linux/drivers
David Hildenbrand bc58ebd506 hv_balloon: don't check for memhp_auto_online manually
We get the MEM_ONLINE notifier call if memory is added right from the
kernel via add_memory() or later from user space.

Let's get rid of the "ha_waiting" flag - the wait event has an inbuilt
mechanism (->done) for that.  Initialize the wait event only once and
reinitialize before adding memory.  Unconditionally call complete() and
wait_for_completion_timeout().

If there are no waiters, complete() will only increment ->done - which
will be reset by reinit_completion().  If complete() has already been
called, wait_for_completion_timeout() will not wait.

There is still the chance for a small race between concurrent
reinit_completion() and complete().  If complete() wins, we would not wait
- which is tolerable (and the race exists in current code as well).

Note: We only wait for "some" memory to get onlined, which seems to be
      good enough for now.

[akpm@linux-foundation.org: register_memory_notifier() after init_completion(), per David]
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Yumei Huang <yuhuang@redhat.com>
Link: http://lkml.kernel.org/r/20200317104942.11178-6-david@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-07 10:43:40 -07:00
..
accessibility
acpi Additional ACPI updates for 5.7-rc1 2020-04-06 10:35:06 -07:00
amba Revert "amba: Initialize dma_parms for amba devices" 2020-04-01 08:03:28 +02:00
android Merge 5.6-rc7 into char-misc-next 2020-03-23 07:59:38 +01:00
ata ata: make "libata.force" kernel parameter optional 2020-03-26 10:28:20 -06:00
atm .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
auxdisplay Merge 5.6-rc7 into char-misc-next 2020-03-23 07:59:38 +01:00
base drivers/base/memory: store mapping between MMOP_* and string in an array 2020-04-07 10:43:40 -07:00
bcma
block for-5.7/drivers-2020-03-29 2020-03-30 11:43:51 -07:00
bluetooth
bus ARM: driver updates 2020-04-03 15:05:35 -07:00
cdrom
char sysfs: remove redundant __compat_only_sysfs_link_entry_to_kobj fn 2020-04-05 11:34:35 -07:00
clk There's not much to see in the core framework this time around. Instead the 2020-04-05 10:43:32 -07:00
clocksource clocksource/drivers/timer-vf-pit: Add missing parenthesis 2020-04-05 09:24:58 +02:00
connector
counter
cpufreq Additional power management updates for 5.7-rc1 2020-04-06 10:14:39 -07:00
cpuidle ARM: SoC updates 2020-04-03 15:02:35 -07:00
crypto SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
dax
dca
devfreq PM / devfreq: Fix handling dev_pm_qos_remove_request result 2020-03-25 08:35:03 +09:00
dio
dma dmaengine updates for v5.7-rc1 2020-04-02 16:04:42 -07:00
dma-buf
edac Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-30 16:40:08 -07:00
eisa .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
extcon Char/Misc driver patches for 5.7-rc1 2020-04-03 13:22:40 -07:00
firewire
firmware ARM: driver updates 2020-04-03 15:05:35 -07:00
fpga
fsi
gnss
gpio This is the bulk of GPIO development for the v5.7 kernel cycle. 2020-04-04 10:27:00 -07:00
gpu New tracing features: 2020-04-05 10:36:18 -07:00
greybus
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2020-04-01 15:18:42 -07:00
hsi
hv hv_balloon: don't check for memhp_auto_online manually 2020-04-07 10:43:40 -07:00
hwmon Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-30 16:40:08 -07:00
hwspinlock hwspinlock: hwspinlock_internal.h: Replace zero-length array with flexible-array member 2020-03-25 22:30:46 -07:00
hwtracing intel_th: msu: Make stopping the trace optional 2020-03-24 13:45:24 +01:00
i2c Merge branch 'i2c/for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2020-04-02 15:54:13 -07:00
i3c i3c: convert to use i2c_new_client_device() 2020-03-29 10:35:50 +02:00
ide Linux 5.6 2020-03-30 13:31:37 +02:00
idle Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-30 16:40:08 -07:00
iio staging: iio: adc: ad7192: Re-indent enum labels 2020-03-23 11:43:42 +01:00
infiniband RDMA 5.7 pull request 2020-04-01 18:18:18 -07:00
