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Jiang Biao 2ce02a864a PCI: Add schedule point in pci_read_config() 
The PCI sysfs "config" file allows large reads, and the resulting PCI
config reads can take several milliseconds to complete.  Testing with the
cyclictest [1] benchmark showed 5ms+ latencies.

Add a schedule point in pci_read_config() to reduce the maximum latency.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/clrkwllms/rt-tests.git/

[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20200824052025.48362-1-benbjiang@tencent.com
Reported-by: Bin Lai <robinlai@tencent.com>
Signed-off-by: Jiang Biao <benbjiang@tencent.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2020-09-17 12:21:46 -05:00
..
accessibility
Merge tag 'tty-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
2020-08-06 14:56:11 -07:00
acpi
PCI/ACPI: Tone down missing MCFG message
2020-09-15 10:54:24 -05:00
amba
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android
drivers: android: Fix the SPDX comment style
2020-07-29 17:05:44 +02:00
ata
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atm
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-08-05 20:13:21 -07:00
auxdisplay
Merge tag 'auxdisplay-for-linus-v5.9-rc1' of git://github.com/ojeda/linux
2020-08-06 18:09:34 -07:00
base
Merge tag 'pm-5.9-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
2020-08-07 13:13:09 -07:00
bcma
bcma: gpio: Use irqchip template
2020-08-02 18:26:51 +03:00
block
Merge tag 'block-5.9-2020-08-14' of git://git.kernel.dk/linux-block
2020-08-15 20:36:42 -07:00
bluetooth
Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next
2020-07-31 15:11:52 -07:00
bus
Merge tag 'mips_5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
2020-08-06 10:54:07 -07:00
cdrom
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char
Merge tag 'v5.8' into drm-next
2020-08-11 11:58:31 +10:00
clk
Merge tag 'acpi-5.9-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
2020-08-15 08:18:22 -07:00
clocksource
Merge tag 'mfd-next-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
2020-08-15 08:09:38 -07:00
connector
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counter
Merge branch 'ib-5.8-tcb' into HEAD
2020-07-22 14:37:23 +01:00
cpufreq
cpufreq: intel_pstate: Implement passive mode with HWP enabled
2020-08-11 17:29:45 +02:00
cpuidle
Merge tag 'powerpc-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2020-08-07 10:33:50 -07:00
crypto
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
2020-08-11 14:34:17 -07:00
dax
Merge tag 'libnvdimm-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2020-08-11 10:59:19 -07:00
dca
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devfreq
PM / devfreq: Fix the wrong end with semicolon
2020-07-30 17:22:58 +09:00
dio
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dma
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 21:14:30 -07:00
dma-buf
Merge tag 'locking-urgent-2020-08-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-08-10 19:07:44 -07:00
edac
Merge tag 'edac_updates_for_5.9_pt2' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras
2020-08-15 08:25:41 -07:00
eisa
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extcon
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firewire
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firmware
uaccess: add force_uaccess_{begin,end} helpers
2020-08-12 10:57:59 -07:00
fpga
Merge 5.8-rc7 into char-misc-next
2020-07-27 11:49:37 +02:00
fsi
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gnss
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gpio
Merge tag 'gpio-v5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
2020-08-05 12:56:27 -07:00
gpu
Merge tag 'pwm/for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
2020-08-14 16:00:09 -07:00
greybus
greybus: Use fallthrough pseudo-keyword
2020-07-29 16:58:08 +02:00
hid
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
2020-08-10 16:33:54 -07:00
hsi
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hv
Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
2020-08-14 13:31:25 -07:00
hwmon
Merge tag 'pwm/for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
2020-08-14 16:00:09 -07:00
hwspinlock
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hwtracing
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i2c
Merge tag 'acpi-5.9-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
2020-08-15 08:18:22 -07:00
i3c
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ide
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idle
Merge tag 'uninit-macro-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
2020-08-04 13:49:43 -07:00
iio
iio: imu: st_lsm6dsx: reset hw ts after resume
2020-07-22 14:55:43 +01:00
infiniband
mm/gup: remove task_struct pointer for all gup code
2020-08-12 10:58:04 -07:00
input
Merge tag 'sh-for-5.9' of git://git.libc.org/linux-sh
2020-08-15 18:50:32 -07:00
interconnect
Merge tag 'char-misc-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
2020-08-05 11:43:47 -07:00
iommu
Merge branch 'akpm' (patches from Andrew)
2020-08-12 11:24:12 -07:00
ipack
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irqchip
Merge tag 'irq-core-2020-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-08-04 18:11:58 -07:00
isdn
mISDN: Don't try to print a sockptr_t from debug logging code.
