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Chris Wilson 89f077ab90 drm/i915: Mark up unlocked update of i915_request.hwsp_seqno 
During i915_request_retire() we decouple the i915_request.hwsp_seqno
from the intel_timeline so that it may be freed before the request is
released. However, we need to warn the compiler that the pointer may
update under its nose.

[  171.438899] BUG: KCSAN: data-race in i915_request_await_dma_fence [i915] / i915_request_retire [i915]
[  171.438920]
[  171.438932] write to 0xffff8881e7e28ce0 of 8 bytes by task 148 on cpu 2:
[  171.439174]  i915_request_retire+0x1ea/0x660 [i915]
[  171.439408]  retire_requests+0x7a/0xd0 [i915]
[  171.439640]  engine_retire+0xa1/0xe0 [i915]
[  171.439657]  process_one_work+0x3b1/0x690
[  171.439671]  worker_thread+0x80/0x670
[  171.439685]  kthread+0x19a/0x1e0
[  171.439701]  ret_from_fork+0x1f/0x30
[  171.439721]
[  171.439739] read to 0xffff8881e7e28ce0 of 8 bytes by task 696 on cpu 1:
[  171.439990]  i915_request_await_dma_fence+0x162/0x520 [i915]
[  171.440230]  i915_request_await_object+0x2fe/0x470 [i915]
[  171.440467]  i915_gem_do_execbuffer+0x45dc/0x4c20 [i915]
[  171.440704]  i915_gem_execbuffer2_ioctl+0x2c3/0x580 [i915]
[  171.440722]  drm_ioctl_kernel+0xe4/0x120
[  171.440736]  drm_ioctl+0x297/0x4c7
[  171.440750]  ksys_ioctl+0x89/0xb0
[  171.440766]  __x64_sys_ioctl+0x42/0x60
[  171.440788]  do_syscall_64+0x6e/0x2c0
[  171.440802]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200309110934.868-1-chris@chris-wilson.co.uk
2020-03-09 18:23:59 +00:00
..
accessibility
…
acpi
ACPI: PM: s2idle: Prevent spurious SCIs from waking up the system
2020-02-11 23:26:15 +01:00
amba
…
android
for-5.6/io_uring-vfs-2020-01-29
2020-01-29 18:53:37 -08:00
ata
libata-5.6-2020-02-05
2020-02-06 06:11:50 +00:00
atm
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-01-28 16:02:33 -08:00
auxdisplay
…
base
ARM: SoC-related driver updates
2020-02-08 14:04:19 -08:00
bcma
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-01-28 16:02:33 -08:00
block
Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-02-08 13:26:41 -08:00
bluetooth
Bluetooth: btrtl: Use kvmalloc for FW allocations
2020-01-24 19:57:53 +01:00
bus
bus: moxtet: fix potential stack buffer overflow
2020-02-15 10:33:19 -08:00
cdrom
…
char
Minor bug fixes for IPMI
2020-02-16 13:05:46 -08:00
clk
ARM: SoC: late updates
2020-02-08 14:17:27 -08:00
clocksource
ARM: SoC: late updates
2020-02-08 14:17:27 -08:00
connector
…
counter
…
cpufreq
Merge branch 'pm-cpufreq'
2020-02-14 10:40:48 +01:00
cpuidle
ARM: SoC-related driver updates
2020-02-08 14:04:19 -08:00
crypto
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-01-28 16:02:33 -08:00
dax
dax: Get rid of fs_dax_get_by_host() helper
2020-01-16 09:52:27 -08:00
dca
…
devfreq
PM / devfreq: Add debugfs support with devfreq_summary file
2020-01-16 19:14:49 +09:00
dio
…
dma
ARM: Device-tree updates
2020-02-08 13:58:44 -08:00
dma-buf
…
edac
EDAC/sysfs: Remove csrow objects on errors
2020-02-13 13:29:41 +01:00
eisa
…
extcon
…
firewire
…
firmware
ARM: SoC-related driver updates
2020-02-08 14:04:19 -08:00
fpga
fpga: xilinx-pr-decoupler: Remove clk_get error message for probe defer
2020-01-10 12:51:56 -08:00
fsi
…
gnss
…
gpio
gpio: sifive: fix static checker warning
2020-02-10 13:54:17 +01:00
gpu
drm/i915: Mark up unlocked update of i915_request.hwsp_seqno
2020-03-09 18:23:59 +00:00
