DRIVER_ERROR), \
scsi_driverbyte_name(DRIVER_INVALID), \
scsi_driverbyte_name(DRIVER_TIMEOUT), \
scsi_driverbyte_name(DRIVER_HARD), \
scsi_driverbyte_name(DRIVER_SENSE))
#define scsi_msgbyte_name(result) { result, #result }
#define show_msgbyte_name(val) \
__print_symbolic(val, \
scsi_msgbyte_name(COMMAND_COMPLETE), \
scsi_msgbyte_name(EXTENDED_MESSAGE), \
scsi_msgbyte_name(SAVE_POINTERS), \
scsi_msgbyte_name(RESTORE_POINTERS), \
scsi_msgbyte_name(DISCONNECT), \
scsi_msgbyte_name(INITIATOR_ERROR), \
scsi_msgbyte_name(ABORT_TASK_SET), \
scsi_msgbyte_name(MESSAGE_REJECT), \
scsi_msgbyte_name(NOP), \
scsi_msgbyte_name(MSG_PARITY_ERROR), \
scsi_msgbyte_name(LINKED_CMD_COMPLETE), \
scsi_msgbyte_name(LINKED_FLG_CMD_COMPLETE), \
scsi_msgbyte_name(TARGET_RESET), \
scsi_msgbyte_name(ABORT_TASK), \
scsi_msgbyte_name(CLEAR_TASK_SET), \
scsi_msgbyte_name(INITIATE_RECOVERY), \
scsi_msgbyte_name(RELEASE_RECOVERY), \
scsi_msgbyte_name(CLEAR_ACA), \
scsi_msgbyte_name(LOGICAL_UNIT_RESET), \
scsi_msgbyte_name(SIMPLE_QUEUE_TAG), \
scsi_msgbyte_name(HEAD_OF_QUEUE_TAG), \
scsi_msgbyte_name(ORDERED_QUEUE_TAG), \
scsi_msgbyte_name(IGNORE_WIDE_RESIDUE), \
scsi_msgbyte_name(ACA), \
scsi_msgbyte_name(QAS_REQUEST), \
scsi_msgbyte_name(BUS_DEVICE_RESET), \
scsi_msgbyte_name(ABORT))
#define scsi_statusbyte_name(result) { result, #result }
#define show_statusbyte_name(val) \
__print_symbolic(val, \
scsi_statusbyte_name(SAM_STAT_GOOD), \
scsi_statusbyte_name(SAM_STAT_CHECK_CONDITION), \
scsi_statusbyte_name(SAM_STAT_CONDITION_MET), \
scsi_statusbyte_name(SAM_STAT_BUSY), \
scsi_statusbyte_name(SAM_STAT_INTERMEDIATE), \
scsi_statusbyte_name(SAM_STAT_INTERMEDIATE_CONDITION_MET), \
scsi_statusbyte_name(SAM_STAT_RESERVATION_CONFLICT), \
scsi_statusbyte_name(SAM_STAT_COMMAND_TERMINATED), \
scsi_statusbyte_name(SAM_STAT_TASK_SET_FULL), \
scsi_statusbyte_name(SAM_STAT_ACA_ACTIVE), \
scsi_statusbyte_name(SAM_STAT_TASK_ABORTED))
const char *scsi_trace_parse_cdb(struct trace_seq*, unsigned char*, int);
#define __parse_cdb(cdb, len) scsi_trace_parse_cdb(p, cdb, len)
TRACE_EVENT(scsi_dispatch_cmd_start,
TP_PROTO(struct scsi_cmnd *cmd),
TP_ARGS(cmd),
TP_STRUCT__entry(
__field( unsigned int, host_no )
__field( unsigned int, channel )
__field( unsigned int, id )
__field( unsigned int, lun )
__field( unsigned int, opcode )
__field( unsigned int, cmd_len )
__dynamic_array(unsigned char, cmnd, cmd->cmd_len)
),
TP_fast_assign(
__entry->host_no = cmd->device->host->host_no;
__entry->channel = cmd->device->channel;
__entry->id = cmd->device->id;
__entry->lun = cmd->device->lun;
__entry->opcode = cmd->cmnd[0];
__entry->cmd_len = cmd->cmd_len;
memcpy(__get_dynamic_array(cmnd), cmd->cmnd, cmd->cmd_len);
),
TP_printk("host_no=%u channel=%u id=%u lun=%u cmnd=(%s %s raw=%s)",
__entry->host_no, __entry->channel, __entry->id,
__entry->lun, show_opcode_name(__entry->opcode),
__parse_cdb(__get_dynamic_array(cmnd), __entry->cmd_len),
__print_hex(__get_dynamic_array(cmnd), __entry->cmd_len))
);
