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git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
Pull LoongArch updates from Huacai Chen:
- Adjust the 'make install' operation
- Support SCHED_MC (Multi-core scheduler)
- Enable ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
- Enable HAVE_ARCH_STACKLEAK
- Increase max supported CPUs up to 2048
- Introduce the numa_memblks conversion
- Add PWM controller nodes in dts
- Some bug fixes and other small changes
* tag 'loongarch-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
platform/loongarch: laptop: Unregister generic_sub_drivers on exit
platform/loongarch: laptop: Add backlight power control support
platform/loongarch: laptop: Get brightness setting from EC on probe
LoongArch: dts: Add PWM support to Loongson-2K2000
LoongArch: dts: Add PWM support to Loongson-2K1000
LoongArch: dts: Add PWM support to Loongson-2K0500
LoongArch: vDSO: Correctly use asm parameters in syscall wrappers
LoongArch: Fix panic caused by NULL-PMD in huge_pte_offset()
LoongArch: Preserve firmware configuration when desired
LoongArch: Avoid using $r0/$r1 as "mask" for csrxchg
LoongArch: Introduce the numa_memblks conversion
LoongArch: Increase max supported CPUs up to 2048
LoongArch: Enable HAVE_ARCH_STACKLEAK
LoongArch: Enable ARCH_SUPPORTS_MSEAL_SYSTEM_MAPPINGS
LoongArch: Add SCHED_MC (Multi-core scheduler) support
LoongArch: Add some annotations in archhelp
LoongArch: Using generic scripts/install.sh in `make install`
LoongArch: Add a default install.sh
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A collection of fix patches for the 6.16-rc1 merge window.
Most of changes are about ASoC, especially lots of AVS driver fixes.
Larger LOCs are seen in TAS571x codec drivers, but the changes are
trivial and safe. The rest are all device-specific small fixes"
* tag 'sound-fix-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (27 commits)
ASoC: Intel: avs: boards: Fix rt5663 front end name
ASoC: Intel: avs: Simplify verification of parse_int_array() result
ALSA: usb-audio: Add implicit feedback quirk for RODE AI-1
ALSA: hda: Ignore unsol events for cards being shut down
ALSA: hda: Add new pci id for AMD GPU display HD audio controller
ALSA: hda: cs35l41: Constify regmap_irq_chip
ALSA: usb-audio: Add a quirk for Lenovo Thinkpad Thunderbolt 3 dock
ASoC: ti: omap-hdmi: Re-add dai_link->platform to fix card init
ASoC: pcm: Do not open FEs with no BEs connected
ASoC: rt1320: fix speaker noise when volume bar is 100%
ASoC: Intel: avs: Include missing string.h
ASoC: Intel: avs: Verify content returned by parse_int_array()
ASoC: Intel: avs: Verify kcalloc() status when setting constraints
ASoC: Intel: avs: Fix paths in MODULE_FIRMWARE hints
ASoC: Intel: avs: Fix possible null-ptr-deref when initing hw
ASoC: Intel: avs: Fix PPLCxFMT calculation
ASoC: Intel: avs: Fix deadlock when the failing IPC is SET_D0IX
ASoC: codecs: hda: Fix RPM usage count underflow
ASoC: amd: yc: Add support for Lenovo Yoga 7 16ARP8
ASoC: tas571x: fix tas5733 num_controls
...
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When the execution of ath12k_core_hw_group_assign() or
ath12k_core_hw_group_create() fails, the registered notifier chain is not
unregistered properly. Its memory is freed after rmmod, which may trigger
to a use-after-free (UAF) issue if there is a subsequent access to this
notifier chain.
Fixes the issue by calling ath12k_core_panic_notifier_unregister() in
failure cases.
Call trace:
notifier_chain_register+0x4c/0x1f0 (P)
atomic_notifier_chain_register+0x38/0x68
ath12k_core_init+0x50/0x4e8 [ath12k]
ath12k_pci_probe+0x5f8/0xc28 [ath12k]
pci_device_probe+0xbc/0x1a8
really_probe+0xc8/0x3a0
__driver_probe_device+0x84/0x1b0
driver_probe_device+0x44/0x130
__driver_attach+0xcc/0x208
bus_for_each_dev+0x84/0x100
driver_attach+0x2c/0x40
bus_add_driver+0x130/0x260
driver_register+0x70/0x138
__pci_register_driver+0x68/0x80
ath12k_pci_init+0x30/0x68 [ath12k]
ath12k_init+0x28/0x78 [ath12k]
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Fixes: 6f245ea0ec6c ("wifi: ath12k: introduce device group abstraction")
Signed-off-by: Miaoqing Pan <miaoqing.pan@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <quic_bqiang@quicinc.com>
Link: https://patch.msgid.link/20250604055250.1228501-1-miaoqing.pan@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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Currently a warning is reported when running:
% scripts/kernel-doc -Wall -Werror -none drivers/net/wireless/ath/ath12k/hal.h
Warning: drivers/net/wireless/ath/ath12k/hal.h:596 Enum value 'HAL_REO_CMD_RESOURCE_BLOCKED' not described in enum 'hal_reo_cmd_status'
Add the missing description of HAL_REO_CMD_RESOURCE_BLOCKED.
Link: https://patch.msgid.link/20250605-hal_reo_cmd_status-kdoc-v1-1-e59f4b814b88@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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GCC_GCC_PCIE_HOT_RST is wrongly defined for WCN7850, causing kernel crash
on some specific platforms.
