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Dan Williams 96601adb74 x86, pmem: clarify that ARCH_HAS_PMEM_API implies PMEM mapped WB 
Given that a write-back (WB) mapping plus non-temporal stores is
expected to be the most efficient way to access PMEM, update the
definition of ARCH_HAS_PMEM_API to imply arch support for
WB-mapped-PMEM.  This is needed as a pre-requisite for adding PMEM to
the direct map and mapping it with struct page.

The above clarification for X86_64 means that memcpy_to_pmem() is
permitted to use the non-temporal arch_memcpy_to_pmem() rather than
needlessly fall back to default_memcpy_to_pmem() when the pcommit
instruction is not available.  When arch_memcpy_to_pmem() is not
guaranteed to flush writes out of cache, i.e. on older X86_32
implementations where non-temporal stores may just dirty cache,
ARCH_HAS_PMEM_API is simply disabled.

The default fall back for persistent memory handling remains.  Namely,
map it with the WT (write-through) cache-type and hope for the best.

arch_has_pmem_api() is updated to only indicate whether the arch
provides the proper helpers to meet the minimum "writes are visible
outside the cache hierarchy after memcpy_to_pmem() + wmb_pmem()".  Code
that cares whether wmb_pmem() actually flushes writes to pmem must now
call arch_has_wmb_pmem() directly.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
[hch: set ARCH_HAS_PMEM_API=n on x86_32]
Reviewed-by: Christoph Hellwig <hch@lst.de>
[toshi: x86_32 compile fixes]
Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
 		2015-08-27 19:40:59 -04:00
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accessibility
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acpi x86, pmem: clarify that ARCH_HAS_PMEM_API implies PMEM mapped WB 2015-08-27 19:40:59 -04:00
amba
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android
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ata Merge branch 'for-4.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2015-07-24 16:54:59 -07:00
atm
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auxdisplay
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base Fix firmware loader uevent buffer NULL pointer dereference 2015-07-09 11:20:01 -07:00
bcma
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block dax: drop size parameter to ->direct_access() 2015-08-27 19:40:58 -04:00
bluetooth Bluetooth: btbcm: allow btbcm_read_verbose_config to fail on Apple 2015-07-14 22:54:55 +02:00
bus ARM: SoC: driver updates for v4.2 2015-06-26 11:54:29 -07:00
cdrom
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char Merge tag 'tpm-fixes-for-4.2-rc2' of https://github.com/PeterHuewe/linux-tpmdd into for-linus 2015-07-15 21:46:59 +10:00
clk Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00
clocksource clocksource/imx: Define clocksource for mx27 2015-07-07 10:44:45 +02:00
connector
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cpufreq Merge branches 'pm-cpuidle', 'pm-cpufreq' and 'acpi-resources' 2015-07-16 23:47:19 +02:00
cpuidle suspend-to-idle: Prevent RCU from complaining about tick_freeze() 2015-07-09 22:59:49 +02:00
crypto crypto: nx - Fix reentrancy bugs 2015-07-08 15:14:13 +08:00
dca
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devfreq
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dio
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dma Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00
dma-buf
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edac A build fix for octeon_edac from Aaro Koskinen. 2015-07-03 12:10:12 -07:00
eisa
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extcon extcon: Redefine the unique id of supported external connectors without 'enum extcon' type 2015-06-12 17:01:42 -07:00
firewire
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firmware * Fix a bug in the Common Platform Error Record (CPER) driver that 2015-07-21 09:52:51 +02:00
fmc
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gpio Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-18 10:27:12 -07:00
gpu Merge tag 'drm-atmel-hlcdc/fixes-for-4.2' of https://github.com/bbrezillon/linux-at91 into drm-fixes 2015-07-24 14:27:44 +10:00
hid HID: cp2112: fix to force single data-report reply 2015-07-08 12:40:23 +02:00
hsi Fix up implicit <module.h> users that will break later. 2015-07-02 10:25:22 -07:00
hv Drivers: hv: vmbus: Allocate ring buffer memory in NUMA aware fashion 2015-06-12 16:58:33 -07:00
hwmon hwmon: (w83627ehf) Use swap() in w82627ehf_swap_tempreg() 2015-07-03 14:39:06 +02:00
hwspinlock hwspinlock: qcom: Correct msb in regmap_field 2015-07-01 16:15:05 +03:00
hwtracing/coresight
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i2c i2c: Mark instantiated device nodes with OF_POPULATE 2015-07-09 22:25:54 +02:00
ide Minor merge needed, due to function move. 2015-07-01 10:49:25 -07:00
idle
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iio iio:light:stk3310: make endianness independent of host 2015-07-19 14:54:45 +01:00
infiniband x86/mm/pat, drivers/infiniband/ipath: Replace WARN() with pr_warn() 2015-07-21 09:42:54 +02:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-07-24 16:33:11 -07:00
iommu iommu/vt-d: Fix VM domain ID leak 2015-07-23 14:17:39 +02:00
ipack
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irqchip Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-18 10:27:12 -07:00
isdn arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead 2015-08-10 23:07:05 -04:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2015-07-01 19:09:11 -07:00