TRACE_EVENT(scsi_dispatch_cmd_error,
TP_PROTO(struct scsi_cmnd *cmd, int rtn),
TP_ARGS(cmd, rtn),
TP_STRUCT__entry(
__field( unsigned int, host_no )
__field( unsigned int, channel )
__field( unsigned int, id )
__field( unsigned int, lun )
__field( int, rtn )
__field( unsigned int, opcode )
__field( unsigned int, cmd_len )
__dynamic_array(unsigned char, cmnd, cmd->cmd_len)
),
TP_fast_assign(
__entry->host_no = cmd->device->host->host_no;
__entry->channel = cmd->device->channel;
__entry->id = cmd->device->id;
__entry->lun = cmd->device->lun;
__entry->rtn = rtn;
__entry->opcode = cmd->cmnd[0];
__entry->cmd_len = cmd->cmd_len;
memcpy(__get_dynamic_array(cmnd), cmd->cmnd, cmd->cmd_len);
),
TP_printk("host_no=%u channel=%u id=%u lun=%u cmnd=(%s %s raw=%s)"
" rtn=%d",
__entry->host_no, __entry->channel, __entry->id,
__entry->lun, show_opcode_name(__entry->opcode),
__parse_cdb(__get_dynamic_array(cmnd), __entry->cmd_len),
__print_hex(__get_dynamic_array(cmnd), __entry->cmd_len),
__entry->rtn)
);
DECLARE_EVENT_CLASS(scsi_cmd_done_timeout_template,
TP_PROTO(struct scsi_cmnd *cmd),
TP_ARGS(cmd),
TP_STRUCT__entry(
__field( unsigned int, host_no )
__field( unsigned int, channel )
__field( unsigned int, id )
__field( unsigned int, lun )
__field( int, result )
__field( unsigned int, opcode )
__field( unsigned int, cmd_len )
__dynamic_array(unsigned char, cmnd, cmd->cmd_len)
),
TP_fast_assign(
__entry->host_no = cmd->device->host->host_no;
__entry->channel = cmd->device->channel;
__entry->id = cmd->device->id;
__entry->lun = cmd->device->lun;
__entry->result = cmd->result;
__entry->opcode = cmd->cmnd[0];
__entry->cmd_len = cmd->cmd_len;
memcpy(__get_dynamic_array(cmnd), cmd->cmnd, cmd->cmd_len);
),
TP_printk("host_no=%u channel=%u id=%u lun=%u cmnd=(%s %s raw=%s) "
"result=(driver=%s host=%s message=%s status=%s)",
__entry->host_no, __entry->channel, __entry->id,
__entry->lun, show_opcode_name(__entry->opcode),
__parse_cdb(__get_dynamic_array(cmnd), __entry->cmd_len),
__print_hex(__get_dynamic_array(cmnd), __entry->cmd_len),
show_driverbyte_name(((__entry->result) >> 24) & 0xff),
show_hostbyte_name(((__entry->result) >> 16) & 0xff),
show_msgbyte_name(((__entry->result) >> 8) & 0xff),
show_statusbyte_name(__entry->result & 0xff))
);
DEFINE_EVENT(scsi_cmd_done_timeout_template, scsi_dispatch_cmd_done,
TP_PROTO(struct scsi_cmnd *cmd),
TP_ARGS(cmd));
DEFINE_EVENT(scsi_cmd_done_timeout_template, scsi_dispatch_cmd_timeout,
TP_PROTO(struct scsi_cmnd *cmd),
TP_ARGS(cmd));
TRACE_EVENT(scsi_eh_wakeup,
TP_PROTO(struct Scsi_Host *shost),
TP_ARGS(shost),
TP_STRUCT__entry(
__field( unsigned int, host_no )
),
TP_fast_assign(
__entry->host_no = shost->host_no;
),
TP_printk("host_no=%u", __entry->host_no)
);
#endif /* _TRACE_SCSI_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

1
kernel/trace/trace_output.c
View File

@ -209,6 +209,7 @@ int trace_seq_putc(struct trace_seq *s, unsigned char c)
return 1;
}
EXPORT_SYMBOL(trace_seq_putc);
int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
{