Since this register is divergent for WCN7850 and QCN9274, move it to
register table to allow different definitions. Then correct the register
address for WCN7850 to fix this issue.
Note IPQ5332 is not affected as it is not PCIe based device.
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Reported-by: Parth Pancholi <parth.pancholi@toradex.com>
Closes: https://lore.kernel.org/all/86899b2235a59c9134603beebe08f2bb0b244ea0.camel@gmail.com
Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Tested-by: Parth Pancholi <parth.pancholi@toradex.com>
Link: https://patch.msgid.link/20250523-ath12k-wrong-global-reset-addr-v1-1-3b06eb556196@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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ath11k_core_qmi_firmware_ready
if ath11k_crypto_mode is invalid (not ATH11K_CRYPT_MODE_SW/ATH11K_CRYPT_MODE_HW),
ath11k_core_qmi_firmware_ready() will not undo some actions that was previously
started/configured. Do the validation as soon as possible in order to avoid
undoing actions in that case and also to fix the following smatch warning:
drivers/net/wireless/ath/ath11k/core.c:2166 ath11k_core_qmi_firmware_ready()
warn: missing unwind goto?
Signed-off-by: Rodrigo Gobbi <rodrigo.gobbi.7@gmail.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/r/202304151955.oqAetVFd-lkp@intel.com/
Fixes: aa2092a9bab3 ("ath11k: add raw mode and software crypto support")
Reviewed-by: Baochen Qiang <quic_bqiang@quicinc.com>
Link: https://patch.msgid.link/20250522200519.16858-1-rodrigo.gobbi.7@gmail.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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Currently to get firmware stats, ath11k_mac_op_get_txpower() calls
ath11k_fw_stats_request() and ath11k_mac_op_sta_statistics() calls
ath11k_mac_get_fw_stats(). Those two helpers are basically doing
the same, except for:
1. ath11k_mac_get_fw_stats() verifies ar->state inside itself.
2. ath11k_mac_get_fw_stats() calls ath11k_mac_fw_stats_request()
which then calls ath11k_mac_fw_stats_reset() to free pdev/vdev
stats whereas only pdev stats are freed by ath11k_fw_stats_request().
3. ath11k_mac_get_fw_stats() waits for ar->fw_stats_complete and
ar->fw_stats_done, whereas ath11k_fw_stats_request() only waits for
ar->fw_stats_complete.
Change to call ath11k_mac_get_fw_stats() in ath11k_mac_op_get_txpower().
This is valid because:
1. ath11k_mac_op_get_txpower() also has the same request on ar->state.
2. it is harmless to call ath11k_fw_stats_vdevs_free() since
ar->fw_stats.vdevs should be empty and there should be no one
expecting it at that time.
3. ath11k_mac_op_get_txpower() only needs pdev stats. For pdev stats,
ar->fw_stats_done is set to true whenever ar->fw_stats_complete is
set to true in ath11k_update_stats_event(). So additional wait on
ar->fw_stats_done does not wast any time.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250220082448.31039-8-quic_bqiang@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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Currently ath11k_mac_get_fw_stats() is acquiring/releasing ar->conf_mutex by itself.
In order to reuse this function in a context where that lock is already taken, move
lock handling to its callers, then the function itself only has to assert it.
There is only one caller now, i.e., ath11k_mac_op_sta_statistics(), so add lock handling
there.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250220082448.31039-7-quic_bqiang@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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Currently RCU lock and ar->data_lock are acquired in a sequence of
rcu_read_lock()
spin_lock_bh(&ar->data_lock)
but released in a sequence of
rcu_read_unlock()
spin_unlock_bh(&ar->data_lock)
Although there are no apparent issues with this, reorder them to
achieve symmetry.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Acked-by: Kalle Valo <kvalo@kernel.org>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250220082448.31039-6-quic_bqiang@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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Commit b488c766442f ("ath11k: report rssi of each chain to mac80211 for QCA6390/WCN6855")
and commit c3b39553fc77 ("ath11k: add signal report to mac80211 for QCA6390 and WCN6855")
call debugfs functions in mac ops. Those functions are no-ops if CONFIG_ATH11K_DEBUGFS is
not enabled, thus cause wrong status reported.
Move them to mac.c.
Besides, since WMI_REQUEST_RSSI_PER_CHAIN_STAT and WMI_REQUEST_VDEV_STAT stats could also
be requested via mac ops, process them directly in ath11k_update_stats_event().
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
Fixes: b488c766442f ("ath11k: report rssi of each chain to mac80211 for QCA6390/WCN6855")
Fixes: c3b39553fc77 ("ath11k: add signal report to mac80211 for QCA6390 and WCN6855")
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250220082448.31039-5-quic_bqiang@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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For WMI_REQUEST_VDEV_STAT request, firmware might split response into
multiple events dut to buffer limit, hence currently in
ath11k_debugfs_fw_stats_process() we wait until all events received.
In case there is no vdev started, this results in that below condition
would never get satisfied
((++ar->fw_stats.num_vdev_recvd) == total_vdevs_started)
finally the requestor would be blocked until wait time out.
