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2015-01-29dev: add per net_device packet type chainsSalam Noureddine
When many pf_packet listeners are created on a lot of interfaces the current implementation using global packet type lists scales poorly. This patch adds per net_device packet type lists to fix this problem. The patch was originally written by Eric Biederman for linux-2.6.29. Tested on linux-3.16. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Salam Noureddine <noureddine@arista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-29Merge tag 'samsung-dt-3' of ↵Olof Johansson
git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into next/dt Merge "Samsung 3rd DT updates for v3.20" from Kukjin Kim: - add DISP1 power domain for support HDMI support on exynos5420/5422/5800 and the power domain node including FIMD1, MIXER and HDMI modules (tested on exynos5420 Peach Pit and exynos5800 Peach Pi Chromebooks and exynos5422 Odroid XU3 by Javier Martinez Canillas) Note this is including a patch for adding clock IDs for the DISP1 power domain with Mike and Sylwester's acks so that could be handled together to avoid non-working. * tag 'samsung-dt-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung: ARM: dts: Add DISP1 power domain for exynos5420 clk: exynos5420: Add IDs for clocks used in DISP1 power domain Signed-off-by: Olof Johansson <olof@lixom.net>
2015-01-29vm: add VM_FAULT_SIGSEGV handling supportLinus Torvalds
The core VM already knows about VM_FAULT_SIGBUS, but cannot return a "you should SIGSEGV" error, because the SIGSEGV case was generally handled by the caller - usually the architecture fault handler. That results in lots of duplication - all the architecture fault handlers end up doing very similar "look up vma, check permissions, do retries etc" - but it generally works. However, there are cases where the VM actually wants to SIGSEGV, and applications _expect_ SIGSEGV. In particular, when accessing the stack guard page, libsigsegv expects a SIGSEGV. And it usually got one, because the stack growth is handled by that duplicated architecture fault handler. However, when the generic VM layer started propagating the error return from the stack expansion in commit fee7e49d4514 ("mm: propagate error from stack expansion even for guard page"), that now exposed the existing VM_FAULT_SIGBUS result to user space. And user space really expected SIGSEGV, not SIGBUS. To fix that case, we need to add a VM_FAULT_SIGSEGV, and teach all those duplicate architecture fault handlers about it. They all already have the code to handle SIGSEGV, so it's about just tying that new return value to the existing code, but it's all a bit annoying. This is the mindless minimal patch to do this. A more extensive patch would be to try to gather up the mostly shared fault handling logic into one generic helper routine, and long-term we really should do that cleanup. Just from this patch, you can generally see that most architectures just copied (directly or indirectly) the old x86 way of doing things, but in the meantime that original x86 model has been improved to hold the VM semaphore for shorter times etc and to handle VM_FAULT_RETRY and other "newer" things, so it would be a good idea to bring all those improvements to the generic case and teach other architectures about them too. Reported-and-tested-by: Takashi Iwai <tiwai@suse.de> Tested-by: Jan Engelhardt <jengelh@inai.de> Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # "s390 still compiles and boots" Cc: linux-arch@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-01-29iio: core: Introduce IIO_CHAN_INFO_DEBOUNCE_COUNT and _TIMEIrina Tirdea
The pedometer needs to filter out false steps that might be generated by tapping the foot, sitting, etc. To do that it computes the number of steps that occur in a given time and decides the user is moving only if this value is over a threshold. E.g.: the user starts moving only if he takes 4 steps in 3 seconds. This filter is applied only when the user starts moving. A device that has such pedometer functionality is Freescale's MMA9553L: http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf. To export this feature, this patch introduces IIO_CHAN_INFO_DEBOUNCE_COUNT and IIO_CHAN_INFO_DEBOUNCE_TIME. For the pedometer, in_steps_debounce_count will specify the number of steps that need to occur in in_steps_debounce_time seconds so that the pedometer decides the user is moving. Signed-off-by: Irina Tirdea <irina.tirdea@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-01-29iio: common: ssp_sensors: Add sensorhub driverKarol Wrona
