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70f8a3ca68
linux/drivers/misc
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Davidlohr Bueso 70f8a3ca68 mm: make mm->pinned_vm an atomic64 counter 
Taking a sleeping lock to _only_ increment a variable is quite the
overkill, and pretty much all users do this. Furthermore, some drivers
(ie: infiniband and scif) that need pinned semantics can go to quite
some trouble to actually delay via workqueue (un)accounting for pinned
pages when not possible to acquire it.

By making the counter atomic we no longer need to hold the mmap_sem and
can simply some code around it for pinned_vm users. The counter is 64-bit
such that we need not worry about overflows such as rdma user input
controlled from userspace.

Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Christoph Lameter <cl@linux.com>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2019-02-07 12:54:02 -07:00
..
altera-stapl altera-stapl: check for a null key before strcasecmp'ing it 2018-11-27 08:44:07 +01:00
c2port kmemcheck: remove annotations 2017-11-15 18:21:04 -08:00
cardreader misc: alcor_pci: fix spelling mistake "invailid" -> "invalid" 2018-12-17 08:26:24 +01:00
cb710 cb710: Convert to new IDA API 2018-08-21 23:54:18 -04:00
cxl cxl: drop the dma_set_mask callback from vphb 2018-12-20 22:21:20 +11:00
echo misc: echo: Remove unnecessary parentheses and simplify check for zero 2018-09-25 20:21:02 +02:00
eeprom eeprom: at24: add support for 24c2048 2018-12-10 16:23:27 +01:00
genwqe cross-tree: phase out dma_zalloc_coherent() 2019-01-08 07:58:37 -05:00
ibmasm ibmasm: don't write out of bounds in read handler 2018-07-07 09:59:35 +02:00
lis3lv02d vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
lkdtm New gcc plugin: stackleak 2018-11-01 11:46:27 -07:00
mei mei: me: add denverton innovation engine device IDs 2019-01-13 15:45:42 +01:00
mic mm: make mm->pinned_vm an atomic64 counter 2019-02-07 12:54:02 -07:00
ocxl ocxl: Fix endiannes bug in read_afu_name() 2018-12-21 14:46:50 +11:00
sgi-gru mm/mmu_notifier: use structure for invalidate_range_start/end callback 2018-12-28 12:11:50 -08:00
sgi-xp sgi-xp: Replace spin_is_locked() with lockdep 2018-10-15 20:54:17 +02:00
ti-st misc: ti-st: make array read_ver_cmd static, shrinks object size 2018-12-06 15:53:15 +01:00
vmw_vmci Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
ad525x_dpot-i2c.c drivers: misc: ad525x_dpot: Update MODULE AUTHOR email address 2018-09-14 15:36:20 +02:00
ad525x_dpot-spi.c drivers: misc: ad525x_dpot: Update MODULE AUTHOR email address 2018-09-14 15:36:20 +02:00
ad525x_dpot.c drivers: misc: ad525x_dpot: Update MODULE AUTHOR email address 2018-09-14 15:36:20 +02:00
ad525x_dpot.h misc: ad525x_dpot: Unnecessary space before function pointer arguments 2017-12-18 15:59:17 +01:00
apds990x.c misc: apds990x: remove unused array ir_currents 2018-09-12 09:46:46 +02:00
apds9802als.c
aspeed-lpc-ctrl.c misc: aspeed-lpc-ctrl: Enable FWH and A2H bridge cycles 2018-03-15 18:20:51 +01:00
aspeed-lpc-snoop.c drivers/misc: Aspeed LPC snoop output using misc chardev 2018-07-16 13:30:47 +02:00
atmel_tclib.c
atmel-ssc.c misc: atmel-ssc: Fix section annotation on atmel_ssc_get_driver_data 2018-11-11 09:13:19 -08:00
bh1770glc.c misc: bh1770glc: remove unused array prox_curr_ma 2018-09-12 09:46:46 +02:00
cs5535-mfgpt.c
ds1682.c misc: ds1682: Ignore update-in-progress ETC reads 2018-01-09 17:03:57 +01:00
dummy-irq.c
enclosure.c misc: enclosure: Remove unnecessary error check 2017-12-07 18:45:31 +01:00
fsa9480.c misc: fsa9480: Add blank line after declarations. 2018-01-09 17:03:57 +01:00
hmc6352.c misc: hmc6352: fix potential Spectre v1 2018-09-12 09:31:00 +02:00
hpilo.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
hpilo.h misc: hpilo: Use SPDX-License-Identifier 2017-12-07 18:45:31 +01:00
ibmvmc.c misc: ibmvsm: Fix potential NULL pointer dereference 2019-01-18 14:14:14 +01:00
ibmvmc.h misc: IBM Virtual Management Channel Driver (VMC) 2018-05-14 16:35:42 +02:00
ics932s401.c misc: ics932s401: open brace should be on the previous line 2017-12-18 16:00:57 +01:00
ioc4.c
isl29003.c misc: isl29003: Missing a blank line after declarations 2017-12-07 18:45:31 +01:00
isl29020.c
Kconfig misc/pvpanic: resolve compile errors for arch=um 2018-11-27 08:58:52 +01:00
kgdbts.c misc: kgdbts: Fix restrict error 2018-09-25 20:21:02 +02:00
lattice-ecp3-config.c
Makefile Char/Misc driver patches for 4.21-rc1 2018-12-28 20:54:57 -08:00
pch_phub.c
pci_endpoint_test.c pci_endpoint_test: Add 2 ioctl commands 2018-07-19 11:46:57 +01:00
phantom.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
pti.c drivers/misc/intel/pti: Rename the header file to free up the namespace 2017-12-17 12:52:34 +01:00
pvpanic.c misc: pvpanic: fix warning implicit declaration 2019-01-18 16:42:05 +01:00
qcom-coincell.c
spear13xx_pcie_gadget.c
sram-exec.c
sram.c misc: sram: remove redundant null pointer check before of_node_put 2018-09-25 20:20:59 +02:00
sram.h
tifm_7xx1.c misc: tifm: Remove VLA 2018-04-23 13:31:27 +02:00
tifm_core.c
tsl2550.c tsl2550: fix lux1_input error in low light 2018-07-07 17:44:52 +02:00
vexpress-syscfg.c misc: vexpress: Off by one in vexpress_syscfg_exec() 2018-12-06 15:42:18 +01:00
vmw_balloon.c Char/Misc driver patches for 4.21-rc1 2018-12-28 20:54:57 -08:00