The same applies to WMI_REQUEST_BCN_STAT request as well due to:
((++ar->fw_stats.num_bcn_recvd) == ar->num_started_vdevs)
Change to check the number of started vdev first: if it is zero, finish
wait directly; if not, follow the old way.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250220082448.31039-4-quic_bqiang@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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Currently ath11k_debugfs_fw_stats_process() is using static variables to count
firmware stat events. Taking num_vdev as an example, if for whatever reason (
say ar->num_started_vdevs is 0 or firmware bug etc.) the following condition
(++num_vdev) == total_vdevs_started
is not met, is_end is not set thus num_vdev won't be cleared. Next time when
firmware stats is requested again, even if everything is working fine, we will
fail due to the condition above will never be satisfied.
The same applies to num_bcn as well.
Change to use non-static counters so that we have a chance to clear them each
time firmware stats is requested. Currently only ath11k_fw_stats_request() and
ath11k_debugfs_fw_stats_request() are requesting firmware stats, so clear
counters there.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
Fixes: da3a9d3c1576 ("ath11k: refactor debugfs code into debugfs.c")
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Acked-by: Kalle Valo <kvalo@kernel.org>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250220082448.31039-3-quic_bqiang@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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We get report [1] that CPU is running a hot loop in
ath11k_debugfs_fw_stats_request():
94.60% 0.00% i3status [kernel.kallsyms] [k] do_syscall_64
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--94.60%--do_syscall_64
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--94.55%--__sys_sendmsg
___sys_sendmsg
____sys_sendmsg
netlink_sendmsg
netlink_unicast
genl_rcv
netlink_rcv_skb
genl_rcv_msg
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--94.55%--genl_family_rcv_msg_dumpit
__netlink_dump_start
netlink_dump
genl_dumpit
nl80211_dump_station
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--94.55%--ieee80211_dump_station
sta_set_sinfo
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--94.55%--ath11k_mac_op_sta_statistics
ath11k_debugfs_get_fw_stats
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--94.55%--ath11k_debugfs_fw_stats_request
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|--41.73%--_raw_spin_lock_bh
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|--22.74%--__local_bh_enable_ip
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|--9.22%--_raw_spin_unlock_bh
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--6.66%--srso_alias_safe_ret
This is because, if for whatever reason ar->fw_stats_done is not set by
ath11k_update_stats_event(), ath11k_debugfs_fw_stats_request() won't yield
CPU before an up to 3s timeout.
Change to completion mechanism to avoid CPU burning.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.37
Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
Reported-by: Yury Vostrikov <mon@unformed.ru>
Closes: https://lore.kernel.org/all/7324ac7a-8b7a-42a5-aa19-de52138ff638@app.fastmail.com/ # [1]
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Reviewed-by: Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@oss.qualcomm.com>
Link: https://patch.msgid.link/20250220082448.31039-2-quic_bqiang@quicinc.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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the wil6210 driver irq handling code is unconditionally writing
edma irq registers which are supposed to be only used on Talyn chipsets.
This however leade to a chipset hang on the older sparrow chipset
generation and firmware will not even boot.
Fix that by simply checking for edma support before handling these
registers.
Tested on Netgear R9000
Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Link: https://patch.msgid.link/20250304012131.25970-2-s.gottschall@dd-wrt.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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In some scenarios, the firmware may be stopped before the interface is
removed, either due to a crash or because the remoteproc (e.g., MPSS)
is shut down early during system reboot or shutdown.
This leads to a delay during interface teardown, as the driver waits for
a vdev delete response that never arrives, eventually timing out.
Example (SNOC):
$ echo stop > /sys/class/remoteproc/remoteproc0/state
[ 71.64] remoteproc remoteproc0: stopped remote processor modem
$ reboot
[ 74.84] ath10k_snoc c800000.wifi: failed to transmit packet, dropping: -108
[ 74.84] ath10k_snoc c800000.wifi: failed to submit frame: -108
[...]
[ 82.39] ath10k_snoc c800000.wifi: Timeout in receiving vdev delete response
To avoid this, skip waiting for the vdev delete response if the firmware is
already marked as unreachable (`ATH10K_FLAG_CRASH_FLUSH`), similar to how
`ath10k_mac_wait_tx_complete()` and `ath10k_vdev_setup_sync()` handle this case.
Signed-off-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
Link: https://patch.msgid.link/20250522131704.612206-1-loic.poulain@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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In ath10k_snoc_hif_stop() we skip disabling the IRQs in the crash
recovery flow, but we still unconditionally call enable again in
ath10k_snoc_hif_start().
We can't check the ATH10K_FLAG_CRASH_FLUSH bit since it is cleared
before hif_start() is called, so instead check the
ATH10K_SNOC_FLAG_RECOVERY flag and skip enabling the IRQs during crash
recovery.
This fixes unbalanced IRQ enable splats that happen after recovering from
a crash.
Fixes: 0e622f67e041 ("ath10k: add support for WCN3990 firmware crash recovery")
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Tested-by: Loic Poulain <loic.poulain@oss.qualcomm.com>
Link: https://patch.msgid.link/20250318205043.1043148-1-caleb.connolly@linaro.org
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
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Running sparse on trace_events_filter.c triggered several warnings about
file->filter being accessed directly even though it's annotated with __rcu.
Add rcu_dereference() around it and shuffle the logic slightly so that
it's always referenced via accessor functions.
