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2011-08-03Add Kconfig option ARCH_HAVE_NMI_SAFE_CMPXCHGHuang Ying13-0/+15
cmpxchg() is widely used by lockless code, including NMI-safe lockless code. But on some architectures, the cmpxchg() implementation is not NMI-safe, on these architectures the lockless code may need a spin_trylock_irqsave() based implementation. This patch adds a Kconfig option: ARCH_HAVE_NMI_SAFE_CMPXCHG, so that NMI-safe lockless code can depend on it or provide different implementation according to it. On many architectures, cmpxchg is only NMI-safe for several specific operand sizes. So, ARCH_HAVE_NMI_SAFE_CMPXCHG define in this patch only guarantees cmpxchg is NMI-safe for sizeof(unsigned long). Signed-off-by: Huang Ying <ying.huang@intel.com> Acked-by: Mike Frysinger <vapier@gentoo.org> Acked-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Richard Henderson <rth@twiddle.net> CC: Mikael Starvik <starvik@axis.com> Acked-by: David Howells <dhowells@redhat.com> CC: Yoshinori Sato <ysato@users.sourceforge.jp> CC: Tony Luck <tony.luck@intel.com> CC: Hirokazu Takata <takata@linux-m32r.org> CC: Geert Uytterhoeven <geert@linux-m68k.org> CC: Michal Simek <monstr@monstr.eu> Acked-by: Ralf Baechle <ralf@linux-mips.org> CC: Kyle McMartin <kyle@mcmartin.ca> CC: Martin Schwidefsky <schwidefsky@de.ibm.com> CC: Chen Liqin <liqin.chen@sunplusct.com> CC: "David S. Miller" <davem@davemloft.net> CC: Ingo Molnar <mingo@redhat.com> CC: Chris Zankel <chris@zankel.net> Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-03dt: add of_alias_scan and of_alias_get_idShawn Guo4-2/+141
The patch adds function of_alias_scan to populate a global lookup table with the properties of 'aliases' node and function of_alias_get_id for drivers to find alias id from the lookup table. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> [grant.likely: add locking and rework parse loop] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-08-03tcm_fc: Handle DDP/SW fc_frame_payload_get failures in ft_recv_write_dataKiran Patil3-49/+78
Problem: HW DDP context was not invalidated in case of ABORTS, etc... This leads to the problem where memory pages which are used for DDP as user descriptor could get reused for some other purpose (such as to satisfy new memory allocation request either by kernel or user mode threads) and since HW DDP context was not invalidated, HW continue to write to those pages, hence causing memory corruption. Fix: Either on incoming ABORTS or due to exchange time out, allowed the target to cleanup HW DDP context if it was setup for respective ft_cmd. Added new function to perform this cleanup, furthur it can be enhanced for other cleanup activity. Fix ft_recv_write_data() to properly handle fc_frame_payload_get to return pointer to payload if it exist. If there is no payload which is most common case (+ve case in case if DDP is working as expected, it will return NULL. Yes, scope of buf is limited to printk. Invalidation of HW context (which is done inside ft_invl_hw_context() is necessary in SUCCESS and FAILURE case of DDP. Hence invalidation is DONE as long as there was DDP setup (whether it worked correctly or not, NOTE: For some reason, if there is any error w.r.t DDP such as out of order packet reception, HW simply post the full packet in rx queue. Signed-off-by: Kiran Patil <kiran.patil@intel.com> Cc: Robert W Love <robert.w.love@intel.com> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
2011-08-02Input: ad7879 - fix deficient device disableMichael Hennerich1-1/+3
Input close or device disable should not interact with the exported gpiolib functionality. However that's the case. __ad7879_disable() clears the entire AD7879_REG_CTRL2, while it should just power down the ADC and its reference. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-08-02Input: gpio_keys - fix two typos in devicetree documentationTobias Klauser1-1/+1
Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-08-02tools/power turbostat: fit output into 80 columns on snb-epLen Brown1-23/+23
Reduce columns for package number to 1. If you can afford more than 9 packages, you can also afford a terminal with more than 80 columns:-) Also shave a column also off the package C-states Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-02efivars: fix warnings when CONFIG_PSTORE=nTony Luck1-3/+3
drivers/firmware/efivars.c:161: warning: ‘utf16_strlen’ defined but not used utf16_strlen() is only used inside CONFIG_PSTORE - make this "static inline" to shut the compiler up [thanks to hpa for the suggestion]. drivers/firmware/efivars.c:602: warning: initialization from incompatible pointer type Between v1 and v2 of this patch series we decided to make the "part" number unsigned - but missed fixing the stub version of efi_pstore_write() Acked-by: Matthew Garrett <mjg@redhat.com> Acked-by: Mike Waychison <mikew@google.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
2011-08-02ACPI: delete stale reference in kernel-parameters.txtLen Brown1-2/+0
Says for acpi= See also Documentation/power/pm.txt, pci=noacpi but this file does not exist Reported-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-02arch/tile/mm/init.c: trivial: use BUG_ONJulia Lawall1-2/+1