greybus
…
hid
drm pull for 5.6-rc1
2020-01-30 08:04:01 -08:00
hsi
…
hv
- Most of the commits here are work to enable host-initiated hibernation
2020-02-03 14:42:03 +00:00
hwmon
hwmon: (pmbus/xdpe12284) fix typo in compatible strings
2020-02-12 12:43:01 -08:00
hwspinlock
hwspinlock: sirf: Use devm_hwspin_lock_register() to register hwlock controller
2020-01-21 16:16:36 -08:00
hwtracing
coresight: etm4x: Fix unused function warning
2020-01-14 15:38:28 +01:00
i2c
Merge branch 'i2c/for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2020-02-07 12:54:13 -08:00
i3c
i3c: master: dw: reattach device on first available location of address table
2020-01-13 10:00:05 +01:00
ide
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
idle
intel_idle: Introduce 'states_off' module parameter
2020-02-03 11:57:18 +01:00
iio
chrome platform changes for 5.6
2020-02-04 07:17:41 +00:00
infiniband
IB/mlx5: Use div64_u64 for num_var_hw_entries calculation
2020-02-14 15:21:52 -04:00
input
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2020-02-15 16:49:25 -08:00
interconnect
…
iommu
IOMMU Updates for Linux v5.6
2020-02-05 17:49:54 +00:00
ipack
…
irqchip
irqchip/gic-v4.1: Avoid 64bit division for the sake of 32bit ARM
2020-02-09 15:47:37 -08:00
isdn
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
leds
leds: lm3532: add pointer to documentation and fix typo
2020-01-22 21:08:24 +01:00
lightnvm
…
macintosh
powerpc updates for 5.6
2020-02-04 13:06:46 +00:00
mailbox
…
mcb
…
md
block-5.6-2020-02-16
2020-02-16 12:35:52 -08:00
media
chrome platform changes for 5.6
2020-02-04 07:17:41 +00:00
memory
mvebu drivers for 5.6 (part 1)
2020-01-16 10:45:44 -08:00
memstick
…
message
Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net
2020-01-19 22:10:04 +01:00
mfd
chrome platform changes for 5.6
2020-02-04 07:17:41 +00:00
misc
Merge branch 'i2c/for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2020-02-07 12:54:13 -08:00
mmc
ioremap changes for 5.6
2020-01-27 13:03:00 -08:00
mtd
treewide: remove redundant IS_ERR() before error code check
2020-02-04 03:05:27 +00:00
mux
…
net
net: hns3: fix a copying IPv6 address error in hclge_fd_get_flow_tuples()
2020-02-14 07:05:17 -08:00
nfc
Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net
2020-01-19 22:10:04 +01:00
ntb
…
nubus
…
nvdimm
mm: Cleanup __put_devmap_managed_page() vs ->page_free()
2020-01-31 10:30:37 -08:00
nvme
block-5.6-2020-02-16
2020-02-16 12:35:52 -08:00
nvmem
Merge branch 'i2c/for-5.6' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
2020-02-07 12:54:13 -08:00
of
ARM: SoC-related driver updates
2020-02-08 14:04:19 -08:00
opp
ioremap changes for 5.6
2020-01-27 13:03:00 -08:00
oprofile
tracing: Make struct ring_buffer less ambiguous
2020-01-13 13:19:38 -05:00
parisc
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
parport
…
pci
pci-v5.6-fixes-1
2020-02-06 14:17:38 +00:00
pcmcia
…
perf
perf/smmuv3: Use platform_get_irq_optional() for wired interrupt
2020-02-10 18:14:46 +00:00
phy
treewide: remove redundant IS_ERR() before error code check
2020-02-04 03:05:27 +00:00
pinctrl
pinctrl: fix pxa2xx.c build warnings
2020-02-04 03:05:24 +00:00
platform
Merge branch 'akpm' (patches from Andrew)
2020-02-04 07:24:48 +00:00
pnp
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
power
ARM: SoC platform updates
2020-02-08 13:55:25 -08:00
powercap
Merge back power capping changes for v5.6.