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250607102821.6c7effbf@gandalf.local.home
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs
Pull JFFS2 and UBIFS fixes from Richard Weinberger:
"JFFS2:
- Correctly check return code of jffs2_prealloc_raw_node_refs()
UBIFS:
- Spelling fixes"
* tag 'ubifs-for-linus-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs:
jffs2: check jffs2_prealloc_raw_node_refs() result in few other places
jffs2: check that raw node were preallocated before writing summary
ubifs: Fix grammar in error message
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kbuild reports the following warning:
arch/sh/kernel/kprobes.c: In function 'kprobe_exceptions_notify':
>> arch/sh/kernel/kprobes.c:412:24: warning: variable 'p' set but not used [-Wunused-but-set-variable]
412 | struct kprobe *p = NULL;
| ^
The variable 'p' is indeed unused since the commit fa5a24b16f94
("sh/kprobes: Don't call the ->break_handler() in SH kprobes code")
Remove that variable along with 'kprobe_opcode_t *addr' which also
becomes unused after 'p' is removed.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202505151341.EuRFR22l-lkp@intel.com/
Fixes: fa5a24b16f94 ("sh/kprobes: Don't call the ->break_handler() in SH kprobes code")
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
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Commit cf9e4784f3bde3e4 ("spi: sh-msiof: Add slave mode support") added
a new mode member to the sh_msiof_spi_info structure, but did not update
any board files. Hence all users in board files rely on the default
being host mode.
Make this unambiguous by configuring host mode explicitly.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
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While the GCC and Clang compilers already define __ASSEMBLER__
automatically when compiling assembly code, __ASSEMBLY__ is a
macro that only gets defined by the Makefiles in the kernel.
This can be very confusing when switching between userspace
and kernelspace coding, or when dealing with uapi headers that
rather should use __ASSEMBLER__ instead. So let's standardize on
the __ASSEMBLER__ macro that is provided by the compilers now.
This is a completely mechanical patch (done with a simple "sed -i"
statement).
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: linux-sh@vger.kernel.org
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
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Revert commit 70523f335734 ("Revert "x86/smp: Eliminate
mwait_play_dead_cpuid_hint()"") to reapply the changes from commit
96040f7273e2 ("x86/smp: Eliminate mwait_play_dead_cpuid_hint()")
reverted by it.
Previously, these changes caused idle power to rise on systems booting
with "nosmt" in the kernel command line because they effectively caused
"dead" SMT siblings to remain in idle state C1 after executing the HLT
instruction, which prevented the processor from reaching package idle
states deeper than PC2 going forward.
Now, the "dead" SMT siblings are rescanned after initializing a proper
cpuidle driver for the processor (either intel_idle or ACPI idle), at
which point they are able to enter a sufficiently deep idle state
in native_play_dead() via cpuidle, so the code changes in question can
be reapplied.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Link: https://patch.msgid.link/7813065.EvYhyI6sBW@rjwysocki.net
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Make acpi_processor_driver_init() call arch_cpu_rescan_dead_smt_siblings(),
via a new wrapper function called acpi_idle_rescan_dead_smt_siblings(),
after successfully initializing the driver, to allow the "dead" SMT
siblings to go into deep idle states, which is necessary for the
processor to be able to reach deep package C-states (like PC10) going
forward, so that power can be reduced sufficiently in suspend-to-idle,
among other things.
However, do it only if the ACPI idle driver is the current cpuidle
driver (otherwise it is assumed that another cpuidle driver will take
care of this) and avoid doing it on architectures other than x86.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Link: https://patch.msgid.link/2005721.PYKUYFuaPT@rjwysocki.net
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Make intel_idle_init() call arch_cpu_rescan_dead_smt_siblings() after
successfully registering intel_idle as the cpuidle driver so as to
allow the "dead" SMT siblings (if any) to go into deep idle states.
This is necessary for the processor to be able to reach deep package
C-states (like PC10) going forward which is requisite for reducing
power sufficiently in suspend-to-idle, among other things.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Link: https://patch.msgid.link/10669885.nUPlyArG6x@rjwysocki.net
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Move the inner part of the arch_resume_nosmt() code into a separate
function called arch_cpu_rescan_dead_smt_siblings(), so it can be
used in other places where "dead" SMT siblings may need to be taken
online and offline again in order to get into deep idle states.
No intentional functional impact.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Link: https://patch.msgid.link/3361688.44csPzL39Z@rjwysocki.net
[ rjw: Prevent build issues with CONFIG_SMP unset ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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|
Enumeration constants read from a symbol reference file can incorrectly
affect new enumeration constants parsed from an actual input file.
Example:
$ cat test.c
enum { E_A, E_B, E_MAX };
struct bar { int mem[E_MAX]; };
int foo(struct bar *a) {}
__GENKSYMS_EXPORT_SYMBOL(foo);
$ cat test.c | ./scripts/genksyms/genksyms -T test.0.symtypes
#SYMVER foo 0x070d854d
$ cat test.0.symtypes
E#E_MAX 2
s#bar struct bar { int mem [ E#E_MAX ] ; }
foo int foo ( s#bar * )
$ cat test.c | ./scripts/genksyms/genksyms -T test.1.symtypes -r test.0.symtypes
<stdin>:4: warning: foo: modversion changed because of changes in enum constant E_MAX
#SYMVER foo 0x9c9dfd81
$ cat test.1.symtypes
E#E_MAX ( 2 ) + 3
s#bar struct bar { int mem [ E#E_MAX ] ; }
foo int foo ( s#bar * )
The __add_symbol() function includes logic to handle the incrementation of
enumeration values, but this code is also invoked when reading a reference
file. As a result, the variables last_enum_expr and enum_counter might be
incorrectly set after reading the reference file, which later affects
parsing of the actual input.