Sensorhub is MCU dedicated to collect data and manage several sensors. Sensorhub is a spi device which provides a layer for IIO devices. It provides some data parsing and common mechanism for sensorhub sensors. Adds common sensorhub library for sensorhub driver and iio drivers which uses sensorhub MCU to communicate with sensors. Signed-off-by: Karol Wrona <k.wrona@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-01-29Merge tag 'efi-next' of ↵Ingo Molnar
git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/efi Pull EFI updates from Matt Fleming: " - Move efivarfs from the misc filesystem section to pseudo filesystem, since that's a more logical and accurate place - Leif Lindholm - Update efibootmgr URL in Kconfig help - Peter Jones - Improve accuracy of EFI guid function names - Borislav Petkov - Expose firmware platform size in sysfs for the benefit of EFI boot loader installers and other utilities - Steve McIntyre - Cleanup __init annotations for arm64/efi code - Ard Biesheuvel - Mark the UIE as unsupported for rtc-efi - Ard Biesheuvel - Fix memory leak in error code path of runtime map code - Dan Carpenter - Improve robustness of get_memory_map() by removing assumptions on the size of efi_memory_desc_t (which could change in future spec versions) and querying the firmware instead of guessing about the memmap size - Ard Biesheuvel - Remove superfluous guid unparse calls - Ivan Khoronzhuk - Delete unnecessary chosen@0 DT node FDT code since was duplicated from code in drivers/of and is entirely unnecessary - Leif Lindholm There's nothing super scary, mainly cleanups, and a merge from Ricardo who kindly picked up some patches from the linux-efi mailing list while I was out on annual leave in December. Perhaps the biggest risk is the get_memory_map() change from Ard, which changes the way that both the arm64 and x86 EFI boot stub build the early memory map. It would be good to have it bake in linux-next for a while. " Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-01-29NVMe: avoid kmalloc/kfree for smaller IOJens Axboe
Currently we allocate an nvme_iod for each IO, which holds the sg list, prps, and other IO related info. Set a threshold of 2 pages and/or 8KB of data, below which we can just embed this in the per-command pdu in blk-mq. For any IO at or below NVME_INT_PAGES and NVME_INT_BYTES, we save a kmalloc and kfree. For higher IOPS, this saves up to 1% of CPU time. Signed-off-by: Jens Axboe <axboe@fb.com> Reviewed-by: Keith Busch <keith.busch@intel.com>
2015-01-29usb: gadget: introduce is_selfpowered for usb_gadgetPeter Chen
Whether the gadget is selfpowerwed or not can be determined by composite core, so we can use a common entry to indicate if the self-powered is supported by gadget, and the related private variable at individual udc driver can be deleted. Signed-off-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2015-01-29nl80211: don't document per-wiphy interface dumpJohannes Berg
Such a feature doesn't exist and isn't really needed since you probably won't have enough interfaces to make it worthwhile, so just remove that from the documentation. Reported-by: booto [on IRC] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-01-29KVM: Rename kvm_arch_mmu_write_protect_pt_masked to be more generic for log ↵Kai Huang
dirty We don't have to write protect guest memory for dirty logging if architecture supports hardware dirty logging, such as PML on VMX, so rename it to be more generic. Signed-off-by: Kai Huang <kai.huang@linux.intel.com> Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-01-29HID: wacom: add support for Cintiq 27QHD and 27QHD touchPing Cheng
These devices have accelerometers. To report accelerometer coordinates, a new property, INPUT_PROP_ACCELEROMETER, is added. Signed-off-by: Ping Cheng <pingc@wacom.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2015-01-29ACPI / LPAT: Common table processing functionsSrinivas Pandruvada
Since LPAT table processing is also required for other thermal drivers, moved LPAT table related functions from intel PMIC driver (intel_pmic.c) to a stand alonge module with exported interfaces. In this way there will be no code duplication. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
2015-01-29mmc: Resolve BKOPS compatability issueAlexey Skidanov