Use BUG_ON(x) rather than if(x) BUG(); The semantic patch that fixes this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier x; @@ -if (x) BUG(); +BUG_ON(x); @@ identifier x; @@ -if (!x) BUG(); +BUG_ON(!x); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2011-08-02ACPI: add missing _OSI stringsShaohua Li1-1/+7
Linux supports some optional features, but it should notify the BIOS about them via the _OSI method. Currently Linux doesn't notify any, which might make such features not work because the BIOS doesn't know about them. Jarosz has a system which needs this to make ACPI processor aggregator device work. Reported-by: "Jarosz, Sebastian" <sebastian.jarosz@intel.com> Signed-off-by: Shaohua Li <shaohua.li@intel.com> Acked-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-02ACPI: remove NID_INVALDavid Rientjes1-1/+0
b552a8c56db8 ("ACPI: remove NID_INVAL") removed the left over uses of NID_INVAL, but didn't actually remove the definition. Remove it. Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-02thermal: make THERMAL_HWMON implementation fully internalJean Delvare2-47/+92
THERMAL_HWMON is implemented inside the thermal_sys driver and has no effect on drivers implementing thermal zones, so they shouldn't see anything related to it in <linux/thermal.h>. Making the THERMAL_HWMON implementation fully internal has two advantages beyond the cleaner design: * This avoids rebuilding all thermal drivers if the THERMAL_HWMON implementation changes, or if CONFIG_THERMAL_HWMON gets enabled or disabled. * This avoids breaking the thermal kABI in these cases too, which should make distributions happy. The only drawback I can see is slightly higher memory fragmentation, as the number of kzalloc() calls will increase by one per thermal zone. But I doubt it will be a problem in practice, as I've never seen a system with more than two thermal zones. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Rene Herman <rene.herman@gmail.com> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-02thermal: split hwmon lookup to a separate functionJean Delvare1-6/+19
We'll soon need to reuse it. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Rene Herman <rene.herman@gmail.com> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-02thermal: hide CONFIG_THERMAL_HWMONJean Delvare2-15/+2
It's about time to revert 16d752397301b9 ("thermal: Create CONFIG_THERMAL_HWMON=n"). Anybody running a kernel >= 2.6.40 would also be running a recent enough version of lm-sensors. Actually having CONFIG_THERMAL_HWMON is pretty convenient so instead of dropping it, we keep it but hide it. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Rene Herman <rene.herman@gmail.com> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
2011-08-02MAINTAINERS: Add keyword match for of_match_table to device tree sectionMark Brown1-0/+1
If a patch is working with an of_match_table it's probably adding an OF binding to a driver in which case the binding ought to be reviewed by the device tree folks to make sure that things like the device matches are set up correctly. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-08-02of: constify property name parameters for helper functionsJamie Iles2-9/+13
The helper functions for reading u32 integers, u32 arrays and strings should have the property name as a const pointer. Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Jamie Iles <jamie@jamieiles.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-08-02spi/pl022: remove function cannot exitLinus Walleij1-8/+3
The remove function in the PL022 driver cannot abort the remove function any way, so restructure the code so as not to make that assumption. Remove will now proceed no matter whether it can stop the transfer queue or not. Reported-by: Russell King <linux@arm.linux.org.uk> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-08-02dm table: set flush capability based on underlying devicesMike Snitzer2-1/+43
DM has always advertised both REQ_FLUSH and REQ_FUA flush capabilities regardless of whether or not a given DM device's underlying devices also advertised a need for them. Block's flush-merge changes from 2.6.39 have proven to be more costly for DM devices. Performance regressions have been reported even when DM's underlying devices do not advertise that they have a write cache. Fix the performance regressions by configuring a DM device's flushing capabilities based on those of the underlying devices' capabilities. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm crypt: optionally support discard requestsMilan Broz2-5/+65
Add optional parameter field to dmcrypt table and support "allow_discards" option. Discard requests bypass crypt queue processing. Bio is simple remapped to underlying device. Note that discard will be never enabled by default because of security consequences. It is up to the administrator to enable it for encrypted devices. (Note that userspace cryptsetup does not understand new optional parameters yet. Support for this will come later. Until then, you should use 'dmsetup' to enable and disable this.) Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm raid: add md raid1 supportJonathan Brassow1-10/+39