Fix the problem by splitting the logic for the incrementation of
enumeration values into a separate function process_enum() and call it from
__add_symbol() only when processing non-reference data.
Fixes: e37ddb825003 ("genksyms: Track changes to enum constants")
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
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|
The extra-y syntax is deprecated. Instead, use always-$(KBUILD_BUILTIN),
which behaves equivalently.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
|
|
Ensure that propagation settings can only be changed for mounts located
in the caller's mount namespace. This change aligns permission checking
with the rest of mount(2).
Reviewed-by: Christian Brauner <brauner@kernel.org>
Fixes: 07b20889e305 ("beginning of the shared-subtree proper")
Reported-by: "Orlando, Noah" <Noah.Orlando@deshaw.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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KBUILD_BUILTIN is set to 1 unless you are building only modules.
KBUILD_MODULES is set to 1 when you are building only modules
(a typical use case is "make modules").
It is more useful to set them to 'y' instead, so we can do
something like:
always-$(KBUILD_BUILTIN) += vmlinux.lds
This works equivalently to:
extra-y += vmlinux.lds
This allows us to deprecate extra-y. extra-y and always-y are quite
similar, and we do not need both.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
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What we want is to verify there is that clone won't expose something
hidden by a mount we wouldn't be able to undo. "Wouldn't be able to undo"
may be a result of MNT_LOCKED on a child, but it may also come from
lacking admin rights in the userns of the namespace mount belongs to.
clone_private_mnt() checks the former, but not the latter.
There's a number of rather confusing CAP_SYS_ADMIN checks in various
userns during the mount, especially with the new mount API; they serve
different purposes and in case of clone_private_mnt() they usually,
but not always end up covering the missing check mentioned above.
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reported-by: "Orlando, Noah" <Noah.Orlando@deshaw.com>
Fixes: 427215d85e8d ("ovl: prevent private clone if bind mount is not allowed")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull more MM updates from Andrew Morton:
"The series 'Fix uprobe pte be overwritten when expanding vma' fixes a
longstanding and quite obscure bug related to the vma merging of the
uprobe mmap page"
* tag 'mm-stable-2025-06-06-16-09' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
selftests/mm: add test about uprobe pte be orphan during vma merge
selftests/mm: extract read_sysfs and write_sysfs into vm_util
mm: expose abnormal new_pte during move_ptes
mm: fix uprobe pte be overwritten when expanding vma
mm/damon: s/primitives/code/ on comments
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git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"13 hotfixes.
6 are cc:stable and the remainder address post-6.15 issues or aren't
considered necessary for -stable kernels. 11 are for MM"
* tag 'mm-hotfixes-stable-2025-06-06-16-02' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
kernel/rcu/tree_stall: add /sys/kernel/rcu_stall_count
MAINTAINERS: add mm swap section
kmsan: test: add module description
MAINTAINERS: add tlb trace events to MMU GATHER AND TLB INVALIDATION
mm/hugetlb: fix huge_pmd_unshare() vs GUP-fast race
mm/hugetlb: unshare page tables during VMA split, not before
MAINTAINERS: add Alistair as reviewer of mm memory policy
iov_iter: use iov_offset for length calculation in iov_iter_aligned_bvec
mm/mempolicy: fix incorrect freeing of wi_kobj
alloc_tag: handle module codetag load errors as module load failures
mm/madvise: handle madvise_lock() failure during race unwinding
mm: fix vmstat after removing NR_BOUNCE
KVM: s390: rename PROT_NONE to PROT_TYPE_DUMMY
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|
Make sure that detached trees don't receive mount propagation.
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
|
... and fix the breakage in anon-to-anon case. There are two cases
acceptable for do_move_mount() and mixing checks for those is making
things hard to follow.
One case is move of a subtree in caller's namespace.
* source and destination must be in caller's namespace
* source must be detachable from parent
Another is moving the entire anon namespace elsewhere
* source must be the root of anon namespace
* target must either in caller's namespace or in a suitable
anon namespace (see may_use_mount() for details).
* target must not be in the same namespace as source.
It's really easier to follow if tests are *not* mixed together...
Reviewed-by: Christian Brauner <brauner@kernel.org>
Fixes: 3b5260d12b1f ("Don't propagate mounts into detached trees")
Reported-by: Allison Karlitskaya <lis@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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|
Mounting overlayfs with a directory on real rootfs (initramfs)
as upperdir has failed with following message since commit
db04662e2f4f ("fs: allow detached mounts in clone_private_mount()").
[ 4.080134] overlayfs: failed to clone upperpath
Overlayfs mount uses clone_private_mount() to create internal mount
for the underlying layers.
The commit made clone_private_mount() reject real rootfs because
it does not have a parent mount and is in the initial mount namespace,
that is not an anonymous mount namespace.
This issue can be fixed by modifying the permission check
of clone_private_mount() following [1].
Reviewed-by: Christian Brauner <brauner@kernel.org>
Fixes: db04662e2f4f ("fs: allow detached mounts in clone_private_mount()")
Link: https://lore.kernel.org/all/20250514190252.GQ2023217@ZenIV/ [1]
Link: https://lore.kernel.org/all/20250506194849.GT2023217@ZenIV/
Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Kazuma Kondo <kazuma-kondo@nec.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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|
9ffb14ef61ba "move_mount: allow to add a mount into an existing group"
breaks assertions on ->mnt_share/->mnt_slave. For once, the data structures
in question are actually documented.