This patch is coming to fix compatibility issue of BKOPS_EN field of EXT_CSD. In eMMC-5.1, BKOPS_EN was changed, and now it has two operational bits: Bit 0 - MANUAL_EN Bit 1 - AUTO_EN In previous eMMC revisions, only Bit 0 was supported. Signed-off-by: Alexey Skidanov <alexey.skidanov@sandisk.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-01-29bcma: implement host code support for PCIe Gen 2 devicesRafał Miłecki
This is stil incomplete, so we don't add PCI IDs of new devices yet. Purpose of this patch is to allow testing & adjusting rest of the code. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
2015-01-29bcma: add early_init function for PCIe core and move some fix into itRafał Miłecki
There are some PCIe core fixes that need to be applied before accessing SPROM, otherwise reading it may fail. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
2015-01-29bcma: detect SPROM revision 11Rafał Miłecki
Extracting values from it is still unsupported, but at least we'll display some meaningful error now. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
2015-01-29ftrace: let notrace function attribute disable hotpatching if necessaryHeiko Carstens
gcc supports an s390 specific function attribute called "hotpatch". It can be used to specify the number of halfwords that shall be added before and after a function and which shall be filled with nops for runtime patching. s390 will use the hotpatch attribute for function tracing, therefore make sure that the notrace function attribute either disables the mcount call or in case of hotpatch nop generation. Acked-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2015-01-28net: remove sock_iocbChristoph Hellwig
The sock_iocb structure is allocate on stack for each read/write-like operation on sockets, and contains various fields of which only the embedded msghdr and sometimes a pointer to the scm_cookie is ever used. Get rid of the sock_iocb and put a msghdr directly on the stack and pass the scm_cookie explicitly to netlink_mmap_sendmsg. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-28openvswitch: Add support for checksums on UDP tunnels.Jesse Gross
Currently, it isn't possible to request checksums on the outer UDP header of tunnels - the TUNNEL_CSUM flag is ignored. This adds support for requesting that UDP checksums be computed on transmit and properly reported if they are present on receive. Signed-off-by: Jesse Gross <jesse@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-28Merge tag 'nfc-next-3.20-1' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/sameo/nfc-next NFC: 3.20 first pull request This is the first NFC pull request for 3.20. With this one we have: - Secure element support for the ST Micro st21nfca driver. This depends on a few HCI internal changes in order for example to support more than one secure element per controller. - ACPI support for NXP's pn544 HCI driver. This controller is found on many x86 SoCs and is typically enumerated on the ACPI bus there. - A few st21nfca and st21nfcb fixes. Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-28tcp: stretch ACK fixes prepNeal Cardwell
LRO, GRO, delayed ACKs, and middleboxes can cause "stretch ACKs" that cover more than the RFC-specified maximum of 2 packets. These stretch ACKs can cause serious performance shortfalls in common congestion control algorithms that were designed and tuned years ago with receiver hosts that were not using LRO or GRO, and were instead politely ACKing every other packet. This patch series fixes Reno and CUBIC to handle stretch ACKs. This patch prepares for the upcoming stretch ACK bug fix patches. It adds an "acked" parameter to tcp_cong_avoid_ai() to allow for future fixes to tcp_cong_avoid_ai() to correctly handle stretch ACKs, and changes all congestion control algorithms to pass in 1 for the ACKed count. It also changes tcp_slow_start() to return the number of packet ACK "credits" that were not processed in slow start mode, and can be processed by the congestion control module in additive increase mode. In future patches we will fix tcp_cong_avoid_ai() to handle stretch ACKs, and fix Reno and CUBIC handling of stretch ACKs in slow start and additive increase mode. Reported-by: Eyal Perry <eyalpe@mellanox.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-29fs: add vfs_iter_{read,write} helpersChristoph Hellwig
Simple helpers that pass an arbitrary iov_iter to filesystems. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-29new helper: iov_iter_bvec()Al Viro