Support the MD RAID1 personality through dm-raid. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm raid: support metadata devicesJonathan Brassow3-24/+412
Add the ability to parse and use metadata devices to dm-raid. Although not strictly required, without the metadata devices, many features of RAID are unavailable. They are used to store a superblock and bitmap. The role, or position in the array, of each device must be recorded in its superblock. This is to help with fault handling, array reshaping, and sanity checks. RAID 4/5/6 devices must be loaded in a specific order: in this way, the 'array_position' field helps validate the correctness of the mapping when it is loaded. It can be used during reshaping to identify which devices are added/removed. Fault handling is impossible without this field. For example, when a device fails it is recorded in the superblock. If this is a RAID1 device and the offending device is removed from the array, there must be a way during subsequent array assembly to determine that the failed device was the one removed. This is done by correlating the 'array_position' field and the bit-field variable 'failed_devices'. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm raid: add write_mostly parameterJonathan Brassow2-2/+28
Add the write_mostly parameter to RAID1 dm-raid tables. This allows the user to set the WriteMostly flag on a RAID1 device that should normally be avoided for read I/O. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm raid: add region_size parameterJonathan Brassow2-3/+83
Allow the user to specify the region_size. Ensures that the supplied value meets md's constraints, viz. the number of regions does not exceed 2^21. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm raid: improve table parameters documentationJonathan Brassow1-46/+78
Add more information about some dm-raid table parameters and clarify how parameters are printed when 'dmsetup table' is issued. Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm ioctl: forbid multiple device specifiersMikulas Patocka1-0/+6
Exactly one of name, uuid or device must be specified when referencing an existing device. This removes the ambiguity (risking the wrong device being updated) if two conflicting parameters were specified. Previously one parameter got used and any others were ignored silently. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm ioctl: introduce __get_dev_cellMikulas Patocka1-17/+24
Move logic to find device based on major/minor number to a separate function __get_dev_cell (similar to __get_uuid_cell and __get_name_cell). This makes the function __find_device_hash_cell more straightforward. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm ioctl: fill in device parameters in more ioctlsMikulas Patocka2-29/+38
Move parameter filling from find_device to __find_device_hash_cell. This patch causes ioctls using __find_device_hash_cell (DM_DEV_REMOVE_CMD, DM_DEV_SUSPEND_CMD - resume, DM_TABLE_CLEAR_CMD) to return device parameters, bringing them into line with the other ioctls. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm flakey: add corrupt_bio_byte featureMike Snitzer2-15/+159
Add corrupt_bio_byte feature to simulate corruption by overwriting a byte at a specified position with a specified value during intervals when the device is "down". Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm flakey: add drop_writesMike Snitzer2-14/+78
Add 'drop_writes' option to drop writes silently while the device is 'down'. Reads are not touched. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm flakey: support feature argsMike Snitzer1-19/+64
Add the ability to specify arbitrary feature flags when creating a flakey target. This code uses the same target argument helpers that the multipath target does. Also remove the superfluous 'dm-flakey' prefixes from the error messages, as they already contain the prefix 'flakey'. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm flakey: use dm_target_offset and support discardsMike Snitzer1-1/+2
Use dm_target_offset() and support discards. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm table: share target argument parsing functionsMike Snitzer4-112/+147
Move multipath target argument parsing code into dm-table so other targets can share it. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm snapshot: skip reading origin when overwriting complete chunkMikulas Patocka3-3/+103
If we write a full chunk in the snapshot, skip reading the origin device because the whole chunk will be overwritten anyway. This patch changes the snapshot write logic when a full chunk is written. In this case: 1. allocate the exception 2. dispatch the bio (but don't report the bio completion to device mapper) 3. write the exception record 4. report bio completed Callbacks must be done through the kcopyd thread, because callbacks must not race with each other. So we create two new functions: dm_kcopyd_prepare_callback: allocate a job structure and prepare the callback. (This function must not be called from interrupt context.) dm_kcopyd_do_callback: submit callback. (This function may be called from interrupt context.) Performance test (on snapshots with 4k chunk size): without the patch: non-direct-io sequential write (dd): 17.7MB/s direct-io sequential write (dd): 20.9MB/s non-direct-io random write (mkfs.ext2): 0.44s with the patch: non-direct-io sequential write (dd): 26.5MB/s direct-io sequential write (dd): 33.2MB/s non-direct-io random write (mkfs.ext2): 0.27s Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm: ignore merge_bvec for snapshots when safeMikulas Patocka3-2/+64
