Qi Liu bdc5c744c7 drivers/perf: Fix kernel panic when rmmod PMU modules during perf sampling ... When users try to remove PMU modules during perf sampling, kernel panic will happen because the pmu->read() is a NULL pointer here. INFO on HiSilicon hip08 platform as follow: pc : hisi_uncore_pmu_event_update+0x30/0xa4 [hisi_uncore_pmu] lr : hisi_uncore_pmu_read+0x20/0x2c [hisi_uncore_pmu] sp : ffff800010103e90 x29: ffff800010103e90 x28: ffff0027db0c0e40 x27: ffffa29a76f129d8 x26: ffffa29a77ceb000 x25: ffffa29a773a5000 x24: ffffa29a77392000 x23: ffffddffe5943f08 x22: ffff002784285960 x21: ffff002784285800 x20: ffff0027d2e76c80 x19: ffff0027842859e0 x18: ffff80003498bcc8 x17: ffffa29a76afe910 x16: ffffa29a7583f530 x15: 16151a1512061a1e x14: 0000000000000000 x13: ffffa29a76f1e238 x12: 0000000000000001 x11: 0000000000000400 x10: 00000000000009f0 x9 : ffff8000107b3e70 x8 : ffff0027db0c1890 x7 : ffffa29a773a7000 x6 : 00000007f5131013 x5 : 00000007f5131013 x4 : 09f257d417c00000 x3 : 00000002187bd7ce x2 : ffffa29a38f0f0d8 x1 : ffffa29a38eae268 x0 : ffff0027d2e76c80 Call trace: hisi_uncore_pmu_event_update+0x30/0xa4 [hisi_uncore_pmu] hisi_uncore_pmu_read+0x20/0x2c [hisi_uncore_pmu] __perf_event_read+0x1a0/0x1f8 flush_smp_call_function_queue+0xa0/0x160 generic_smp_call_function_single_interrupt+0x18/0x20 handle_IPI+0x31c/0x4dc gic_handle_irq+0x2c8/0x310 el1_irq+0xcc/0x180 arch_cpu_idle+0x4c/0x20c default_idle_call+0x20/0x30 do_idle+0x1b4/0x270 cpu_startup_entry+0x28/0x30 secondary_start_kernel+0x1a4/0x1fc To solve the above issue, current module should be registered to kernel, so that try_module_get() can be invoked when perf sampling starts. This adds the reference counting of module and could prevent users from removing modules during sampling. Reported-by: Haifeng Wang <wang.wanghaifeng@huawei.com> Signed-off-by: Qi Liu <liuqi115@huawei.com> Reviewed-by: John Garry <john.garry@huawei.com> Link: https://lore.kernel.org/r/1594891165-8228-1-git-send-email-liuqi115@huawei.com Signed-off-by: Will Deacon <will@kernel.org>		2020-07-16 11:35:24 +01:00
..
accessibility	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
acpi	libnvdimm for 5.8	2020-06-13 13:04:36 -07:00
amba
android	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
ata	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
atm	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
auxdisplay	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
base	linux-kselftest-kunit-5.8-rc1	2020-06-09 10:04:47 -07:00
bcma
block	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
bluetooth
bus
cdrom	Merge branch 'work.sysctl' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-06-10 16:05:54 -07:00
char	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
clk	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
clocksource	arm64: arch_timer: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040	2020-07-08 21:57:51 +01:00
connector	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
counter
cpufreq	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
cpuidle	- Add the hwmon support on the i.MX SC (Anson Huang)	2020-06-12 14:10:21 -07:00
crypto	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-06-13 16:27:13 -07:00
dax
dca
devfreq
dio
dma	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
dma-buf	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
edac	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
eisa	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
extcon
firewire
firmware	efi/libstub/arm64: Retain 2MB kernel Image alignment if !KASLR	2020-07-13 14:08:07 +01:00
fpga
fsi	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
gnss	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
gpio	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
gpu	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
greybus	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
hid	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
hsi	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
hv
hwmon	Merge branch 'x86/entry' into ras/core	2020-06-11 15:17:57 +02:00
hwspinlock
hwtracing
i2c	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
i3c
ide	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
idle
iio	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
infiniband	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
input	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
interconnect	More power management updates for 5.8-rc1	2020-06-10 14:04:39 -07:00
iommu	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
ipack	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
irqchip	clocksource/drivers/timer-riscv: Use per-CPU timer interrupt	2020-06-09 19:11:22 -07:00
isdn	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
leds
lightnvm
macintosh	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
mailbox	mailbox: qcom: Add ipq6018 apcs compatible	2020-06-10 22:43:57 -05:00
mcb
md	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
media	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
memory
memstick
message	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
mfd	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
misc	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
mmc	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
most
mtd	This pull request contains a single change for UBI:	2020-06-10 13:24:40 -07:00
mux
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-06-13 16:27:13 -07:00
nfc	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
ntb
nubus
nvdimm	libnvdimm for 5.8	2020-06-13 13:04:36 -07:00
nvme	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
nvmem
of
opp	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
oprofile	mmap locking API: convert mmap_sem comments	2020-06-09 09:39:14 -07:00
parisc
parport	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
pci	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
pcmcia	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
perf	drivers/perf: Fix kernel panic when rmmod PMU modules during perf sampling	2020-07-16 11:35:24 +01:00
phy
pinctrl
platform	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
pnp	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
power	power supply and reset changes for the v5.8 series	2020-06-10 11:28:35 -07:00
powercap	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
pps	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
ps3
ptp	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
pwm
rapidio	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
ras
regulator
remoteproc
reset
rpmsg
rtc
s390
sbus	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
scsi	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
sfi	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
sh
siox
slimbus
soc	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
soundwire
spi
spmi
ssb
staging	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
target	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
tc
tee	mmap locking API: use coccinelle to convert mmap_sem rwsem call sites	2020-06-09 09:39:14 -07:00
thermal	- Add the hwmon support on the i.MX SC (Anson Huang)	2020-06-12 14:10:21 -07:00
thunderbolt
tty	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
uio
usb	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
vdpa
vfio	kernel: better document the use_mm/unuse_mm API contract	2020-06-10 19:14:18 -07:00
vhost	Kbuild updates for v5.8 (2nd)	2020-06-13 13:29:16 -07:00
video	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
virt	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
virtio	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
visorbus	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
vlynq
vme	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
w1	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
watchdog	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
xen	The X86 entry, exception and interrupt code rework	2020-06-13 10:05:47 -07:00
zorro	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Kconfig
Makefile