From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Tom Zanussi <zanussi@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>
Subject: [PATCH 4.19 26/92] tracing: trigger: Replace unneeded RCU-list traversals
Date: Tue, 28 Jan 2020 15:07:54 +0100 [thread overview]
Message-ID: <20200128135812.413518101@linuxfoundation.org> (raw)
In-Reply-To: <20200128135809.344954797@linuxfoundation.org>
From: Masami Hiramatsu <mhiramat@kernel.org>
commit aeed8aa3874dc15b9d82a6fe796fd7cfbb684448 upstream.
With CONFIG_PROVE_RCU_LIST, I had many suspicious RCU warnings
when I ran ftracetest trigger testcases.
-----
# dmesg -c > /dev/null
# ./ftracetest test.d/trigger
...
# dmesg | grep "RCU-list traversed" | cut -f 2 -d ] | cut -f 2 -d " "
kernel/trace/trace_events_hist.c:6070
kernel/trace/trace_events_hist.c:1760
kernel/trace/trace_events_hist.c:5911
kernel/trace/trace_events_trigger.c:504
kernel/trace/trace_events_hist.c:1810
kernel/trace/trace_events_hist.c:3158
kernel/trace/trace_events_hist.c:3105
kernel/trace/trace_events_hist.c:5518
kernel/trace/trace_events_hist.c:5998
kernel/trace/trace_events_hist.c:6019
kernel/trace/trace_events_hist.c:6044
kernel/trace/trace_events_trigger.c:1500
kernel/trace/trace_events_trigger.c:1540
kernel/trace/trace_events_trigger.c:539
kernel/trace/trace_events_trigger.c:584
-----
I investigated those warnings and found that the RCU-list
traversals in event trigger and hist didn't need to use
RCU version because those were called only under event_mutex.
I also checked other RCU-list traversals related to event
trigger list, and found that most of them were called from
event_hist_trigger_func() or hist_unregister_trigger() or
register/unregister functions except for a few cases.
Replace these unneeded RCU-list traversals with normal list
traversal macro and lockdep_assert_held() to check the
event_mutex is held.
Link: http://lkml.kernel.org/r/157680910305.11685.15110237954275915782.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: 30350d65ac567 ("tracing: Add variable support to hist triggers")
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
kernel/trace/trace_events_hist.c | 38 ++++++++++++++++++++++++++----------
kernel/trace/trace_events_trigger.c | 20 ++++++++++++++----
2 files changed, 43 insertions(+), 15 deletions(-)
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1511,11 +1511,13 @@ static struct hist_field *find_var(struc
struct event_trigger_data *test;
struct hist_field *hist_field;
+ lockdep_assert_held(&event_mutex);
+
hist_field = find_var_field(hist_data, var_name);
if (hist_field)
return hist_field;
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
test_data = test->private_data;
hist_field = find_var_field(test_data, var_name);
@@ -1565,7 +1567,9 @@ static struct hist_field *find_file_var(
struct event_trigger_data *test;
struct hist_field *hist_field;
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
test_data = test->private_data;
hist_field = find_var_field(test_data, var_name);
@@ -2828,7 +2832,9 @@ static char *find_trigger_filter(struct
{
struct event_trigger_data *test;
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
if (test->private_data == hist_data)
return test->filter_str;
@@ -2879,9 +2885,11 @@ find_compatible_hist(struct hist_trigger
struct event_trigger_data *test;
unsigned int n_keys;
+ lockdep_assert_held(&event_mutex);
+
n_keys = target_hist_data->n_fields - target_hist_data->n_vals;
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
hist_data = test->private_data;
@@ -4905,7 +4913,7 @@ static int hist_show(struct seq_file *m,
goto out_unlock;
}
- list_for_each_entry_rcu(data, &event_file->triggers, list) {
+ list_for_each_entry(data, &event_file->triggers, list) {
if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
hist_trigger_show(m, data, n++);
}
@@ -5296,7 +5304,9 @@ static int hist_register_trigger(char *g
if (hist_data->attrs->name && !named_data)
goto new;
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
if (!hist_trigger_match(data, test, named_data, false))
continue;
@@ -5380,10 +5390,12 @@ static bool have_hist_trigger_match(stru
struct event_trigger_data *test, *named_data = NULL;
bool match = false;
+ lockdep_assert_held(&event_mutex);
+
if (hist_data->attrs->name)
named_data = find_named_trigger(hist_data->attrs->name);
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
if (hist_trigger_match(data, test, named_data, false)) {
match = true;
@@ -5401,10 +5413,12 @@ static bool hist_trigger_check_refs(stru
struct hist_trigger_data *hist_data = data->private_data;
struct event_trigger_data *test, *named_data = NULL;
+ lockdep_assert_held(&event_mutex);
+
if (hist_data->attrs->name)
named_data = find_named_trigger(hist_data->attrs->name);
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
if (!hist_trigger_match(data, test, named_data, false))
continue;
@@ -5426,10 +5440,12 @@ static void hist_unregister_trigger(char
struct event_trigger_data *test, *named_data = NULL;
bool unregistered = false;
+ lockdep_assert_held(&event_mutex);
+
if (hist_data->attrs->name)
named_data = find_named_trigger(hist_data->attrs->name);
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
if (!hist_trigger_match(data, test, named_data, false))
continue;
@@ -5455,7 +5471,9 @@ static bool hist_file_check_refs(struct
struct hist_trigger_data *hist_data;
struct event_trigger_data *test;
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
hist_data = test->private_data;
if (check_var_refs(hist_data))
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -495,7 +495,9 @@ void update_cond_flag(struct trace_event
struct event_trigger_data *data;
bool set_cond = false;
- list_for_each_entry_rcu(data, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(data, &file->triggers, list) {