similar to iov_iter_kvec(), for ITER_BVEC ones Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-01-29Merge branch 'master' of ↵Dave Airlie
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into drm-next This backmerges drm-fixes into drm-next mainly for the amdkfd stuff, I'm not 100% confident, but it builds and the amdkfd folks can fix anything up. Signed-off-by: Dave Airlie <airlied@redhat.com> Conflicts: drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.h
2015-01-29clk: exynos5420: Add IDs for clocks used in DISP1 power domainJavier Martinez Canillas
When a power domain is powered off on Exynos5420 SoC, the input clocks of the devices attached to this power domain are re-parented to oscclk and restored to the original parent after powering on the power domain. So a reference to the input and parent clocks for the devices attached to a power domain are needed to be able to do the re-parenting. The DISP1 pd includes modules which uses the following clocks: ACLK_200_DISP1 (MIXER and HDMILINK) ACLK_300_DISP1 (FIMD1) ACLK_400_DISP1 (Internal Buses) Each of these clocks are generated as the output of a clock mux so add an ID for all of these clock muxes and their parents to be referenced in the DISP1 power domain device node. Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Acked-by: Michael Turquette <mturquette@linaro.org> Signed-off-by: Kukjin Kim <kgene@kernel.org>
2015-01-28ata: pata_platform: fix owner module reference mismatch for scsi hostAkinobu Mita
The owner module reference of the pata_of_platform's scsi_host is initialized to pata_platform's one, because pata_of_platform driver use a scsi_host_template defined in pata_platform. So this drivers can be unloaded even if the scsi device is being accessed. This fixes it by propagating the scsi_host_template to pata_of_platform driver. The scsi_host_template is passed through a new argument of __pata_platform_probe(). Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: "James E.J. Bottomley" <JBottomley@parallels.com> Cc: linux-ide@vger.kernel.org Cc: linux-scsi@vger.kernel.org
2015-01-28ata: ahci_platform: fix owner module reference mismatch for scsi hostAkinobu Mita
The owner module reference of the ahci platform's scsi_host is initialized to libahci_platform's one, because these drivers use a scsi_host_template defined in libahci_platform. So these drivers can be unloaded even if the scsi device is being accessed. This fixes it by pushing the scsi_host_template from libahci_platform to all leaf drivers. The scsi_host_template is passed through a new argument of ahci_platform_init_host(). Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: "James E.J. Bottomley" <JBottomley@parallels.com> Cc: linux-ide@vger.kernel.org Cc: linux-scsi@vger.kernel.org
2015-01-28Merge branch 'topic/ak411x-fix' into for-nextTakashi Iwai
2015-01-28ALSA: ak411x: Fix race of reinit() callsTakashi Iwai
Protect the call with a mutex, as this may be called in parallel (either from the PCM rate change and the clock change). Acked-by: Jaroslav Kysela <perex@perex.cz> Tested-by: Pavel Hofman <pavel.hofman@ivitera.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-01-28ALSA: ak411x: Add PM helper functionsTakashi Iwai
Define snd_ak4114_suspend() and snd_ak4114_resume() functions to handle PM properly, stopping and restarting the work at PM. Currently only ice1712/juli.c deals with the PM and ak4114, so fix the calls there appropriately. The same PM functions are defined in ak4113.c, too, although they aren't currently called yet (ice1712/quartet.c may be enhanced to support PM later). Acked-by: Jaroslav Kysela <perex@perex.cz> Tested-by: Pavel Hofman <pavel.hofman@ivitera.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-01-28ALSA: ak411x: Fix stall in work callbackTakashi Iwai
When ak4114 work calls its callback and the callback invokes ak4114_reinit(), it stalls due to flush_delayed_work(). For avoiding this, control the reentrance by introducing a refcount. Also flush_delayed_work() is replaced with cancel_delayed_work_sync(). The exactly same bug is present in ak4113.c and fixed as well. Reported-by: Pavel Hofman <pavel.hofman@ivitera.com> Acked-by: Jaroslav Kysela <perex@perex.cz> Tested-by: Pavel Hofman <pavel.hofman@ivitera.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-01-28Bluetooth: Perform a power cycle when receiving hardware error eventMarcel Holtmann
