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f42a0fd13b
linux/drivers/misc
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Jorgen Hansen f42a0fd13b VMCI: Use 32bit atomics for queue headers on X86_32 
This change restricts the reading and setting of the head and tail
pointers on 32bit X86 to 32bit for both correctness and
performance reasons. On uniprocessor X86_32, the atomic64_read
may be implemented as a non-locked cmpxchg8b. This may result in
updates to the pointers done by the VMCI device being overwritten.
On MP systems, there is no such correctness issue, but using 32bit
atomics avoids the overhead of the locked 64bit operation. All this
is safe because the queue size on 32bit systems will never exceed
a 32bit value.

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-07 21:36:02 -08:00
..
altera-stapl drivers/misc/altera-stapl/altera.c: remove extraneous KERN_INFO prefix 2015-06-25 17:00:38 -07:00
c2port drivers: misc: Drop unlikely before IS_ERR(_OR_NULL) 2015-09-29 15:11:40 +02:00
cb710
cxl powerpc updates for 4.5 2016-01-15 13:18:47 -08:00
echo
eeprom - New Device Support 2015-11-06 10:23:50 -08:00
genwqe misc: genwqe: fix a comment typo 2015-10-04 12:57:15 +01:00
ibmasm kbuild: Allow to specify composite modules with modname-m 2015-11-25 11:23:25 +01:00
lis3lv02d spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
mei mei: split amthif client init from end of clients enumeration 2016-02-07 14:47:20 -08:00
mic misc: mic: fix incorrect use of error codes in SCIF DMA driver 2016-02-07 21:25:50 -08:00
sgi-gru misc: sgi-gru: fix return of error 2015-10-04 12:55:59 +01:00
sgi-xp mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
ti-st ti-st: use worker instead of calling st_int_write in wake up 2015-09-20 22:52:13 -07:00
vmw_vmci VMCI: Use 32bit atomics for queue headers on X86_32 2016-02-07 21:36:02 -08:00
ad525x_dpot-i2c.c misc: ad525x_dpot: Remove unnecessary MODULE_ALIAS() 2015-09-20 19:33:29 -07:00
ad525x_dpot-spi.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
ad525x_dpot.c ad525x_dpot:Remove break after return 2015-01-12 05:04:12 -08:00
ad525x_dpot.h
apds990x.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
apds9802als.c
arm-charlcd.c
atmel_tclib.c misc: atmel_tclib: get and use slow clock 2015-10-06 12:33:14 +02:00
atmel-ssc.c
bh1770glc.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
bh1780gli.c misc: bh1780: Add module aliases 2015-03-16 21:10:28 +01:00
bmp085-i2c.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
bmp085-spi.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
bmp085.c
bmp085.h
cs5535-mfgpt.c
ds1682.c misc: ds1682: clean up ds1682_eeprom_read() and ds1682_eeprom_write() 2015-08-05 13:53:39 -07:00
dummy-irq.c
enclosure.c enclosure: fix WARN_ON removing an adapter in multi-path devices 2015-03-31 08:53:36 +03:00
fsa9480.c
hmc6352.c
hpilo.c misc: hpilo: Change e-mail address from hp.com to hpe.com 2015-10-04 12:42:33 +01:00
hpilo.h
ics932s401.c
ioc4.c misc: ioc4: simplify wave period measurement in clock_calibrate 2015-01-12 05:04:11 -08:00
isl29003.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
isl29020.c
Kconfig misc: ibmasm: fix build errors 2016-01-20 17:09:18 -08:00
kgdbts.c drivers/misc: make kgdbts.c slightly more explicitly non-modular 2015-09-20 19:32:35 -07:00
lattice-ecp3-config.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
lkdtm.c lkdtm: fix ACCESS_USERSPACE test 2015-10-29 09:02:16 +09:00
Makefile ARM: qcom: Add coincell charger driver 2015-07-29 13:37:18 -07:00
pch_phub.c
phantom.c
pti.c
qcom-coincell.c ARM: qcom: Add coincell charger driver 2015-07-29 13:37:18 -07:00
spear13xx_pcie_gadget.c spear13xx_pcie_gadget: use per-attribute show and store methods 2015-10-13 22:17:40 -07:00
sram.c misc: sram: partition base address belongs to __iomem space 2015-10-18 19:00:36 -07:00
ti_dac7512.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
tifm_7xx1.c misc: tifm: match return type of wait_for_completion_timeout 2015-03-25 11:36:38 +01:00
tifm_core.c
tsl2550.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
vexpress-syscfg.c
vmw_balloon.c mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00