Tom Murphy 37ec8eb851 iommu/amd: Remove unnecessary locking from AMD iommu driver ... With or without locking it doesn't make sense for two writers to be writing to the same IOVA range at the same time. Even with locking we still have a race condition, whoever gets the lock first, so we still can't be sure what the result will be. With locking the result will be more sane, it will be correct for the last writer, but still useless because we can't be sure which writer will get the lock last. It's a fundamentally broken design to have two writers writing to the same IOVA range at the same time. So we can remove the locking and work on the assumption that no two writers will be writing to the same IOVA range at the same time. The only exception is when we have to allocate a middle page in the page tables, the middle page can cover more than just the IOVA range a writer has been allocated. However this isn't an issue in the AMD driver because it can atomically allocate middle pages using "cmpxchg64()". Signed-off-by: Tom Murphy <murphyt7@tcd.ie> Signed-off-by: Joerg Roedel <jroedel@suse.de>		2019-10-15 11:31:03 +02:00
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accessibility
acpi	Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-09-28 08:14:15 -07:00
amba
android	binder: Fix comment headers on binder_alloc_prepare_to_free()	2019-10-10 14:39:23 +02:00
ata	Revert "libata, freezer: avoid block device removal while system is frozen"	2019-10-06 09:11:37 -06:00
atm
auxdisplay
base	driver core: platform: Add platform_get_irq_byname_optional()	2019-10-07 12:52:44 +02:00
bcma
block	for-linus-20191010	2019-10-11 08:45:32 -07:00
bluetooth
bus	ARM: SoC fixes	2019-09-30 10:04:28 -07:00
cdrom
char	char/random: Add a newline at the end of the file	2019-10-02 13:49:43 -07:00
clk	Fixes for omaps for v5.4-rc cycle	2019-10-03 09:15:19 -07:00
clocksource	timer-of: don't use conditional expression with mixed 'void' types	2019-10-02 16:16:07 -07:00
connector
counter
cpufreq
cpuidle
crypto
dax
dca
devfreq
dio
dma
dma-buf
edac
eisa
extcon
firewire
firmware	Char/Misc driver fixes for 5.4-rc3.	2019-10-12 15:47:19 -07:00
fpga
fsi
gnss
gpio	gpio: max77620: Use correct unit for debounce times	2019-10-04 23:58:10 +02:00
gpu	xen: fixes for 5.4-rc3	2019-10-12 14:11:21 -07:00
greybus
hid	HID: hyperv: Use in-place iterator API in the channel callback	2019-10-01 14:49:41 -04:00
hsi
hv	Drivers: hv: vmbus: Fix harmless building warnings without CONFIG_PM_SLEEP	2019-10-01 14:49:45 -04:00
hwmon	hwmon: (nct7904) Add array fan_alarm and vsen_alarm to store the alarms in nct7904_data struct.	2019-10-02 06:42:48 -07:00
hwspinlock
hwtracing
i2c	i2c: slave-eeprom: Add read only mode	2019-09-28 20:44:12 +02:00
i3c
ide
idle
iio	First set of IIO fixes for the 5.4 cycle.	2019-10-10 11:18:37 +02:00
infiniband	RDMA/mlx5: Add missing synchronize_srcu() for MW cases	2019-10-04 15:54:22 -03:00
input
interconnect
iommu	iommu/amd: Remove unnecessary locking from AMD iommu driver	2019-10-15 11:31:03 +02:00
ipack
irqchip
isdn
leds
lightnvm
macintosh
mailbox
mcb
md
media	media: stkwebcam: fix runtime PM after driver unbind	2019-10-04 14:38:46 +02:00
memory
memstick
message
mfd	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal	2019-09-29 10:24:23 -07:00
misc	misc: fastrpc: prevent memory leak in fastrpc_dma_buf_attach	2019-10-04 18:22:14 +02:00
mmc	mmc: host: sdhci-pci: Add Genesys Logic GL975x support	2019-09-27 20:48:20 +02:00
mtd	mtd: rawnand: au1550nd: Fix au_read_buf16() prototype	2019-10-07 09:56:36 +02:00
mux
net	RDMA subsystem updates for 5.4-rc	2019-10-09 09:46:46 -07:00
nfc	NFC: st95hf: clean up indentation issue	2019-09-27 20:31:18 +02:00
ntb
nubus
nvdimm	libnvdimm fixes v5.4-rc1	2019-09-29 10:33:41 -07:00
nvme	Merge branch 'nvme-5.4' of git://git.infradead.org/nvme into for-linus	2019-09-27 13:17:37 -06:00
nvmem
of	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2019-09-28 17:47:33 -07:00
opp
oprofile
parisc
parport
pci	Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-09-28 08:14:15 -07:00
pcmcia	Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-09-28 08:14:15 -07:00
perf
phy
pinctrl
platform
pnp
power
powercap
pps
ps3
ptp	ptp_qoriq: Initialize the registers' spinlock before calling ptp_qoriq_settime	2019-10-02 12:20:38 -04:00
pwm	pwm: Changes for v5.4-rc1	2019-09-27 12:19:47 -07:00
rapidio
ras
regulator
remoteproc
reset	ARM: SoC fixes	2019-09-30 10:04:28 -07:00
rpmsg
rtc
s390	s390/cio: fix virtio-ccw DMA without PV	2019-10-10 10:49:46 +02:00
sbus
scsi	SCSI fixes on 20191004	2019-10-05 12:53:27 -07:00
sfi
sh
siox
slimbus
soc
soundwire
spi
spmi
ssb
staging	Staging/IIO driver fixes for 5.4-rc3	2019-10-12 15:44:46 -07:00
target
tc
tee
thermal	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal	2019-09-29 10:24:23 -07:00
thunderbolt
tty	tty: serial: imx: Use platform_get_irq_optional() for optional IRQs	2019-10-10 13:12:28 +02:00
uio
usb	USB: yurex: fix NULL-derefs on disconnect	2019-10-10 14:24:06 +02:00
vfio
vhost
video	video/logo: do not generate unneeded logo C files	2019-10-05 15:29:49 +09:00
virt	virt: vbox: fix memory leak in hgcm_call_preprocess_linaddr	2019-10-10 14:50:32 +02:00
virtio
visorbus
vlynq
vme
w1	w1: ds250x: Fix build error without CRC16	2019-10-10 15:35:41 +02:00
watchdog	linux-watchdog 5.4-rc1 tag	2019-09-27 11:17:38 -07:00
xen	xen: fixes for 5.4-rc3	2019-10-12 14:11:21 -07:00
zorro
Kconfig
Makefile