Documentation/filesystem/sharedsubtree.rst:
All vfsmounts in a peer group have the same ->mnt_master. If it is
non-NULL, they form a contiguous (ordered) segment of slave list.
do_set_group() puts a mount into the same place in propagation graph
as the old one. As the result, if old mount gets events from somewhere
and is not a pure event sink, new one needs to be placed next to the
old one in the slave list the old one's on. If it is a pure event
sink, we only need to make sure the new one doesn't end up in the
middle of some peer group.
"move_mount: allow to add a mount into an existing group" ends up putting
the new one in the beginning of list; that's definitely not going to be
in the middle of anything, so that's fine for case when old is not marked
shared. In case when old one _is_ marked shared (i.e. is not a pure event
sink), that breaks the assumptions of propagation graph iterators.
Put the new mount next to the old one on the list - that does the right thing
in "old is marked shared" case and is just as correct as the current behaviour
if old is not marked shared (kudos to Pavel for pointing that out - my original
suggested fix changed behaviour in the "nor marked" case, which complicated
things for no good reason).
Reviewed-by: Christian Brauner <brauner@kernel.org>
Fixes: 9ffb14ef61ba ("move_mount: allow to add a mount into an existing group")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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|
Intention for MNT_LOCKED had always been to protect the internal
mountpoints within a subtree that got copied across the userns boundary,
not the mountpoint that tree got attached to - after all, it _was_
exposed before the copying.
For roots of secondary copies that is enforced in attach_recursive_mnt() -
MNT_LOCKED is explicitly stripped for those. For the root of primary
copy we are almost always guaranteed that MNT_LOCKED won't be there,
so attach_recursive_mnt() doesn't bother. Unfortunately, one call
chain got overlooked - triggering e.g. NFS referral will have the
submount inherit the public flags from parent; that's fine for such
things as read-only, nosuid, etc., but not for MNT_LOCKED.
This is particularly pointless since the mount attached by finish_automount()
is usually expirable, which makes any protection granted by MNT_LOCKED
null and void; just wait for a while and that mount will go away on its own.
Include MNT_LOCKED into the set of flags to be ignored by do_add_mount() - it
really is an internal flag.
Reviewed-by: Christian Brauner <brauner@kernel.org>
Fixes: 5ff9d8a65ce8 ("vfs: Lock in place mounts from more privileged users")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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|
Holding namespace_sem is enough to make sure that result remains valid.
It is *not* enough to avoid false negatives from __lookup_mnt(). Mounts
can be unhashed outside of namespace_sem (stuck children getting detached
on final mntput() of lazy-umounted mount) and having an unrelated mount
removed from the hash chain while we traverse it may end up with false
negative from __lookup_mnt(). We need to sample and recheck the seqlock
component of mount_lock...
Bug predates the introduction of path_overmount() - it had come from
the code in finish_automount() that got abstracted into that helper.
Reviewed-by: Christian Brauner <brauner@kernel.org>
Fixes: 26df6034fdb2 ("fix automount/automount race properly")
Fixes: 6ac392815628 ("fs: allow to mount beneath top mount")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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|
may_decode_fh() is calling has_locked_children() while holding no locks.
That's an oopsable race...
The rest of the callers are safe since they are holding namespace_sem and
are guaranteed a positive refcount on the mount in question.
Rename the current has_locked_children() to __has_locked_children(), make
it static and switch the fs/namespace.c users to it.
Make has_locked_children() a wrapper for __has_locked_children(), calling
the latter under read_seqlock_excl(&mount_lock).
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Fixes: 620c266f3949 ("fhandle: relax open_by_handle_at() permission checks")
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
|
|
Without correct unregisteration, ACPI notify handlers and the platform
drivers installed by generic_subdriver_init() will become dangling
references after removing the loongson_laptop module, triggering various
kernel faults when a hotkey is sent or at kernel shutdown.
Cc: stable@vger.kernel.org
Fixes: 6246ed09111f ("LoongArch: Add ACPI-based generic laptop driver")
Signed-off-by: Yao Zi <ziyao@disroot.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
|
|
loongson_laptop_turn_{on,off}_backlight() are designed for controlling
the power of the backlight, but they aren't really used in the driver
previously.
Unify these two functions since they only differ in arguments passed to
ACPI method, and wire up loongson_laptop_backlight_update() to update
the power state of the backlight as well. Tested on the TongFang L860-T2
Loongson-3A5000 laptop.
Cc: stable@vger.kernel.org
Fixes: 6246ed09111f ("LoongArch: Add ACPI-based generic laptop driver")
Signed-off-by: Yao Zi <ziyao@disroot.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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|
Pull SCSI fixes from James Bottomley:
"Mostly trivial updates and bug fixes (core update is a comment
spelling fix).
