linux/drivers
Hitoshi Mitake 797a796a13 asm-generic: architecture independent readq/writeq for 32bit environment
This provides unified readq()/writeq() helper functions for 32-bit
drivers.

For some cases, readq/writeq without atomicity is harmful, and order of
io access has to be specified explicitly.  So in this patch, new two
header files which contain non-atomic readq/writeq are added.

 - <asm-generic/io-64-nonatomic-lo-hi.h> provides non-atomic readq/
   writeq with the order of lower address -> higher address

 - <asm-generic/io-64-nonatomic-hi-lo.h> provides non-atomic readq/
   writeq with reversed order

This allows us to remove some readq()s that were added drivers when the
default non-atomic ones were removed in commit dbee8a0aff ("x86:
remove 32-bit versions of readq()/writeq()")

The drivers which need readq/writeq but can do with the non-atomic ones
must add the line:

  #include <asm-generic/io-64-nonatomic-lo-hi.h> /* or hi-lo.h */

But this will be nop in 64-bit environments, and no other #ifdefs are
required.  So I believe that this patch can solve the problem of
 1. driver-specific readq/writeq
 2. atomicity and order of io access

This patch is tested with building allyesconfig and allmodconfig as
ARCH=x86 and ARCH=i386 on top of tip/master.

Cc: Kashyap Desai <Kashyap.Desai@lsi.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Ravi Anand <ravi.anand@qlogic.com>
Cc: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Jason Uhlenkott <juhlenko@akamai.com>
Cc: James Bottomley <James.Bottomley@parallels.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: James Bottomley <jbottomley@parallels.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Hitoshi Mitake <h.mitake@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-02-21 16:47:28 -08:00
..
accessibility
acpi ACPI: remove duplicated lines of merging problems with acpi_processor_add 2012-02-08 15:07:03 -08:00
amba
ata pata/at91: use newly introduced SMC accessors 2012-02-13 18:31:37 +01:00
atm
auxdisplay
base Fixes a bootstrapping issue for some registers when a less commonly used 2012-02-18 15:37:25 -08:00
bcma bcma: don't fail for bad SPROM CRC 2012-02-06 14:37:52 -05:00
block asm-generic: architecture independent readq/writeq for 32bit environment 2012-02-21 16:47:28 -08:00
bluetooth
cdrom cdrom: move shared static to cdrom_device_info 2012-02-08 20:03:14 +01:00
char agp: fix scratch page cleanup 2012-01-26 18:36:48 +00:00
clk
clocksource
connector
cpufreq
cpuidle
crypto
dca
devfreq
dio
dma i.MX SDMA: Fix burstsize settings 2012-02-02 14:00:43 +05:30
edac asm-generic: architecture independent readq/writeq for 32bit environment 2012-02-21 16:47:28 -08:00
eisa
firewire firewire: ohci: disable MSI on Ricoh controllers 2012-01-30 21:33:34 +01:00
firmware
gpio gpio: Add missing spin_lock_init in gpio-ml-ioh driver 2012-02-01 21:59:37 -07:00
gpu drm/radeon/kms: fix MSI re-arm on rv370+ 2012-02-14 13:36:23 +00:00
hid HID: wiimote: fix invalid power_supply_powers call 2012-02-07 13:40:56 +01:00
hv
hwmon hwmon: (f75375s) Let f75375_update_device treat pwmX as a measured value 2012-02-09 11:21:49 -08:00
hwspinlock
i2c Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/olof/tegra into fixes 2012-02-13 05:40:38 +00:00
ide ARM: at91: drop ide driver in favor of the pata one 2012-02-13 18:31:37 +01:00
idle ACPI processor hotplug: Delay acpi_processor_start() call for hotplugged cores 2012-01-19 21:26:32 -05:00
ieee802154
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-02-10 14:18:46 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2012-02-04 10:57:42 -08:00
iommu iommu/msm: Fix error handling in msm_iommu_unmap() 2012-01-30 12:53:14 +01:00
isdn isdn: type bug in isdn_net_header() 2012-02-09 15:41:29 -05:00
leds drivers/leds/leds-lm3530.c: fix setting pltfm->als_vmax 2012-02-08 19:03:51 -08:00
lguest
macintosh powerpc/adb: Use set_current_state() 2012-02-16 16:15:12 +11:00
mca
md Some simple md-related fixes. 2012-02-08 19:06:30 -08:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2012-01-26 17:04:47 -08:00
memstick
message
mfd Merge branch 'omap-fixes-warnings' of git://git.linaro.org/people/rmk/linux-arm 2012-02-13 14:16:07 -08:00
misc Minor char-misc fixes for 3.3-rc3 2012-02-09 13:51:13 -08:00
mmc mmc: dw_mmc: Fix PIO mode with support of highmem 2012-02-13 20:39:05 -05:00
mtd - Fix a regression in 16-bit Atmel NAND flash which was introduced in 3.1 2012-02-04 07:17:47 -08:00
net net/ethernet: ks8851_mll fix irq handling 2012-02-15 15:41:10 -05:00
nfc
nubus
of
oprofile
parisc
parport
pci Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-02-18 15:26:11 -08:00
pcmcia pcmcia: fix socket refcount decrementing on each resume 2012-02-08 19:03:51 -08:00
pinctrl pinctrl: restore pin naming 2012-02-01 19:35:21 +01:00
platform asm-generic: architecture independent readq/writeq for 32bit environment 2012-02-21 16:47:28 -08:00
pnp
power lp8727_charger: Add terminating entry for i2c_device_id table 2012-02-01 21:34:26 +04:00
pps
ps3
ptp
rapidio
regulator regulator: Fix getting voltage in max8649_enable_time() 2012-02-10 11:20:55 +00:00
rtc ARM: at91:rtc/rtc-at91sam9: ioremap register bank 2012-02-13 18:31:36 +01:00
s390 [S390] 3215 deadlock with tty_wakeup 2012-02-17 10:29:33 +01:00
sbus
scsi asm-generic: architecture independent readq/writeq for 32bit environment 2012-02-21 16:47:28 -08:00
sfi
sh
sn
spi spi-topcliff-pch: rename pch_spi_pcidev to pch_spi_pcidev_driver 2012-02-05 23:24:17 -07:00
ssb ssb: fix cardbus slot in hostmode 2012-02-01 15:26:00 -05:00
staging staging: pohmelfs: remove drivers/staging/pohmelfs 2012-02-08 16:19:06 -08:00
target target: Fix unsupported WRITE_SAME sense payload 2012-02-07 06:48:58 +00:00
tc
telephony
thermal thermal: Rename generate_netlink_event 2012-01-23 03:15:25 -05:00
tty tty: serial: omap-serial: wakeup latency constraint is in microseconds, not milliseconds 2012-02-09 10:48:36 -08:00
uio
usb USB: usbserial: add new PID number (0xa951) to the ftdi driver 2012-02-03 11:22:44 -08:00
uwb
vhost
video ARM: omap: fix oops in drivers/video/omap2/dss/dpi.c 2012-02-09 17:56:53 +00:00
virt
virtio virtio: correct the memory barrier in virtqueue_kick_prepare() 2012-01-28 08:10:23 +10:30
vlynq
w1
watchdog watchdog: iTCO_wdt: add Intel Lynx Point DeviceIDs 2012-01-27 10:01:16 +01:00
xen xenbus_dev: add missing error check to watch handling 2012-02-03 16:07:05 -05:00
zorro
Kconfig
Makefile