2020-01-13 10:32:19 +01:00
pps
…
ps3
…
ptp
Merge ra.kernel.org:/pub/scm/linux/kernel/git/netdev/net
2020-01-19 22:10:04 +01:00
pwm
pwm: Remove set but not set variable 'pwm'
2020-01-20 15:40:49 +01:00
rapidio
…
ras
…
regulator
- New Drivers
2020-02-03 14:51:57 +00:00
remoteproc
remoteproc: qcom: q6v5-mss: Improve readability of reset_assert
2020-01-24 09:34:07 -08:00
reset
Reset controller updates for v5.6
2020-01-10 22:20:37 -08:00
rpmsg
rpmsg: add rpmsg support for mt8183 SCP.
2020-01-20 10:29:56 -08:00
rtc
chrome platform changes for 5.6
2020-02-04 07:17:41 +00:00
s390
fix style of SPDX License Identifier
2020-02-11 20:14:28 +01:00
sbus
…
scsi
SCSI misc on 20200208
2020-02-08 17:24:41 -08:00
sfi
…
sh
…
siox
siox: Use the correct style for SPDX License Identifier
2020-01-14 21:46:53 +01:00
slimbus
slimbus: qcom: add missed clk_disable_unprepare in remove
2020-01-14 21:46:48 +01:00
soc
soc/tegra: fuse: Fix build with Tegra194 configuration
2020-02-11 15:00:15 -08:00
soundwire
soundwire: cadence: fix kernel-doc parameter descriptions
2020-01-16 17:34:38 +05:30
spi
treewide: remove redundant IS_ERR() before error code check
2020-02-04 03:05:27 +00:00
spmi
spmi: pmic-arb: Set lockdep class for hierarchical irq domains
2020-02-10 13:16:04 +01:00
ssb
…
staging
proc: convert everything to "struct proc_ops"
2020-02-04 03:05:26 +00:00
target
SCSI misc on 20200129
2020-01-29 18:16:16 -08:00
tc
The main MIPS changes for 5.6:
2020-01-31 11:28:31 -08:00
tee
ARM: SoC-related driver updates
2020-02-08 14:04:19 -08:00
thermal
- Fix a SEVERE docs build failure for cpu idle cooling device (Randy Dunlap)
2020-01-31 14:39:21 -08:00
thunderbolt
thunderbolt: fix memory leak of object sw
2020-01-14 15:37:41 +01:00
tty
Kbuild updates for v5.6 (2nd)
2020-02-09 16:05:50 -08:00
uio
uio: uio_pdrv_genirq: Do not log an error when deferring probe routine.
2020-01-14 15:27:51 +01:00
usb
Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-02-08 13:26:41 -08:00
vfio
VFIO updates for v5.6-rc1
2020-02-03 22:22:05 +00:00
vhost
…
video
drm-misc-next for 5.7:
2020-02-21 05:44:40 +10:00
virt
…
virtio
virtio_balloon: Fix memory leaks on errors in virtballoon_probe()
2020-02-06 03:40:27 -05:00
visorbus
visorbus: fix uninitialized variable access
2020-01-14 15:30:35 +01:00
vlynq
…
vme
Char/Misc driver changes for 5.6-rc1
2020-01-29 10:35:54 -08:00
w1
Char/Misc driver changes for 5.6-rc1
2020-01-29 10:35:54 -08:00
watchdog
linux-watchdog 5.6-rc1 tag
2020-02-07 12:30:16 -08:00
xen
xen: branch for v5.6-rc1
2020-02-05 17:44:14 +00:00
zorro
Kbuild updates for v5.6 (2nd)
2020-02-09 16:05:50 -08:00
Kconfig
…
Makefile
…