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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
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accessibility
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acpi
PCI/ACPI: Tone down missing MCFG message
2020-09-15 10:54:24 -05:00
amba
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android
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ata
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atm
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auxdisplay
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base
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bcma
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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
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bus
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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
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cpufreq
cpufreq: intel_pstate: Implement passive mode with HWP enabled
2020-08-11 17:29:45 +02:00
cpuidle
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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
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dio
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dma
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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
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fsi
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gnss
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gpio
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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
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hid
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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
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iio
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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
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iommu
Merge branch 'akpm' (patches from Andrew)
2020-08-12 11:24:12 -07:00
ipack
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irqchip
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isdn
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leds
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lightnvm
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macintosh
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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
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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
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mmc
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most
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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
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nvmem
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of
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opp
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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
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phy
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pinctrl
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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
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powercap
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pps
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ps3
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ptp
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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
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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
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rpmsg
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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
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soundwire
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spi
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spmi
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ssb
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staging
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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
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tty
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uio
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usb
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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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