The bigger UFS update is the clock scaling and frequency fixes"
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: ufs: qcom: Prevent calling phy_exit() before phy_init()
scsi: ufs: qcom: Call ufs_qcom_cfg_timers() in clock scaling path
scsi: ufs: qcom: Map devfreq OPP freq to UniPro Core Clock freq
scsi: ufs: qcom: Check gear against max gear in vop freq_to_gear()
scsi: aacraid: Remove useless code
scsi: core: devinfo: Fix typo in comment
scsi: ufs: core: Don't perform UFS clkscaling during host async scan
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|
git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V updates from Palmer Dabbelt:
- Support for the FWFT SBI extension, which is part of SBI 3.0 and a
dependency for many new SBI and ISA extensions
- Support for getrandom() in the VDSO
- Support for mseal
- Optimized routines for raid6 syndrome and recovery calculations
- kexec_file() supports loading Image-formatted kernel binaries
- Improvements to the instruction patching framework to allow for
atomic instruction patching, along with rules as to how systems need
to behave in order to function correctly
- Support for a handful of new ISA extensions: Svinval, Zicbop, Zabha,
some SiFive vendor extensions
- Various fixes and cleanups, including: misaligned access handling,
perf symbol mangling, module loading, PUD THPs, and improved uaccess
routines
* tag 'riscv-for-linus-6.16-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (69 commits)
riscv: uaccess: Only restore the CSR_STATUS SUM bit
RISC-V: vDSO: Wire up getrandom() vDSO implementation
riscv: enable mseal sysmap for RV64
raid6: Add RISC-V SIMD syndrome and recovery calculations
riscv: mm: Add support for Svinval extension
RISC-V: Documentation: Add enough title underlines to CMODX
riscv: Improve Kconfig help for RISCV_ISA_V_PREEMPTIVE
MAINTAINERS: Update Atish's email address
riscv: uaccess: do not do misaligned accesses in get/put_user()
riscv: process: use unsigned int instead of unsigned long for put_user()
riscv: make unsafe user copy routines use existing assembly routines
riscv: hwprobe: export Zabha extension
riscv: Make regs_irqs_disabled() more clear
perf symbols: Ignore mapping symbols on riscv
RISC-V: Kconfig: Fix help text of CMDLINE_EXTEND
riscv: module: Optimize PLT/GOT entry counting
riscv: Add support for PUD THP
riscv: xchg: Prefetch the destination word for sc.w
riscv: Add ARCH_HAS_PREFETCH[W] support with Zicbop
riscv: Add support for Zicbop
...
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull more s390 updates from Heiko Carstens:
- Add missing select CRYPTO_ENGINE to CRYPTO_PAES_S390
- Fix secure storage access exception handling when fault handling is
disabled
* tag 's390-6.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/mm: Fix in_atomic() handling in do_secure_storage_access()
s390/crypto: Select crypto engine in Kconfig when PAES is chosen
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|
Pull tomoyo update from Tetsuo Handa:
"Update mailing list address"
* tag 'tomoyo-pr-20250606' of git://git.code.sf.net/p/tomoyo/tomoyo:
tomoyo: update mailing lists
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|
Pull ceph updates from Ilya Dryomov:
- a one-liner that leads to a startling (but also very much rational)
performance improvement in cases where an IMA policy with rules that
are based on fsmagic matching is enforced
- an encryption-related fixup that addresses generic/397 and other
fstest failures
- a couple of cleanups in CephFS
* tag 'ceph-for-6.16-rc1' of https://github.com/ceph/ceph-client:
ceph: fix variable dereferenced before check in ceph_umount_begin()
ceph: set superblock s_magic for IMA fsmagic matching
ceph: cleanup hardcoded constants of file handle size
ceph: fix possible integer overflow in ceph_zero_objects()
ceph: avoid kernel BUG for encrypted inode with unaligned file size
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|
git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs
Pull overlayfs update from Miklos Szeredi:
- Fix a regression in getting the path of an open file (e.g. in
/proc/PID/maps) for a nested overlayfs setup (André Almeida)
- Support data-only layers and verity in a user namespace (unprivileged
composefs use case)
- Fix a gcc warning (Kees)
- Cleanups
* tag 'ovl-update-v2-6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs:
ovl: Annotate struct ovl_entry with __counted_by()
ovl: Replace offsetof() with struct_size() in ovl_stack_free()
ovl: Replace offsetof() with struct_size() in ovl_cache_entry_new()
ovl: Check for NULL d_inode() in ovl_dentry_upper()
ovl: Use str_on_off() helper in ovl_show_options()
ovl: don't require "metacopy=on" for "verity"
ovl: relax redirect/metacopy requirements for lower -> data redirect
ovl: make redirect/metacopy rejection consistent
ovl: Fix nested backing file paths
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|
The events clock_enable, clock_disable, and clock_set_rate were added back
in 2010. In 2011 they were used by the arm architecture but removed in
2013. These events add around 7K of memory which was wasted for the last 12
years.
Remove them.
Link: https://lore.kernel.org/all/20250529130138.544ffec4@gandalf.local.home/
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kajetan Puchalski <kajetan.puchalski@arm.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/20250605162106.1a459dad@gandalf.local.home
Fixes: 74704ac6ea402 ("tracing, perf: Add more power related events")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
|
|
Enlarge the critical section in ring_buffer_subbuf_order_set() to
ensure that error handling takes place with per-buffer mutex held,
thus preventing list corruption and other concurrency-related issues.
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Link: https://lore.kernel.org/20250606112242.1510605-1-dmantipov@yandex.ru
Reported-by: syzbot+05d673e83ec640f0ced9@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=05d673e83ec640f0ced9
Fixes: f9b94daa542a8 ("ring-buffer: Set new size of the ring buffer sub page")
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
|
|
When faultable trace events were added, a trace event may no longer use
normal RCU to synchronize but instead used synchronize_rcu_tasks_trace().
This synchronization takes a much longer time to synchronize.