if (data->filter || event_command_post_trigger(data->cmd_ops) ||
event_command_needs_rec(data->cmd_ops)) {
set_cond = true;
@@ -530,7 +532,9 @@ static int register_trigger(char *glob,
struct event_trigger_data *test;
int ret = 0;
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == data->cmd_ops->trigger_type) {
ret = -EEXIST;
goto out;
@@ -575,7 +579,9 @@ static void unregister_trigger(char *glo
struct event_trigger_data *data;
bool unregistered = false;
- list_for_each_entry_rcu(data, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(data, &file->triggers, list) {
if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) {
unregistered = true;
list_del_rcu(&data->list);
@@ -1490,7 +1496,9 @@ int event_enable_register_trigger(char *
struct event_trigger_data *test;
int ret = 0;
- list_for_each_entry_rcu(test, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(test, &file->triggers, list) {
test_enable_data = test->private_data;
if (test_enable_data &&
(test->cmd_ops->trigger_type ==
@@ -1530,7 +1538,9 @@ void event_enable_unregister_trigger(cha
struct event_trigger_data *data;
bool unregistered = false;
- list_for_each_entry_rcu(data, &file->triggers, list) {
+ lockdep_assert_held(&event_mutex);
+
+ list_for_each_entry(data, &file->triggers, list) {
enable_data = data->private_data;
if (enable_data &&
(data->cmd_ops->trigger_type ==
next prev parent reply other threads:[~2020-01-28 14:31 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-28 14:07 [PATCH 4.19 00/92] 4.19.100-stable review Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 01/92] can, slip: Protect tty->disc_data in write_wakeup and close with RCU Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 02/92] firestream: fix memory leaks Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 03/92] gtp: make sure only SOCK_DGRAM UDP sockets are accepted Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 04/92] ipv6: sr: remove SKB_GSO_IPXIP6 on End.D* actions Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 05/92] net: bcmgenet: Use netif_tx_napi_add() for TX NAPI Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 06/92] net: cxgb3_main: Add CAP_NET_ADMIN check to CHELSIO_GET_MEM Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 07/92] net: ip6_gre: fix moving ip6gre between namespaces Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 08/92] net, ip6_tunnel: fix namespaces move Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 09/92] net, ip_tunnel: " Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 10/92] net: rtnetlink: validate IFLA_MTU attribute in rtnl_create_link() Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 11/92] net_sched: fix datalen for ematch Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 12/92] net-sysfs: Fix reference count leak in rx|netdev_queue_add_kobject Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 13/92] net-sysfs: fix netdev_queue_add_kobject() breakage Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 14/92] net-sysfs: Call dev_hold always in netdev_queue_add_kobject Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 15/92] net-sysfs: Call dev_hold always in rx_queue_add_kobject Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 16/92] net-sysfs: Fix reference count leak Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 17/92] net: usb: lan78xx: Add .ndo_features_check Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 18/92] Revert "udp: do rmem bulk free even if the rx sk queue is empty" Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 19/92] tcp_bbr: improve arithmetic division in bbr_update_bw() Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 20/92] tcp: do not leave dangling pointers in tp->highest_sack Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 21/92] tun: add mutex_unlock() call and napi.skb clearing in tun_get_user() Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 22/92] afs: Fix characters allowed into cell names Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 23/92] hwmon: (adt7475) Make volt2reg return same reg as reg2volt input Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 24/92] hwmon: (core) Do not use device managed functions for memory allocations Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 25/92] PCI: Mark AMD Navi14 GPU rev 0xc5 ATS as broken Greg Kroah-Hartman
2020-01-28 14:07 ` Greg Kroah-Hartman [this message]
2020-01-28 14:07 ` [PATCH 4.19 27/92] Input: keyspan-remote - fix control-message timeouts Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 28/92] Revert "Input: synaptics-rmi4 - dont increment rmiaddr for SMBus transfers" Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 29/92] ARM: 8950/1: ftrace/recordmcount: filter relocation types Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 30/92] mmc: tegra: fix SDR50 tuning override Greg Kroah-Hartman
2020-01-28 14:07 ` [PATCH 4.19 31/92] mmc: sdhci: fix minimum clock rate for v3 controller Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 32/92] Documentation: Document arm64 kpti control Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 33/92] Input: pm8xxx-vib - fix handling of separate enable register Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 34/92] Input: sur40 - fix interface sanity checks Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 35/92] Input: gtco - fix endpoint sanity check Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 36/92] Input: aiptek " Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 37/92] Input: pegasus_notetaker " Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 38/92] Input: sun4i-ts - add a check for devm_thermal_zone_of_sensor_register Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 39/92] netfilter: nft_osf: add missing check for DREG attribute Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 40/92] hwmon: (nct7802) Fix voltage limits to wrong registers Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 41/92] scsi: RDMA/isert: Fix a recently introduced regression related to logout Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 42/92] tracing: xen: Ordered comparison of function pointers Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 43/92] do_last(): fetch directory ->i_mode and ->i_uid before its too late Greg Kroah-Hartman