lguest Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
macintosh macintosh/nvram: Remove as unused 2015-06-15 16:42:37 +10:00
mailbox Replace module_init with appropriate alternate initcall in non modules. 2015-07-02 10:36:29 -07:00
mcb
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md Some md fixes for 4.2 2015-07-25 11:24:58 -07:00
media x86/mm/pat, drivers/media/ivtv: Move the PAT warning and replace WARN() with pr_warn() 2015-07-21 09:42:54 +02:00
memory Merge branch 'fixes-rc1' into omap-for-v4.2/fixes 2015-07-06 05:33:17 -07:00
memstick memstick: remove deprecated use of pci api 2015-06-30 19:44:57 -07:00
message fusion: remove dead MTRR code 2015-06-13 08:44:14 -07:00
mfd Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00
misc mei: prevent unloading mei hw modules while the device is opened. 2015-07-22 21:31:05 -07:00
mmc mmc: sdhci-pxav3: fix platform_data is not initialized 2015-07-24 10:18:39 +02:00
mtd arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead 2015-08-10 23:07:05 -04:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-07-22 14:45:25 -07:00
nfc Char/Misc driver patches for 4.2-rc1 2015-06-26 14:51:15 -07:00
ntb NTB: Add split BAR output for debugfs stats 2015-07-04 14:09:32 -04:00
nubus
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nvdimm x86, pmem: clarify that ARCH_HAS_PMEM_API implies PMEM mapped WB 2015-08-27 19:40:59 -04:00
of Devicetree changes for v4.2 2015-07-01 19:40:18 -07:00
oprofile
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parisc
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parport parport: Revert "parport: fix memory leak" 2015-07-25 12:48:05 -07:00
pci cleanup IORESOURCE_CACHEABLE vs ioremap() 2015-08-10 23:07:06 -04:00
pcmcia Fix up implicit <module.h> users that will break later. 2015-07-02 10:25:22 -07:00
phy phy: berlin-usb: fix divider for BG2 2015-07-15 20:02:09 +05:30
pinctrl Pin control fixes for the v4.2 series: 2015-07-21 15:27:27 -07:00
platform intel_scu_ipc: move local memory initialization out of a mutex 2015-07-14 11:02:44 -07:00
pnp cleanup IORESOURCE_CACHEABLE vs ioremap() 2015-08-10 23:07:06 -04:00
power Replace module_platform_driver with builtin_platform driver in non modules. 2015-07-02 10:42:13 -07:00
powercap
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pps
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ps3
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ptp
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pwm pwm: Changes for v4.2-rc1 2015-06-23 13:32:38 -07:00
rapidio Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-06-23 14:08:54 -07:00
ras
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regulator Merge remote-tracking branches 'regulator/fix/88pm800', 'regulator/fix/max8973', 'regulator/fix/s2mps11' and 'regulator/fix/supply' into regulator-linus 2015-07-24 16:19:25 +01:00
remoteproc remoteproc: fix !CONFIG_OF build breakage 2015-06-18 11:44:41 +03:00
reset
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rpmsg
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rtc rtc: armada38x: Remove unused variable from armada38x_rtc_set_time() 2015-07-18 00:42:31 +02:00
s390 dax: drop size parameter to ->direct_access() 2015-08-27 19:40:58 -04:00
sbus
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scsi cleanup IORESOURCE_CACHEABLE vs ioremap() 2015-08-10 23:07:06 -04:00
sfi
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sh Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-01 15:19:35 -07:00
sn
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soc ARM: SoC: late fixes and dependencies 2015-07-02 14:40:49 -07:00
spi Merge remote-tracking branches 'spi/fix/gqspi', 'spi/fix/imx', 'spi/fix/mg-spfi' and 'spi/fix/spidev' into spi-linus 2015-07-24 16:19:50 +01:00
spmi
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ssb
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staging visorbus: switch from ioremap_cache to memremap 2015-08-14 13:23:28 -04:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-07-04 14:13:43 -07:00
tc
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thermal Minor merge needed, due to function move. 2015-07-01 10:49:25 -07:00
thunderbolt
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tty arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead 2015-08-10 23:07:05 -04:00
uio uio: pruss: Drop depends on ARCH_DAVINCI_DA850 from config 2015-06-12 17:01:43 -07:00
usb USB: OHCI: fix bad #define in ohci-tmio.c 2015-07-22 14:49:42 -07:00
uwb
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vfio VFIO updates for v4.2 2015-06-28 12:32:13 -07:00
vhost virtio/vhost: fixes for 4.2 2015-07-23 13:07:04 -07:00
video cleanup IORESOURCE_CACHEABLE vs ioremap() 2015-08-10 23:07:06 -04:00
virt
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virtio virtio/vhost: cross endian support 2015-07-03 16:02:25 -07:00
vlynq
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vme vme: tsi148: depend on HAS_DMA for Kconfig 2015-06-12 17:31:05 -07:00
w1 w1: use correct lock on error in w1_seq_show() 2015-06-12 16:58:33 -07:00
watchdog Update Viresh Kumar's email address 2015-07-17 16:39:53 -07:00
xen Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-07-04 14:13:43 -07:00
zorro
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Kconfig libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support 2015-06-24 21:24:10 -04:00
Makefile The libnvdimm sub-system introduces, in addition to the libnvdimm-core, 2015-06-29 10:34:42 -07:00