When receiving a HCI Hardware Error event, the controller should be assumed to be non-functional until issuing a HCI Reset command. The Bluetooth hardware errors are vendor specific and so add a new hdev->hw_error callback that drivers can provide to run extra code to handle the hardware error. After completing the vendor specific error handling perform a full reset of the Bluetooth stack by closing and re-opening the transport. Based-on-patch-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
2015-01-28ALSA: pcm: Add snd_interval_ranges() and snd_pcm_hw_constraint_ranges()Peter Rosin
Add helper functions to allow drivers to specify several disjoint ranges for a variable. In particular, there is a codec (PCM512x) that has a hole in its supported range of rates, due to PLL and divider restrictions. This is like snd_pcm_hw_constraint_list(), but for ranges instead of points. Signed-off-by: Peter Rosin <peda@axentia.se> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-01-28DT: iio: vadc: document dt bindingStanimir Varbanov
Document DT binding for Qualcomm SPMI PMIC voltage ADC driver. Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com> Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2015-01-28clk: Remove __clk_registerTomeu Vizoso
As it has never been used. Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Michael Turquette <mturquette@linaro.org>
2015-01-28regulator: da9211: Add gpio control for enable/disable of buckJames Ban
This is a patch for adding gpio control about enable/disable of buck. Signed-off-by: James Ban <james.ban.opensource@diasemi.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-01-28block: mark blk-mq devices as stackableMike Snitzer
Commit 4ee5eaf4 ("block: add a queue flag for request stacking support") introduced the concept of "STACKABLE" and blk-mq devices fit the definition in that they establish q->request_fn. So establish QUEUE_FLAG_STACKABLE in QUEUE_FLAG_MQ_DEFAULT. While not strictly needed (DM _could_ just check for q->mq_ops to assume the device is request-based), request-based DM support for blk-mq devices benefits from the ability to consistently check for QUEUE_FLAG_STACKABLE before allowing a device to be stacked into a request-based DM table. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2015-01-28ALSA: usx2y: Move UAPI definition into include/uapi/sound/usb_stream.hTakashi Iwai
The user-space API definition for usb_stream stuff should be moved to include/uapi/sound to be exposed publicly. While we're at it, add the missing ifdef guard for double inclusion, too. Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-01-28ALSA: Include linux/io.h instead of asm/io.hTakashi Iwai
Nowadays it's recommended. Replace all in a shot. Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-01-28tracing: Add array printing helperDave Martin
If a trace event contains an array, there is currently no standard way to format this for text output. Drivers are currently hacking around this by a) local hacks that use the trace_seq functionailty directly, or b) just not printing that information. For fixed size arrays, formatting of the elements can be open-coded, but this gets cumbersome for arrays of non-trivial size. These approaches result in non-standard content of the event format description delivered to userspace, so userland tools needs to be taught to understand and parse each array printing method individually. This patch implements a __print_array() helper that tracepoint implementations can use instead of reinventing it. A simple C-style syntax is used to delimit the array and its elements {like,this}. So that the helpers can be used with large static arrays as well as dynamic arrays, they take a pointer and element count: they can be used with __get_dynamic_array() for use with dynamic arrays. Link: http://lkml.kernel.org/r/1422449335-8289-2-git-send-email-javi.merino@arm.com Cc: Ingo Molnar <mingo@redhat.com> Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2015-01-28UBI: Add initial support for scatter gatherRichard Weinberger
Adds a new set of functions to deal with scatter gather. ubi_eba_read_leb_sg() will read from a LEB into a scatter gather list. The new data structure struct ubi_sgl will be used within UBI to hold the scatter gather list itself and metadata to have a cursor within the list. Signed-off-by: Richard Weinberger <richard@nod.at> Tested-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
2015-01-28UBI: Implement UBI_METAONLYRichard Weinberger