2020-07-24 16:36:13 -07:00
leds
Merge tag 'leds-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds
2020-08-05 19:24:27 -07:00
lightnvm
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macintosh
Merge tag 'powerpc-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
2020-08-07 10:33:50 -07:00
mailbox
iomap: constify ioreadX() iomem argument (as in generic implementation)
2020-08-14 19:56:57 -07:00
mcb
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md
Merge tag 'block-5.9-2020-08-14' of git://git.kernel.dk/linux-block
2020-08-15 20:36:42 -07:00
media
Merge tag 'iommu-updates-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
2020-08-11 14:13:24 -07:00
memory
Merge tag 'iommu-updates-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
2020-08-11 14:13:24 -07:00
memstick
Merge tag 'mmc-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
2020-08-05 13:23:24 -07:00
message
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mfd
Merge tag 'mfd-next-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
2020-08-15 08:09:38 -07:00
misc
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 21:14:30 -07:00
mmc
Merge tag 'sched-fifo-2020-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-08-06 11:55:43 -07:00
most
drivers: most: add USB adapter driver
2020-07-31 14:38:12 +02:00
mtd
Merge tag 'for-linus-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs
2020-08-10 18:20:04 -07:00
mux
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net
rtl818x: constify ioreadX() iomem argument (as in generic implementation)
2020-08-14 19:56:57 -07:00
nfc
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ntb
ntb: intel: constify ioreadX() iomem argument (as in generic implementation)
2020-08-14 19:56:57 -07:00
nubus
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nvdimm
mm: add thp_size
2020-08-14 19:56:56 -07:00
nvme
Merge tag 'for-5.9/block-merge-20200804' of git://git.kernel.dk/linux-block
2020-08-05 11:12:34 -07:00
nvmem
nvmem: qcom-spmi-sdam: Enable multiple devices
2020-07-29 17:12:09 +02:00
of
Merge tag 'mips_5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
2020-08-06 10:54:07 -07:00
opp
Merge branch 'cpufreq/arm/linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm
2020-08-04 12:44:53 +02:00
oprofile
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parisc
Merge branch 'parisc-5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
2020-08-12 12:41:15 -07:00
parport
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pci
PCI: Add schedule point in pci_read_config()
2020-09-17 12:21:46 -05:00
pcmcia
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perf
Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
2020-08-07 13:35:51 -07:00
phy
Merge tag 'phy-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy into char-misc-next
2020-07-23 09:52:10 +02:00
pinctrl
Merge tag 'pinctrl-v5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
2020-08-09 12:52:28 -07:00
platform
Merge tag 'linux-watchdog-5.9-rc1' of git://www.linux-watchdog.org/linux-watchdog
2020-08-12 12:13:44 -07:00
pnp
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power
Merge tag 'for-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply
2020-08-07 21:27:37 -07:00
powercap
Merge tag 'sched-fifo-2020-08-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2020-08-06 11:55:43 -07:00
pps
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ps3
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ptp
ptp: only allow phase values lower than 1 period
2020-08-05 12:06:44 -07:00
pwm
Merge tag 'pwm/for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
2020-08-14 16:00:09 -07:00
rapidio
rapidio/rio_mport_cdev: use array_size() helper in copy_{from,to}_user()
2020-08-12 10:58:01 -07:00
ras
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regulator
Merge remote-tracking branch 'regulator/for-5.9' into regulator-next
2020-07-30 23:27:08 +01:00
remoteproc
Merge tag 'rproc-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/andersson/remoteproc
2020-08-11 11:17:45 -07:00
reset
Merge tag 'drivers_soc_for_5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone into arm/drivers
2020-07-27 14:24:51 +02:00
rpmsg
rpmsg: virtio: add endianness conversions
2020-07-21 20:37:16 -07:00
rtc
Merge tag 'rtc-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
2020-08-12 17:17:00 -07:00
s390
s390/pkey: remove redundant variable initialization
2020-08-11 18:16:31 +02:00
sbus
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scsi
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
2020-08-14 16:01:59 -07:00
sfi
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sh
iomap: constify ioreadX() iomem argument (as in generic implementation)
2020-08-14 19:56:57 -07:00
siox
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slimbus
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soc
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2020-08-07 21:14:30 -07:00
soundwire
Merge tag 'soundwire-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire into char-misc-next
2020-07-23 09:12:15 +02:00
spi
Merge tag 'sound-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
2020-08-06 14:27:31 -07:00
spmi
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ssb
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
2020-08-05 20:13:21 -07:00
staging
Merge tag 'pci-v5.9-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
2020-08-07 18:48:15 -07:00
target
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
2020-08-14 16:01:59 -07:00
tc
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tee
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thermal
Merge tag 'mfd-next-5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
2020-08-15 08:09:38 -07:00
thunderbolt
thunderbolt: merge fix for kunix_resource changes
2020-08-09 11:06:10 -07:00
tty
Merge tag 'tty-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
2020-08-06 14:56:11 -07:00
uio
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usb
Merge tag 'media/v5.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
2020-08-07 13:00:53 -07:00
vdpa
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
2020-08-11 14:34:17 -07:00
vfio
Merge tag 'vfio-v5.9-rc1' of git://github.com/awilliam/linux-vfio
2020-08-12 12:09:36 -07:00
vhost
Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
2020-08-11 14:34:17 -07:00
video
Merge tag 'pwm/for-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
2020-08-14 16:00:09 -07:00
virt
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virtio
virtio: pci: constify ioreadX() iomem argument (as in generic implementation)
2020-08-14 19:56:57 -07:00
visorbus
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vlynq
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vme
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w1
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watchdog
Merge tag 'linux-watchdog-5.9-rc1' of git://www.linux-watchdog.org/linux-watchdog
2020-08-12 12:13:44 -07:00
xen
Merge tag 'for-linus-5.9-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
2020-08-14 13:34:37 -07:00
zorro
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Kconfig
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Makefile
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