From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: akpm@linux-foundation.org, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, paulmck@linux.vnet.ibm.com,
laijs@cn.fujitsu.com, dipankar@in.ibm.com, josh@joshtriplett.org,
dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de,
peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
eric.dumazet@gmail.com, adobriyan@gmail.com
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: [RFC patch 3/3] kernel call_rcu usage: initialize rcu_head structures
Date: Fri, 19 Mar 2010 16:47:42 -0400 [thread overview]
Message-ID: <20100319205233.738370786@efficios.com> (raw)
In-Reply-To: 20100319204739.574593298@efficios.com
[-- Attachment #1: rcu-init-null.patch --]
[-- Type: text/plain, Size: 17342 bytes --]
Initialize rcu_head structures with rcu_head_init() before passing them to
call_rcu().
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
CC: akpm@linux-foundation.org
CC: mingo@elte.hu
CC: laijs@cn.fujitsu.com
CC: dipankar@in.ibm.com
CC: josh@joshtriplett.org
CC: dvhltc@us.ibm.com
CC: niv@us.ibm.com
CC: tglx@linutronix.de
CC: peterz@infradead.org
CC: rostedt@goodmis.org
CC: Valdis.Kletnieks@vt.edu
CC: dhowells@redhat.com
CC: eric.dumazet@gmail.com
CC: Alexey Dobriyan <adobriyan@gmail.com>
---
block/cfq-iosched.c | 2 +-
block/genhd.c | 2 +-
fs/file.c | 4 ++--
fs/fs-writeback.c | 13 +++++++++----
fs/partitions/check.c | 2 +-
kernel/fork.c | 1 +
kernel/pid.c | 1 +
kernel/rcutiny.c | 6 ++++++
kernel/rcutorture.c | 2 ++
kernel/rcutree.c | 4 ++++
mm/backing-dev.c | 2 +-
mm/slob.c | 2 +-
net/core/drop_monitor.c | 2 +-
net/ipv6/sit.c | 2 +-
net/ipv6/xfrm6_tunnel.c | 2 +-
net/netfilter/nf_conntrack_expect.c | 2 +-
net/netfilter/nf_conntrack_extend.c | 2 +-
net/netfilter/nfnetlink_queue.c | 2 +-
net/netlabel/netlabel_domainhash.c | 2 +-
net/netlabel/netlabel_unlabeled.c | 6 +++---
net/sctp/bind_addr.c | 2 +-
net/sctp/ipv6.c | 2 +-
net/sctp/protocol.c | 2 +-
23 files changed, 43 insertions(+), 24 deletions(-)
Index: linux-2.6-lttng/kernel/pid.c
===================================================================
--- linux-2.6-lttng.orig/kernel/pid.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/kernel/pid.c 2010-03-19 13:28:06.000000000 -0400
@@ -265,6 +265,7 @@ struct pid *alloc_pid(struct pid_namespa
get_pid_ns(ns);
pid->level = ns->level;
+ rcu_head_init(&pid->rcu);
atomic_set(&pid->count, 1);
for (type = 0; type < PIDTYPE_MAX; ++type)
INIT_HLIST_HEAD(&pid->tasks[type]);
Index: linux-2.6-lttng/kernel/fork.c
===================================================================
--- linux-2.6-lttng.orig/kernel/fork.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/kernel/fork.c 2010-03-19 13:28:06.000000000 -0400
@@ -1062,6 +1062,7 @@ static struct task_struct *copy_process(
INIT_LIST_HEAD(&p->children);
INIT_LIST_HEAD(&p->sibling);
rcu_copy_process(p);
+ rcu_head_init(&p->rcu);
p->vfork_done = NULL;
spin_lock_init(&p->alloc_lock);
Index: linux-2.6-lttng/kernel/rcutiny.c
===================================================================
--- linux-2.6-lttng.orig/kernel/rcutiny.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/kernel/rcutiny.c 2010-03-19 13:28:06.000000000 -0400
@@ -246,11 +246,13 @@ void rcu_barrier(void)
{
struct rcu_synchronize rcu;
+ rcu_head_init_on_stack(&rcu.head);
init_completion(&rcu.completion);