UBI_METAONLY is a new open mode for UBI volumes, it indicates that only meta data is being changed. Meta data in terms of UBI volumes means data which is stored in the UBI volume table but not on the volume itself. While it does not interfere with UBI_READONLY and UBI_READWRITE it is not allowed to use UBI_METAONLY together with UBI_EXCLUSIVE. Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com> Cc: Andrew Murray <amurray@embedded-bits.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at> Tested-by: Guido Martínez <guido@vanguardiasur.com.ar> Reviewed-by: Guido Martínez <guido@vanguardiasur.com.ar> Tested-by: Christoph Fritz <chf.fritz@googlemail.com> Tested-by: Andrew Murray <amurray@embedded-bits.co.uk>
2015-01-28clk: samsung: exynos4: Add divider clock id for memory bus frequencyChanwoo Choi
This patch adds the divider clock id for Exynos4 memory bus frequency. The clock id is used for DVFS (Dynamic Voltage/Frequency Scaling) feature of the exynos memory bus. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
2015-01-28Merge branch 'perf/urgent' into perf/core, to pick up fixesIngo Molnar
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-01-28xen/gntdev: mark userspace PTEs as special on x86 PV guestsDavid Vrabel
In an x86 PV guest, get_user_pages_fast() on a userspace address range containing foreign mappings does not work correctly because the M2P lookup of the MFN from a userspace PTE may return the wrong page. Force get_user_pages_fast() to fail on such addresses by marking the PTEs as special. If Xen has XENFEAT_gnttab_map_avail_bits (available since at least 4.0), we can do so efficiently in the grant map hypercall. Otherwise, it needs to be done afterwards. This is both inefficient and racy (the mapping is visible to the task before we fixup the PTEs), but will be fine for well-behaved applications that do not use the mapping until after the mmap() system call returns. Guests with XENFEAT_auto_translated_physmap (ARM and x86 HVM or PVH) do not need this since get_user_pages() has always worked correctly for them. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2015-01-28xen/grant-table: add a mechanism to safely unmap pages that are in useJennifer Herbert
Introduce gnttab_unmap_refs_async() that can be used to safely unmap pages that may be in use (ref count > 1). If the pages are in use the unmap is deferred and retried later. This polling is not very clever but it should be good enough if the cases where the delay is necessary are rare. The initial delay is 5 ms and is increased linearly on each subsequent retry (to reduce load if the page is in use for a long time). This is needed to allow block backends using grant mapping to safely use network storage (block or filesystem based such as iSCSI or NFS). The network storage driver may complete a block request whilst there is a queued network packet retry (because the ack from the remote end races with deciding to queue the retry). The pages for the retried packet would be grant unmapped and the network driver (or hardware) would access the unmapped page. Signed-off-by: Jennifer Herbert <jennifer.herbert@citrix.com> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
2015-01-28xen: mark grant mapped pages as foreignJennifer Herbert
Use the "foreign" page flag to mark pages that have a grant map. Use page->private to store information of the grant (the granting domain and the grant reference). Signed-off-by: Jennifer Herbert <jennifer.herbert@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
2015-01-28xen/grant-table: add helpers for allocating pagesDavid Vrabel
Add gnttab_alloc_pages() and gnttab_free_pages() to allocate/free pages suitable to for granted maps. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2015-01-28xen/grant-table: pre-populate kernel unmap ops for xen_gnttab_unmap_refs()David Vrabel
When unmapping grants, instead of converting the kernel map ops to unmap ops on the fly, pre-populate the set of unmap ops. This allows the grant unmap for the kernel mappings to be trivially batched in the future. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2015-01-28mm: add 'foreign' alias for the 'pinned' page flagJennifer Herbert
The foreign page flag will be used by Xen guests to mark pages that have grant mappings of frames from other (foreign) guests. The foreign flag is an alias for the existing (Xen-specific) pinned flag. This is safe because pinned is only used on pages used for page tables and these cannot also be foreign. Signed-off-by: Jennifer Herbert <jennifer.herbert@citrix.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Vrabel <david.vrabel@citrix.com>