locking/atomic, kref: Add kref_read()
Since we need to change the implementation, stop exposing internals.
Provide kref_read() to read the current reference count; typically
used for debug messages.
Kills two anti-patterns:
atomic_read(&kref->refcount)
kref->refcount.counter
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
index a63542b..caa7a7b 100644
--- a/drivers/scsi/lpfc/lpfc_debugfs.c
+++ b/drivers/scsi/lpfc/lpfc_debugfs.c
@@ -607,7 +607,7 @@ lpfc_debugfs_nodelist_data(struct lpfc_vport *vport, char *buf, int size)
len += snprintf(buf+len, size-len, "usgmap:%x ",
ndlp->nlp_usg_map);
len += snprintf(buf+len, size-len, "refcnt:%x",
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
len += snprintf(buf+len, size-len, "\n");
}
spin_unlock_irq(shost->host_lock);
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 236e4e5..7a88295 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -3688,7 +3688,7 @@ lpfc_mbx_cmpl_dflt_rpi(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
lpfc_printf_vlog(ndlp->vport, KERN_INFO, LOG_NODE,
"0006 rpi%x DID:%x flg:%x %d map:%x %p\n",
ndlp->nlp_rpi, ndlp->nlp_DID, ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount),
+ kref_read(&ndlp->kref),
ndlp->nlp_usg_map, ndlp);
if (NLP_CHK_NODE_ACT(ndlp)) {
lpfc_nlp_put(ndlp);
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index ed22393..8204707 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -3440,7 +3440,7 @@ lpfc_mbx_cmpl_reg_login(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
lpfc_printf_vlog(vport, KERN_INFO, LOG_SLI,
"0002 rpi:%x DID:%x flg:%x %d map:%x %p\n",
ndlp->nlp_rpi, ndlp->nlp_DID, ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount),
+ kref_read(&ndlp->kref),
ndlp->nlp_usg_map, ndlp);
if (ndlp->nlp_flag & NLP_REG_LOGIN_SEND)
ndlp->nlp_flag &= ~NLP_REG_LOGIN_SEND;
@@ -3861,7 +3861,7 @@ lpfc_mbx_cmpl_ns_reg_login(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
lpfc_printf_vlog(vport, KERN_INFO, LOG_SLI,
"0003 rpi:%x DID:%x flg:%x %d map%x %p\n",
ndlp->nlp_rpi, ndlp->nlp_DID, ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount),
+ kref_read(&ndlp->kref),
ndlp->nlp_usg_map, ndlp);
if (vport->port_state < LPFC_VPORT_READY) {
@@ -4238,7 +4238,7 @@ lpfc_enable_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
"0277 lpfc_enable_node: ndlp:x%p "
"usgmap:x%x refcnt:%d\n",
(void *)ndlp, ndlp->nlp_usg_map,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
return NULL;
}
/* The ndlp should not already be in active mode */
@@ -4248,7 +4248,7 @@ lpfc_enable_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
"0278 lpfc_enable_node: ndlp:x%p "
"usgmap:x%x refcnt:%d\n",
(void *)ndlp, ndlp->nlp_usg_map,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
return NULL;
}
@@ -4272,7 +4272,7 @@ lpfc_enable_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
"0008 rpi:%x DID:%x flg:%x refcnt:%d "
"map:%x %p\n", ndlp->nlp_rpi, ndlp->nlp_DID,
ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount),
+ kref_read(&ndlp->kref),
ndlp->nlp_usg_map, ndlp);
}
@@ -4546,7 +4546,7 @@ lpfc_unreg_rpi(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
(bf_get(lpfc_sli_intf_if_type,
&phba->sli4_hba.sli_intf) ==
LPFC_SLI_INTF_IF_TYPE_2) &&
- (atomic_read(&ndlp->kref.refcount) > 0)) {
+ (kref_read(&ndlp->kref) > 0)) {
mbox->context1 = lpfc_nlp_get(ndlp);
mbox->mbox_cmpl =
lpfc_sli4_unreg_rpi_cmpl_clr;
@@ -4695,14 +4695,14 @@ lpfc_cleanup_node(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
"0280 lpfc_cleanup_node: ndlp:x%p "
"usgmap:x%x refcnt:%d\n",
(void *)ndlp, ndlp->nlp_usg_map,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
lpfc_dequeue_node(vport, ndlp);
} else {
lpfc_printf_vlog(vport, KERN_WARNING, LOG_NODE,
"0281 lpfc_cleanup_node: ndlp:x%p "
"usgmap:x%x refcnt:%d\n",
(void *)ndlp, ndlp->nlp_usg_map,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
lpfc_disable_node(vport, ndlp);
}
@@ -4791,7 +4791,7 @@ lpfc_nlp_remove(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
