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Martin Schwidefsky abf09bed3c s390/mm: implement software dirty bits 
The s390 architecture is unique in respect to dirty page detection,
it uses the change bit in the per-page storage key to track page
modifications. All other architectures track dirty bits by means
of page table entries. This property of s390 has caused numerous
problems in the past, e.g. see git commit ef5d437f71
"mm: fix XFS oops due to dirty pages without buffers on s390".

To avoid future issues in regard to per-page dirty bits convert
s390 to a fault based software dirty bit detection mechanism. All
user page table entries which are marked as clean will be hardware
read-only, even if the pte is supposed to be writable. A write by
the user process will trigger a protection fault which will cause
the user pte to be marked as dirty and the hardware read-only bit
is removed.

With this change the dirty bit in the storage key is irrelevant
for Linux as a host, but the storage key is still required for
KVM guests. The effect is that page_test_and_clear_dirty and the
related code can be removed. The referenced bit in the storage
key is still used by the page_test_and_clear_young primitive to
provide page age information.

For page cache pages of mappings with mapping_cap_account_dirty
there will not be any change in behavior as the dirty bit tracking
already uses read-only ptes to control the amount of dirty pages.
Only for swap cache pages and pages of mappings without
mapping_cap_account_dirty there can be additional protection faults.
To avoid an excessive number of additional faults the mk_pte
primitive checks for PageDirty if the pgprot value allows for writes
and pre-dirties the pte. That avoids all additional faults for
tmpfs and shmem pages until these pages are added to the swap cache.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
 		2013-02-14 15:55:23 +01:00
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accessibility
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acpi Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-01-31 17:08:43 +11:00
amba Drivers: amba: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
ata ata: disable ATA for s390 2013-02-14 15:55:13 +01:00
atm atm/iphase: rename fregt_t -> ffreg_t 2013-02-08 14:22:05 -05:00
auxdisplay Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
base Merge remote-tracking branch 'regmap/fix/debugfs' into tmp 2013-01-24 19:04:16 +08:00
bcma Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2013-02-06 13:55:44 -05:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2013-02-07 08:38:33 +11:00
bluetooth Bluetooth device 04ca:3008 should use ath3k 2013-01-10 02:51:03 -02:00
bus Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
cdrom Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
char virtio_console: Don't access uninitialized data. 2013-02-07 11:37:37 +10:30
clk mvebu fixes for v3.8-rc5 2013-01-23 20:30:52 -08:00
clocksource Drivers: clocksource: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
connector Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
cpufreq cpufreq: Add module aliases for acpi-cpufreq 2013-01-22 22:33:46 +01:00
cpuidle cpuidle: remove the power_specified field in the driver 2013-01-15 14:18:04 +01:00
crypto Drivers: crypto: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
dca
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devfreq PM / devfreq: exynos4_bus: honor RCU lock usage 2013-01-22 13:28:40 +01:00
dio
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dma Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma 2013-01-24 10:17:49 -08:00
edac EDAC: Fix kcalloc argument order 2013-01-30 11:38:25 +01:00
eisa
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extcon
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firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-12-13 12:00:02 -08:00
firmware Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-01-31 17:10:36 +11:00
gpio gpio: mvebu: Don't free chip label memory 2013-01-17 12:27:08 +01:00
gpu Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile into akpm 2013-02-12 15:13:42 -08:00
hid Merge branch 'for-3.8/upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2013-02-01 08:44:59 +11:00
hsi Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
hv Drivers: hv: balloon: Fix a memory leak 2013-01-17 11:58:00 -08:00
hwmon hwmon: (vexpress) Fix build error seen if CONFIG_OF_DEVICE is not set 2013-01-09 21:47:22 -08:00
hwspinlock
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i2c i2c-designware: add missing MODULE_LICENSE 2013-01-22 16:43:34 +01:00
ide Drivers: ide: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
idle intel_idle: Don't register CPU notifier if we are not running. 2013-01-18 13:43:43 +01:00
iio Staging fixes for 3.8-rc3 2013-01-14 09:08:38 -08:00
infiniband Merge branches 'ipoib', 'mlx4' and 'qib' into for-next 2013-02-05 09:45:25 -08:00
input drivers/input/joystick/analog.c: enable precise timer 2013-02-04 12:53:12 -05:00