The filter logic would free the filters by calling
tracepoint_synchronize_unregister() after it unhooked the filter strings
and before freeing them. With this function now calling
synchronize_rcu_tasks_trace() this increased the time to free a filter
tremendously. On a PREEMPT_RT system, it was even more noticeable.
# time trace-cmd record -p function sleep 1
[..]
real 2m29.052s
user 0m0.244s
sys 0m20.136s
As trace-cmd would clear out all the filters before recording, it could
take up to 2 minutes to do a recording of "sleep 1".
To find out where the issues was:
~# trace-cmd sqlhist -e -n sched_stack select start.prev_state as state, end.next_comm as comm, TIMESTAMP_DELTA_USECS as delta, start.STACKTRACE as stack from sched_switch as start join sched_switch as end on start.prev_pid = end.next_pid
Which will produce the following commands (and -e will also execute them):
echo 's:sched_stack s64 state; char comm[16]; u64 delta; unsigned long stack[];' >> /sys/kernel/tracing/dynamic_events
echo 'hist:keys=prev_pid:__arg_18057_2=prev_state,__arg_18057_4=common_timestamp.usecs,__arg_18057_7=common_stacktrace' >> /sys/kernel/tracing/events/sched/sched_switch/trigger
echo 'hist:keys=next_pid:__state_18057_1=$__arg_18057_2,__comm_18057_3=next_comm,__delta_18057_5=common_timestamp.usecs-$__arg_18057_4,__stack_18057_6=$__arg_18057_7:onmatch(sched.sched_switch).trace(sched_stack,$__state_18057_1,$__comm_18057_3,$__delta_18057_5,$__stack_18057_6)' >> /sys/kernel/tracing/events/sched/sched_switch/trigger
The above creates a synthetic event that creates a stack trace when a task
schedules out and records it with the time it scheduled back in. Basically
the time a task is off the CPU. It also records the state of the task when
it left the CPU (running, blocked, sleeping, etc). It also saves the comm
of the task as "comm" (needed for the next command).
~# echo 'hist:keys=state,stack.stacktrace:vals=delta:sort=state,delta if comm == "trace-cmd" && state & 3' > /sys/kernel/tracing/events/synthetic/sched_stack/trigger
The above creates a histogram with buckets per state, per stack, and the
value of the total time it was off the CPU for that stack trace. It filters
on tasks with "comm == trace-cmd" and only the sleeping and blocked states
(1 - sleeping, 2 - blocked).
~# trace-cmd record -p function sleep 1
~# cat /sys/kernel/tracing/events/synthetic/sched_stack/hist | tail -18
{ state: 2, stack.stacktrace __schedule+0x1545/0x3700
schedule+0xe2/0x390
schedule_timeout+0x175/0x200
wait_for_completion_state+0x294/0x440
__wait_rcu_gp+0x247/0x4f0
synchronize_rcu_tasks_generic+0x151/0x230
apply_subsystem_event_filter+0xa2b/0x1300
subsystem_filter_write+0x67/0xc0
vfs_write+0x1e2/0xeb0
ksys_write+0xff/0x1d0
do_syscall_64+0x7b/0x420
entry_SYSCALL_64_after_hwframe+0x76/0x7e
} hitcount: 237 delta: 99756288 <<--------------- Delta is 99 seconds!
Totals:
Hits: 525
Entries: 21
Dropped: 0
This shows that this particular trace waited for 99 seconds on
synchronize_rcu_tasks() in apply_subsystem_event_filter().
In fact, there's a lot of places in the filter code that spends a lot of
time waiting for synchronize_rcu_tasks_trace() in order to free the
filters.
Add helper functions that will use call_rcu*() variants to asynchronously
free the filters. This brings the timings back to normal:
# time trace-cmd record -p function sleep 1
[..]
real 0m14.681s
user 0m0.335s
sys 0m28.616s
And the histogram also shows this:
~# cat /sys/kernel/tracing/events/synthetic/sched_stack/hist | tail -21
{ state: 2, stack.stacktrace __schedule+0x1545/0x3700
schedule+0xe2/0x390
schedule_timeout+0x175/0x200
wait_for_completion_state+0x294/0x440
__wait_rcu_gp+0x247/0x4f0
synchronize_rcu_normal+0x3db/0x5c0
tracing_reset_online_cpus+0x8f/0x1e0
tracing_open+0x335/0x440
do_dentry_open+0x4c6/0x17a0
vfs_open+0x82/0x360
path_openat+0x1a36/0x2990
do_filp_open+0x1c5/0x420
do_sys_openat2+0xed/0x180
__x64_sys_openat+0x108/0x1d0
do_syscall_64+0x7b/0x420
} hitcount: 2 delta: 77044
Totals:
Hits: 55
Entries: 28
Dropped: 0
Where the total waiting time of synchronize_rcu_tasks_trace() is 77
milliseconds.
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Andreas Ziegler <ziegler.andreas@siemens.com>
Cc: Felix MOESSBAUER <felix.moessbauer@siemens.com>
Link: https://lore.kernel.org/20250606201936.1e3d09a9@batman.local.home
Reported-by: "Flot, Julien" <julien.flot@siemens.com>
Tested-by: Julien Flot <julien.flot@siemens.com>
Fixes: a363d27cdbc2 ("tracing: Allow system call tracepoints to handle page faults")
Closes: https://lore.kernel.org/all/240017f656631c7dd4017aa93d91f41f653788ea.camel@siemens.com/
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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