/* Will wake me after RCU finished. */
call_rcu(&rcu.head, wakeme_after_rcu);
/* Wait for it. */
wait_for_completion(&rcu.completion);
+ destroy_rcu_head_on_stack(&rcu.head);
}
EXPORT_SYMBOL_GPL(rcu_barrier);
@@ -258,11 +260,13 @@ void rcu_barrier_bh(void)
{
struct rcu_synchronize rcu;
+ rcu_head_init_on_stack(&rcu.head);
init_completion(&rcu.completion);
/* Will wake me after RCU finished. */
call_rcu_bh(&rcu.head, wakeme_after_rcu);
/* Wait for it. */
wait_for_completion(&rcu.completion);
+ destroy_rcu_head_on_stack(&rcu.head);
}
EXPORT_SYMBOL_GPL(rcu_barrier_bh);
@@ -270,11 +274,13 @@ void rcu_barrier_sched(void)
{
struct rcu_synchronize rcu;
+ rcu_head_init_on_stack(&rcu.head);
init_completion(&rcu.completion);
/* Will wake me after RCU finished. */
call_rcu_sched(&rcu.head, wakeme_after_rcu);
/* Wait for it. */
wait_for_completion(&rcu.completion);
+ destroy_rcu_head_on_stack(&rcu.head);
}
EXPORT_SYMBOL_GPL(rcu_barrier_sched);
Index: linux-2.6-lttng/kernel/rcutorture.c
===================================================================
--- linux-2.6-lttng.orig/kernel/rcutorture.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/kernel/rcutorture.c 2010-03-19 13:28:06.000000000 -0400
@@ -450,9 +450,11 @@ static void rcu_bh_torture_synchronize(v
{
struct rcu_bh_torture_synchronize rcu;
+ rcu_head_init_on_stack(&rcu.head);
init_completion(&rcu.completion);
call_rcu_bh(&rcu.head, rcu_bh_torture_wakeme_after_cb);
wait_for_completion(&rcu.completion);
+ destroy_rcu_head_on_stack(&rcu.head);
}
static struct rcu_torture_ops rcu_bh_ops = {
Index: linux-2.6-lttng/kernel/rcutree.c
===================================================================
--- linux-2.6-lttng.orig/kernel/rcutree.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/kernel/rcutree.c 2010-03-19 13:28:06.000000000 -0400
@@ -1449,11 +1449,13 @@ void synchronize_sched(void)
if (rcu_blocking_is_gp())
return;
+ rcu_head_init_on_stack(&rcu.head);
init_completion(&rcu.completion);
/* Will wake me after RCU finished. */
call_rcu_sched(&rcu.head, wakeme_after_rcu);
/* Wait for it. */
wait_for_completion(&rcu.completion);
+ destroy_rcu_head_on_stack(&rcu.head);
}
EXPORT_SYMBOL_GPL(synchronize_sched);
@@ -1473,11 +1475,13 @@ void synchronize_rcu_bh(void)
if (rcu_blocking_is_gp())
return;
+ rcu_head_init_on_stack(&rcu.head);
init_completion(&rcu.completion);
/* Will wake me after RCU finished. */
call_rcu_bh(&rcu.head, wakeme_after_rcu);
/* Wait for it. */
wait_for_completion(&rcu.completion);
+ destroy_rcu_head_on_stack(&rcu.head);
}
EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
Index: linux-2.6-lttng/mm/backing-dev.c
===================================================================
--- linux-2.6-lttng.orig/mm/backing-dev.c 2010-03-19 13:23:40.000000000 -0400
+++ linux-2.6-lttng/mm/backing-dev.c 2010-03-19 13:28:06.000000000 -0400
@@ -653,7 +653,7 @@ int bdi_init(struct backing_dev_info *bd
bdi->max_ratio = 100;
bdi->max_prop_frac = PROP_FRAC_BASE;
spin_lock_init(&bdi->wb_lock);
- INIT_RCU_HEAD(&bdi->rcu_head);
+ rcu_head_init(&bdi->rcu_head);
INIT_LIST_HEAD(&bdi->bdi_list);
INIT_LIST_HEAD(&bdi->wb_list);
INIT_LIST_HEAD(&bdi->work_list);
Index: linux-2.6-lttng/mm/slob.c
===================================================================
--- linux-2.6-lttng.orig/mm/slob.c 2010-03-19 13:23:40.000000000 -0400