iommu Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2013-01-30 12:02:26 +11:00
ipack TTY/Serial merge for 3.8-rc1 2012-12-11 14:08:47 -08:00
irqchip ARM: arm-soc: Device-tree updates, take 2 2012-12-14 14:42:53 -08:00
isdn isdn/gigaset: fix zero size border case in debug dump 2013-01-21 17:36:02 -05:00
leds leds: leds-gpio: set devm_gpio_request_one() flags param correctly 2013-01-02 17:58:41 -08:00
lguest lguest: fix typo 2012-12-18 15:19:06 +10:30
macintosh Drivers: macintosh: remove __dev* attributes. 2013-01-03 15:57:14 -08:00
md A fix for stacked dm thin devices and a fix for the new dm WRITE SAME 2013-02-01 12:04:22 +11:00
media drivers/media: add missing GENERIC_HARDIRQS dependency 2013-02-14 15:55:21 +01:00
memory Drivers: memory: remove __dev* attributes. 2013-01-03 15:57:14 -08:00
memstick
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message Drivers: message: remove __dev* attributes. 2013-01-03 15:57:14 -08:00
mfd This is the first pull request for MFD fixes for 3.8 2013-01-28 11:51:57 -08:00
misc Revert "drivers/misc/ti-st: remove gpio handling" 2013-01-22 17:22:47 -08:00
mmc This is the first pull request for MFD fixes for 3.8 2013-01-28 11:51:57 -08:00
mtd A small set of simple regression and build fixes for 3.8: 2013-02-05 07:54:11 +11:00
net drivers/net,AT91RM9200: add missing GENERIC_HARDIRQS dependency 2013-02-14 15:55:20 +01:00
nfc Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
nubus
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of of: Fix export of of_find_matching_node_and_match() 2012-12-19 10:58:53 +00:00
oprofile
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parisc Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
parport parport: disable PC-style parallel port support for s390 2013-02-14 15:55:14 +01:00
pci s390/pci: fix hotplug module init 2013-02-14 15:55:17 +01:00
pcmcia ARM: arm-soc: Header cleanups 2012-12-12 11:45:16 -08:00
pinctrl pinctrl: sirf: replace of_gpio_simple_xlate by sirf specific of_xlate 2013-02-05 15:27:39 +01:00
platform samsung-laptop: Disable on EFI hardware 2013-01-30 11:52:11 -08:00
pnp PNP: Handle IORESOURCE_BITS in resource allocation 2013-01-03 13:10:53 +01:00
power ARM: arm-soc fixes for 3.8-rc 2013-01-08 18:53:56 -08:00
pps Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
ps3 Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
ptp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2012-12-12 18:07:07 -08:00
pwm pwm: Changes for v3.8-rc1 2012-12-19 08:19:07 -08:00
rapidio Driver core updates for 3.8-rc1 2012-12-11 13:13:55 -08:00
regulator Merge remote-tracking branch 'regulator/fix/tps65910' into tmp 2013-02-06 11:28:53 +00:00
remoteproc Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
rpmsg Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
rtc drivers/rtc/rtc-pl031.c: restore ST variant functionality 2013-02-12 14:34:00 -08:00
s390 s390/mm: implement software dirty bits 2013-02-14 15:55:23 +01:00
sbus Drivers: sbus: remove __dev* attributes. 2013-01-03 15:57:03 -08:00
scsi efi: Make 'efi_enabled' a function to query EFI facilities 2013-01-30 11:51:59 -08:00
sfi
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sh sh: clkfwk: bugfix: sh_clk_div_enable() care sh_clk_div_set_rate() if div6 2013-01-11 20:57:58 +09:00
sn Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
spi spi/sh-hspi: fix return value check in hspi_probe(). 2012-12-19 15:11:41 +00:00
ssb Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless into for-davem 2013-02-06 13:55:44 -05:00
staging Staging bugfixes for 3.8-rc4 2013-01-18 14:05:25 -08:00
target target: Fix divide by zero bug in fabric_max_sectors for unconfigured devices 2013-01-31 15:22:53 -08:00
tc
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thermal Drivers: thermal: remove __dev* attributes. 2013-01-03 15:57:02 -08:00
tty s390/3270: asynchronous size sensing 2013-02-14 15:55:03 +01:00
uio uio: remove !S390 dependency from Kconfig 2013-02-14 15:55:18 +01:00
usb USB: storage: optimize to match the Huawei USB storage devices and support new switch command 2013-02-04 10:41:40 -08:00
uwb
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vfio vfio-pci: Fix buffer overfill 2013-01-15 10:45:26 -07:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-02-09 07:55:24 +11:00
video This is yet another critical imxfb fixes held off by absence of FB 2013-01-23 20:35:02 -08:00
virt Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2012-12-18 09:58:09 -08:00
virtio Drivers: virtio: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
vlynq Drivers: vlynq: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
vme
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w1 Drivers: w1: remove last __devexit_p() instance 2013-01-03 15:57:01 -08:00
watchdog watchdog: twl4030_wdt: add DT support 2013-01-02 12:07:05 +01:00
xen Two fixes: 2013-02-08 11:55:27 +11:00
zorro Drivers: zorro: remove CONFIG_HOTPLUG usage 2013-01-03 15:57:01 -08:00
Kconfig
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Makefile
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