input Driver core patches for 5.7-rc1 2020-03-30 13:59:52 -07:00
interconnect interconnect changes for 5.7 2020-03-20 13:45:25 +01:00
iommu
ipack
irqchip Two reverts addressing regressions of the Xilinx interrupt controller 2020-04-05 11:57:12 -07:00
isdn
leds
lightnvm for-5.7/drivers-2020-03-29 2020-03-30 11:43:51 -07:00
macintosh Char/Misc driver patches for 5.7-rc1 2020-04-03 13:22:40 -07:00
mailbox mailbox: imx: add SCU MU support 2020-03-19 23:04:32 -05:00
mcb
md - Fix excessive bio splitting that caused performance regressions. 2020-04-03 14:44:48 -07:00
media Power management updates for 5.7-rc1 2020-03-30 15:05:01 -07:00
memory ARM: driver updates 2020-04-03 15:05:35 -07:00
memstick
message scsi: message: fusion: Replace zero-length array with flexible-array member 2020-03-26 22:40:47 -04:00
mfd
misc pci-v5.7-changes 2020-04-03 14:25:02 -07:00
mmc MMC core: 2020-03-31 16:13:09 -07:00
most staging: most: move core files out of the staging area 2020-03-24 13:42:44 +01:00
mtd mtd: Convert fallthrough comments into statements 2020-03-30 10:14:54 +02:00
mux
net pci-v5.7-changes 2020-04-03 14:25:02 -07:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-03-25 18:58:11 -07:00
ntb pci-v5.7-changes 2020-04-03 14:25:02 -07:00
nubus
nvdimm block: simplify queue allocation 2020-03-27 10:23:43 -06:00
nvme SCSI misc on 20200402 2020-04-02 17:03:53 -07:00
nvmem nvmem: core: remove nvmem_sysfs_get_groups() 2020-03-25 19:23:49 +01:00
of Devicetree updates for v5.7: 2020-04-02 17:32:52 -07:00
opp
oprofile
parisc
parport
pci powerpc updates for 5.7 2020-04-05 11:12:59 -07:00
pcmcia
perf arm64 updates for 5.7: 2020-03-31 10:05:01 -07:00
phy pci-v5.7-changes 2020-04-03 14:25:02 -07:00
pinctrl This is the bulk of GPIO development for the v5.7 kernel cycle. 2020-04-04 10:27:00 -07:00
platform Additional ACPI updates for 5.7-rc1 2020-04-06 10:35:06 -07:00
pnp
power power supply and reset changes for the v5.7 series 2020-04-05 13:47:57 -07:00
powercap Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-03-30 16:40:08 -07:00
pps
ps3
ptp ptp: Avoid deadlocks in the programmable pin code. 2020-03-30 11:16:38 -07:00
pwm
rapidio
ras
regulator spi/regulator: Updates for v5.7 2020-03-30 14:58:26 -07:00
remoteproc remoteproc/omap: Fix set_load call in omap_rproc_request_timer 2020-04-03 10:47:21 -07:00
reset
rpmsg
rtc RTC for 5.7 2020-04-04 10:38:01 -07:00
s390 s390 updates for the 5.7 merge window 2020-04-04 09:45:50 -07:00
sbus misc: move FLASH_MINOR into miscdevice.h and fix conflicts 2020-03-18 12:27:04 +01:00
scsi pci-v5.7-changes 2020-04-03 14:25:02 -07:00
sfi
sh
siox
slimbus
soc ARM: driver updates 2020-04-03 15:05:35 -07:00
soundwire Char/Misc driver patches for 5.7-rc1 2020-04-03 13:22:40 -07:00
spi sound updates for 5.7-rc1 2020-04-02 15:50:04 -07:00
spmi
ssb
staging Char/Misc driver patches for 5.7-rc1 2020-04-03 13:22:40 -07:00
target SCSI misc on 20200402 2020-04-02 17:03:53 -07:00
tc
tee ARM: driver updates 2020-04-03 15:05:35 -07:00
thermal Additional ACPI updates for 5.7-rc1 2020-04-06 10:35:06 -07:00
thunderbolt Merge 5.6-rc7 into usb-next 2020-03-23 08:04:08 +01:00
tty powerpc updates for 5.7 2020-04-05 11:12:59 -07:00
uio uio: uio_pdrv_genirq: use new devm_uio_register_device() function 2020-03-18 12:34:10 +01:00
usb SCSI misc on 20200402 2020-04-02 17:03:53 -07:00
vfio vfio: Ignore -ENODEV when getting MSI cookie 2020-04-01 13:51:51 -06:00
vhost
video Char/Misc driver patches for 5.7-rc1 2020-04-03 13:22:40 -07:00
virt virt: vbox: Use fallthrough; 2020-03-19 07:41:03 +01:00
virtio virtio-balloon: switch back to OOM handler for VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2020-04-07 10:43:39 -07:00
visorbus
vlynq
vme
w1
watchdog
xen xen: branch for v5.7-rc1 2020-04-03 12:51:46 -07:00
zorro SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
Kconfig New tracing features: 2020-04-05 10:36:18 -07:00
Makefile staging: most: move core files out of the staging area 2020-03-24 13:42:44 +01:00