+++ linux-2.6-lttng/mm/slob.c 2010-03-19 13:28:06.000000000 -0400
@@ -647,7 +647,7 @@ void kmem_cache_free(struct kmem_cache *
if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) {
struct slob_rcu *slob_rcu;
slob_rcu = b + (c->size - sizeof(struct slob_rcu));
- INIT_RCU_HEAD(&slob_rcu->head);
+ rcu_head_init(&slob_rcu->head);
slob_rcu->size = c->size;
call_rcu(&slob_rcu->head, kmem_rcu_free);
} else {
Index: linux-2.6-lttng/fs/file.c
===================================================================
--- linux-2.6-lttng.orig/fs/file.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/fs/file.c 2010-03-19 13:28:06.000000000 -0400
@@ -178,7 +178,7 @@ static struct fdtable * alloc_fdtable(un
fdt->open_fds = (fd_set *)data;
data += nr / BITS_PER_BYTE;
fdt->close_on_exec = (fd_set *)data;
- INIT_RCU_HEAD(&fdt->rcu);
+ rcu_head_init(&fdt->rcu);
fdt->next = NULL;
return fdt;
@@ -312,7 +312,7 @@ struct files_struct *dup_fd(struct files
new_fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init;
new_fdt->open_fds = (fd_set *)&newf->open_fds_init;
new_fdt->fd = &newf->fd_array[0];
- INIT_RCU_HEAD(&new_fdt->rcu);
+ rcu_head_init(&new_fdt->rcu);
new_fdt->next = NULL;
spin_lock(&oldf->file_lock);
Index: linux-2.6-lttng/fs/fs-writeback.c
===================================================================
--- linux-2.6-lttng.orig/fs/fs-writeback.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/fs/fs-writeback.c 2010-03-19 13:28:06.000000000 -0400
@@ -75,9 +75,13 @@ static inline bool bdi_work_on_stack(str
}
static inline void bdi_work_init(struct bdi_work *work,
- struct wb_writeback_args *args)
+ struct wb_writeback_args *args,
+ int on_stack)
{
- INIT_RCU_HEAD(&work->rcu_head);
+ if (on_stack)
+ rcu_head_init_on_stack(&work->rcu_head);
+ else
+ rcu_head_init(&work->rcu_head);
work->args = *args;
work->state = WS_USED;
}
@@ -201,7 +205,7 @@ static void bdi_alloc_queue_work(struct
*/
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (work) {
- bdi_work_init(work, args);
+ bdi_work_init(work, args, 0);
bdi_queue_work(bdi, work);
} else {
struct bdi_writeback *wb = &bdi->wb;
@@ -232,11 +236,12 @@ static void bdi_sync_writeback(struct ba
};
struct bdi_work work;
- bdi_work_init(&work, &args);
+ bdi_work_init(&work, &args, 1);
work.state |= WS_ONSTACK;
bdi_queue_work(bdi, &work);
bdi_wait_on_work_clear(&work);
+ destroy_rcu_head_on_stack(&work.rcu_head);
}
/**
Index: linux-2.6-lttng/fs/partitions/check.c
===================================================================
--- linux-2.6-lttng.orig/fs/partitions/check.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/fs/partitions/check.c 2010-03-19 13:28:06.000000000 -0400
@@ -454,7 +454,7 @@ struct hd_struct *add_partition(struct g
}
/* everything is up and running, commence */
- INIT_RCU_HEAD(&p->rcu_head);
+ rcu_head_init(&p->rcu_head);
rcu_assign_pointer(ptbl->part[partno], p);
/* suppress uevent if the disk supresses it */
Index: linux-2.6-lttng/block/cfq-iosched.c
===================================================================
--- linux-2.6-lttng.orig/block/cfq-iosched.c 2010-03-19 13:23:40.000000000 -0400
+++ linux-2.6-lttng/block/cfq-iosched.c 2010-03-19 13:28:06.000000000 -0400
@@ -3730,7 +3730,7 @@ static void *cfq_init_queue(struct reque
* second, in order to have larger depth for async operations.