2020-01-31 10:08 ` Rantala, Tommi T. (Nokia - FI/Espoo)
2020-01-31 12:20 ` Al Viro
2020-01-31 13:57 ` Rantala, Tommi T. (Nokia - FI/Espoo)
2020-01-28 14:08 ` [PATCH 4.19 44/92] net/sonic: Add mutual exclusion for accessing shared state Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 45/92] net/sonic: Clear interrupt flags immediately Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 46/92] net/sonic: Use MMIO accessors Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 47/92] net/sonic: Fix interface error stats collection Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 48/92] net/sonic: Fix receive buffer handling Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 49/92] net/sonic: Avoid needless receive descriptor EOL flag updates Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 50/92] net/sonic: Improve receive descriptor status flag check Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 51/92] net/sonic: Fix receive buffer replenishment Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 52/92] net/sonic: Quiesce SONIC before re-initializing descriptor memory Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 53/92] net/sonic: Fix command register usage Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 54/92] net/sonic: Fix CAM initialization Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 55/92] net/sonic: Prevent tx watchdog timeout Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 56/92] tracing: Use hist triggers var_ref array to destroy var_refs Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 57/92] tracing: Remove open-coding of hist trigger var_ref management Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 58/92] tracing: Fix histogram code when expression has same var as value Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 59/92] sd: Fix REQ_OP_ZONE_REPORT completion handling Greg Kroah-Hartman
2020-01-28 18:02 ` Pavel Machek
2020-01-28 18:15 ` Greg Kroah-Hartman
2020-01-29 1:05 ` Damien Le Moal
2020-01-28 14:08 ` [PATCH 4.19 60/92] crypto: geode-aes - switch to skcipher for cbc(aes) fallback Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 61/92] coresight: etb10: Do not call smp_processor_id from preemptible Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 62/92] coresight: tmc-etf: " Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 63/92] libertas: Fix two buffer overflows at parsing bss descriptor Greg Kroah-Hartman
2020-01-29 22:47 ` Pavel Machek
2020-01-28 14:08 ` [PATCH 4.19 64/92] media: v4l2-ioctl.c: zero reserved fields for S/TRY_FMT Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 65/92] scsi: iscsi: Avoid potential deadlock in iscsi_if_rx func Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 66/92] netfilter: ipset: use bitmap infrastructure completely Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 67/92] netfilter: nf_tables: add __nft_chain_type_get() Greg Kroah-Hartman
2020-01-28 18:13 ` Pavel Machek
2020-01-28 14:08 ` [PATCH 4.19 68/92] net/x25: fix nonblocking connect Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 69/92] mm/memory_hotplug: make remove_memory() take the device_hotplug_lock Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 70/92] mm, sparse: drop pgdat_resize_lock in sparse_add/remove_one_section() Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 71/92] mm, sparse: pass nid instead of pgdat to sparse_add_one_section() Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 72/92] drivers/base/memory.c: remove an unnecessary check on NR_MEM_SECTIONS Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 73/92] mm, memory_hotplug: add nid parameter to arch_remove_memory Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 74/92] mm/memory_hotplug: release memory resource after arch_remove_memory() Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 75/92] drivers/base/memory.c: clean up relics in function parameters Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 76/92] mm, memory_hotplug: update a comment in unregister_memory() Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 77/92] mm/memory_hotplug: make unregister_memory_section() never fail Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 78/92] mm/memory_hotplug: make __remove_section() " Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 79/92] powerpc/mm: Fix section mismatch warning Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 80/92] mm/memory_hotplug: make __remove_pages() and arch_remove_memory() never fail Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 88/92] mm/hotplug: kill is_dev_zone() usage in __remove_pages() Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 89/92] drivers/base/node.c: simplify unregister_memory_block_under_nodes() Greg Kroah-Hartman
2020-01-28 14:08 ` [PATCH 4.19 91/92] mm/memory_hotplug: fix try_offline_node() Greg Kroah-Hartman
2020-01-28 14:09 ` [PATCH 4.19 92/92] mm/memory_hotplug: shrink zones when offlining memory Greg Kroah-Hartman
2020-01-28 23:03 ` [PATCH 4.19 00/92] 4.19.100-stable review shuah
2020-01-29 4:54 ` Naresh Kamboju
2020-01-29 11:31 ` Pavel Machek
2020-01-29 12:57 ` Greg Kroah-Hartman
2020-01-29 13:16 ` Jon Hunter
2020-01-29 14:43 ` Guenter Roeck
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