lpfc_printf_vlog(vport, KERN_INFO, LOG_NODE,
"0005 rpi:%x DID:%x flg:%x %d map:%x %p\n",
ndlp->nlp_rpi, ndlp->nlp_DID, ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount),
+ kref_read(&ndlp->kref),
ndlp->nlp_usg_map, ndlp);
if ((mbox = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL))
!= NULL) {
@@ -5557,7 +5557,7 @@ lpfc_mbx_cmpl_fdmi_reg_login(struct lpfc_hba *phba, LPFC_MBOXQ_t *pmb)
lpfc_printf_vlog(vport, KERN_INFO, LOG_SLI,
"0004 rpi:%x DID:%x flg:%x %d map:%x %p\n",
ndlp->nlp_rpi, ndlp->nlp_DID, ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount),
+ kref_read(&ndlp->kref),
ndlp->nlp_usg_map, ndlp);
/*
* Start issuing Fabric-Device Management Interface (FDMI) command to
@@ -5728,7 +5728,7 @@ lpfc_nlp_init(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp,
"0007 rpi:%x DID:%x flg:%x refcnt:%d "
"map:%x %p\n", ndlp->nlp_rpi, ndlp->nlp_DID,
ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount),
+ kref_read(&ndlp->kref),
ndlp->nlp_usg_map, ndlp);
ndlp->active_rrqs_xri_bitmap =
@@ -5767,7 +5767,7 @@ lpfc_nlp_release(struct kref *kref)
"0279 lpfc_nlp_release: ndlp:x%p did %x "
"usgmap:x%x refcnt:%d rpi:%x\n",
(void *)ndlp, ndlp->nlp_DID, ndlp->nlp_usg_map,
- atomic_read(&ndlp->kref.refcount), ndlp->nlp_rpi);
+ kref_read(&ndlp->kref), ndlp->nlp_rpi);
/* remove ndlp from action. */
lpfc_nlp_remove(ndlp->vport, ndlp);
@@ -5804,7 +5804,7 @@ lpfc_nlp_get(struct lpfc_nodelist *ndlp)
lpfc_debugfs_disc_trc(ndlp->vport, LPFC_DISC_TRC_NODE,
"node get: did:x%x flg:x%x refcnt:x%x",
ndlp->nlp_DID, ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
/* The check of ndlp usage to prevent incrementing the
* ndlp reference count that is in the process of being
* released.
@@ -5817,7 +5817,7 @@ lpfc_nlp_get(struct lpfc_nodelist *ndlp)
"0276 lpfc_nlp_get: ndlp:x%p "
"usgmap:x%x refcnt:%d\n",
(void *)ndlp, ndlp->nlp_usg_map,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
return NULL;
} else
kref_get(&ndlp->kref);
@@ -5844,7 +5844,7 @@ lpfc_nlp_put(struct lpfc_nodelist *ndlp)
lpfc_debugfs_disc_trc(ndlp->vport, LPFC_DISC_TRC_NODE,
"node put: did:x%x flg:x%x refcnt:x%x",
ndlp->nlp_DID, ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
phba = ndlp->phba;
spin_lock_irqsave(&phba->ndlp_lock, flags);
/* Check the ndlp memory free acknowledge flag to avoid the
@@ -5857,7 +5857,7 @@ lpfc_nlp_put(struct lpfc_nodelist *ndlp)
"0274 lpfc_nlp_put: ndlp:x%p "
"usgmap:x%x refcnt:%d\n",
(void *)ndlp, ndlp->nlp_usg_map,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
return 1;
}
/* Check the ndlp inactivate log flag to avoid the possible
@@ -5870,7 +5870,7 @@ lpfc_nlp_put(struct lpfc_nodelist *ndlp)
"0275 lpfc_nlp_put: ndlp:x%p "
"usgmap:x%x refcnt:%d\n",
(void *)ndlp, ndlp->nlp_usg_map,
- atomic_read(&ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
return 1;
}
/* For last put, mark the ndlp usage flags to make sure no
@@ -5878,7 +5878,7 @@ lpfc_nlp_put(struct lpfc_nodelist *ndlp)
* in between the process when the final kref_put has been
* invoked on this ndlp.
*/
- if (atomic_read(&ndlp->kref.refcount) == 1) {
+ if (kref_read(&ndlp->kref) == 1) {
/* Indicate ndlp is put to inactive state. */
NLP_SET_IACT_REQ(ndlp);
/* Acknowledge ndlp memory free has been seen. */
@@ -5906,8 +5906,8 @@ lpfc_nlp_not_used(struct lpfc_nodelist *ndlp)
lpfc_debugfs_disc_trc(ndlp->vport, LPFC_DISC_TRC_NODE,
"node not used: did:x%x flg:x%x refcnt:x%x",
ndlp->nlp_DID, ndlp->nlp_flag,
- atomic_read(&ndlp->kref.refcount));
- if (atomic_read(&ndlp->kref.refcount) == 1)
+ kref_read(&ndlp->kref));
+ if (kref_read(&ndlp->kref) == 1)
if (lpfc_nlp_put(ndlp))
return 1;
return 0;
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index 4776fd8..64717c1 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -2660,8 +2660,7 @@ lpfc_cleanup(struct lpfc_vport *vport)
"usgmap:x%x refcnt:%d\n",
ndlp->nlp_DID, (void *)ndlp,
ndlp->nlp_usg_map,
- atomic_read(
- &ndlp->kref.refcount));
+ kref_read(&ndlp->kref));
}
break;
}