*/
cfqd->last_delayed_sync = jiffies - HZ;
- INIT_RCU_HEAD(&cfqd->rcu);
+ rcu_head_init(&cfqd->rcu);
return cfqd;
}
Index: linux-2.6-lttng/block/genhd.c
===================================================================
--- linux-2.6-lttng.orig/block/genhd.c 2010-03-19 13:23:40.000000000 -0400
+++ linux-2.6-lttng/block/genhd.c 2010-03-19 13:28:06.000000000 -0400
@@ -987,7 +987,7 @@ int disk_expand_part_tbl(struct gendisk
if (!new_ptbl)
return -ENOMEM;
- INIT_RCU_HEAD(&new_ptbl->rcu_head);
+ rcu_head_init(&new_ptbl->rcu_head);
new_ptbl->len = target;
for (i = 0; i < len; i++)
Index: linux-2.6-lttng/net/netfilter/nfnetlink_queue.c
===================================================================
--- linux-2.6-lttng.orig/net/netfilter/nfnetlink_queue.c 2010-03-19 13:23:40.000000000 -0400
+++ linux-2.6-lttng/net/netfilter/nfnetlink_queue.c 2010-03-19 13:28:06.000000000 -0400
@@ -112,7 +112,7 @@ instance_create(u_int16_t queue_num, int
inst->copy_mode = NFQNL_COPY_NONE;
spin_lock_init(&inst->lock);
INIT_LIST_HEAD(&inst->queue_list);
- INIT_RCU_HEAD(&inst->rcu);
+ rcu_head_init(&inst->rcu);
if (!try_module_get(THIS_MODULE)) {
err = -EAGAIN;
Index: linux-2.6-lttng/net/core/drop_monitor.c
===================================================================
--- linux-2.6-lttng.orig/net/core/drop_monitor.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/net/core/drop_monitor.c 2010-03-19 13:28:06.000000000 -0400
@@ -296,7 +296,7 @@ static int dropmon_net_event(struct noti
new_stat->dev = dev;
new_stat->last_rx = jiffies;
- INIT_RCU_HEAD(&new_stat->rcu);
+ rcu_head_init(&new_stat->rcu);
spin_lock(&trace_state_lock);
list_add_rcu(&new_stat->list, &hw_stats_list);
spin_unlock(&trace_state_lock);
Index: linux-2.6-lttng/net/ipv6/sit.c
===================================================================
--- linux-2.6-lttng.orig/net/ipv6/sit.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/net/ipv6/sit.c 2010-03-19 13:28:06.000000000 -0400
@@ -364,7 +364,7 @@ ipip6_tunnel_add_prl(struct ip_tunnel *t
goto out;
}
- INIT_RCU_HEAD(&p->rcu_head);
+ rcu_head_init(&p->rcu_head);
p->next = t->prl;
p->addr = a->addr;
p->flags = a->flags;
Index: linux-2.6-lttng/net/ipv6/xfrm6_tunnel.c
===================================================================
--- linux-2.6-lttng.orig/net/ipv6/xfrm6_tunnel.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/net/ipv6/xfrm6_tunnel.c 2010-03-19 13:28:06.000000000 -0400
@@ -187,7 +187,7 @@ alloc_spi:
if (!x6spi)
goto out;
- INIT_RCU_HEAD(&x6spi->rcu_head);
+ rcu_head_init(&x6spi->rcu_head);
memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
x6spi->spi = spi;
atomic_set(&x6spi->refcnt, 1);
Index: linux-2.6-lttng/net/netfilter/nf_conntrack_expect.c
===================================================================
--- linux-2.6-lttng.orig/net/netfilter/nf_conntrack_expect.c 2010-03-19 13:23:40.000000000 -0400
+++ linux-2.6-lttng/net/netfilter/nf_conntrack_expect.c 2010-03-19 13:28:06.000000000 -0400
@@ -232,7 +232,7 @@ struct nf_conntrack_expect *nf_ct_expect
new->master = me;
atomic_set(&new->use, 1);
- INIT_RCU_HEAD(&new->rcu);
+ rcu_head_init(&new->rcu);
return new;
}
EXPORT_SYMBOL_GPL(nf_ct_expect_alloc);
Index: linux-2.6-lttng/net/netfilter/nf_conntrack_extend.c
===================================================================
--- linux-2.6-lttng.orig/net/netfilter/nf_conntrack_extend.c 2010-03-19 13:23:40.000000000 -0400
+++ linux-2.6-lttng/net/netfilter/nf_conntrack_extend.c 2010-03-19 13:28:06.000000000 -0400
@@ -59,7 +59,7 @@ nf_ct_ext_create(struct nf_ct_ext **ext,
if (!*ext)
return NULL;
- INIT_RCU_HEAD(&(*ext)->rcu);
+ rcu_head_init(&(*ext)->rcu);
(*ext)->offset[id] = off;
(*ext)->len = len;
Index: linux-2.6-lttng/net/netlabel/netlabel_domainhash.c
===================================================================
--- linux-2.6-lttng.orig/net/netlabel/netlabel_domainhash.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/net/netlabel/netlabel_domainhash.c 2010-03-19 13:28:06.000000000 -0400
@@ -315,7 +315,7 @@ int netlbl_domhsh_add(struct netlbl_dom_
entry_old = netlbl_domhsh_search_def(entry->domain);
if (entry_old == NULL) {
entry->valid = 1;
- INIT_RCU_HEAD(&entry->rcu);
+ rcu_head_init(&entry->rcu);
if (entry->domain != NULL) {
u32 bkt = netlbl_domhsh_hash(entry->domain);
Index: linux-2.6-lttng/net/netlabel/netlabel_unlabeled.c
===================================================================
--- linux-2.6-lttng.orig/net/netlabel/netlabel_unlabeled.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/net/netlabel/netlabel_unlabeled.c 2010-03-19 13:28:06.000000000 -0400
@@ -327,7 +327,7 @@ static int netlbl_unlhsh_add_addr4(struc
entry->list.addr = addr->s_addr & mask->s_addr;
entry->list.mask = mask->s_addr;
entry->list.valid = 1;
- INIT_RCU_HEAD(&entry->rcu);
+ rcu_head_init(&entry->rcu);
entry->secid = secid;
spin_lock(&netlbl_unlhsh_lock);
@@ -373,7 +373,7 @@ static int netlbl_unlhsh_add_addr6(struc
entry->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
ipv6_addr_copy(&entry->list.mask, mask);
entry->list.valid = 1;
- INIT_RCU_HEAD(&entry->rcu);
+ rcu_head_init(&entry->rcu);
entry->secid = secid;
spin_lock(&netlbl_unlhsh_lock);
@@ -410,7 +410,7 @@ static struct netlbl_unlhsh_iface *netlb
INIT_LIST_HEAD(&iface->addr4_list);
INIT_LIST_HEAD(&iface->addr6_list);
iface->valid = 1;
- INIT_RCU_HEAD(&iface->rcu);
+ rcu_head_init(&iface->rcu);
spin_lock(&netlbl_unlhsh_lock);
if (ifindex > 0) {
Index: linux-2.6-lttng/net/sctp/bind_addr.c
===================================================================
--- linux-2.6-lttng.orig/net/sctp/bind_addr.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/net/sctp/bind_addr.c 2010-03-19 13:28:06.000000000 -0400
@@ -186,7 +186,7 @@ int sctp_add_bind_addr(struct sctp_bind_
addr->valid = 1;
INIT_LIST_HEAD(&addr->list);
- INIT_RCU_HEAD(&addr->rcu);
+ rcu_head_init(&addr->rcu);
/* We always hold a socket lock when calling this function,
* and that acts as a writer synchronizing lock.
Index: linux-2.6-lttng/net/sctp/ipv6.c
===================================================================
--- linux-2.6-lttng.orig/net/sctp/ipv6.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/net/sctp/ipv6.c 2010-03-19 13:28:06.000000000 -0400
@@ -381,7 +381,7 @@ static void sctp_v6_copy_addrlist(struct
addr->a.v6.sin6_scope_id = dev->ifindex;
addr->valid = 1;
INIT_LIST_HEAD(&addr->list);
- INIT_RCU_HEAD(&addr->rcu);
+ rcu_head_init(&addr->rcu);
list_add_tail(&addr->list, addrlist);
}
}
Index: linux-2.6-lttng/net/sctp/protocol.c
===================================================================
--- linux-2.6-lttng.orig/net/sctp/protocol.c 2010-03-19 13:23:39.000000000 -0400
+++ linux-2.6-lttng/net/sctp/protocol.c 2010-03-19 13:28:06.000000000 -0400
@@ -188,7 +188,7 @@ static void sctp_v4_copy_addrlist(struct
addr->a.v4.sin_addr.s_addr = ifa->ifa_local;
addr->valid = 1;
INIT_LIST_HEAD(&addr->list);
- INIT_RCU_HEAD(&addr->rcu);
+ rcu_head_init(&addr->rcu);
list_add_tail(&addr->list, addrlist);
}
}
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
prev parent reply other threads:[~2010-03-19 20:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-19 20:47 [RFC patch 0/3] RCU head debug objects Mathieu Desnoyers
2010-03-19 20:47 ` [RFC patch 1/3] Debugobjects transition check Mathieu Desnoyers
2010-03-19 20:47 ` [RFC patch 2/3] tree/tiny rcu: Add debug RCU head objects (v3) Mathieu Desnoyers
2010-03-19 22:10 ` Alexey Dobriyan
2010-03-19 22:49 ` Paul E. McKenney
2010-03-22 3:33 ` Lai Jiangshan
2010-03-22 14:22 ` Mathieu Desnoyers
2010-03-19 20:47 ` Mathieu Desnoyers [this message]
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