Add a new flag DMF_MERGE_IS_OPTIONAL to struct mapped_device to indicate whether the device can accept bios larger than the size its merge function returns. When set, use this to send large bios to snapshots which can split them if necessary. Snapshot I/O may be significantly fragmented and this approach seems to improve peformance. Before the patch, dm_set_device_limits restricted bio size to page size if the underlying device had a merge function and the target didn't provide a merge function. After the patch, dm_set_device_limits restricts bio size to page size if the underlying device has a merge function, doesn't have DMF_MERGE_IS_OPTIONAL flag and the target doesn't provide a merge function. The snapshot target can't provide a merge function because when the merge function is called, it is impossible to determine where the bio will be remapped. Previously this led us to impose a 4k limit, which we can now remove if the snapshot store is located on a device without a merge function. Together with another patch for optimizing full chunk writes, it improves performance from 29MB/s to 40MB/s when writing to the filesystem on snapshot store. If the snapshot store is placed on a non-dm device with a merge function (such as md-raid), device mapper still limits all bios to page size. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm table: clean dm_get_device and move exportsMike Snitzer1-20/+13
There is no need for __table_get_device to be factored out. Also move the exports to the end of their respective functions. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm raid: tidy includesAlasdair G Kergon1-1/+2
A dm target only needs to use include/linux dm headers. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm ioctl: prevent empty messageAlasdair G Kergon1-0/+5
Detect invalid empty messages in core dm instead of requiring every target to check this. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm raid: cleanup parameter handlingJonathan Brassow1-19/+23
Re-order the parameters so they are handled consistently in the same order where defined, parsed and output. Only include rebuild parameters in the STATUSTYPE_TABLE output if they were supplied in the original table line. Correct the parameter count when outputting rebuild: there are two words, not one. Use case-independent checks for keywords (as in other device-mapper targets). Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm snapshot: style cleanupsJonathan Brassow2-10/+8
Coding style cleanups. Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
2011-08-02dm snapshot: remove unused definitionsMikulas Patocka1-10/+0
Remove a couple of unused #defines. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm kcopyd: remove nr_pages field from job structureMikulas Patocka1-4/+2
The nr_pages field in struct kcopyd_job is only used temporarily in run_pages_job() to count the number of required pages. We can use a local variable instead. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm kcopyd: remove offset field from job structureMikulas Patocka1-5/+2
The offset field in struct kcopyd_job is always zero so remove it. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm: use vzallocJoe Perches3-7/+3
Use vzalloc() instead of vmalloc()+memset(). Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm log: userspace use list_moveKirill A. Shutemov1-2/+1
Replace list_del() followed by list_add() with list_move(). Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm log: clean up bit little endian bitopsAkinobu Mita1-5/+4
Using __test_and_{set,clear}_bit_le() with ignoring its return value can be replaced with __{set,clear}_bit_le(). This also removes unnecessary casts. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm table: fix discard supportMike Snitzer2-9/+9
Remove 'discards_supported' from the dm_table structure. The same information can be easily discovered from the table's target(s) in dm_table_supports_discards(). Before this fix dm_table_supports_discards() would skip checking the individual targets' 'discards_supported' flag if any one target in the table didn't set num_discard_requests > 0. Now the per-target 'discards_supported' flag is effective at insuring the final DM device advertises discard support. But, to be clear, targets that don't support discards (!num_discard_requests) will not receive discard requests. Also DMWARN if a target sets 'discards_supported' override but forgets to set 'num_discard_requests'. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm: suppress endian warningsAlasdair G Kergon3-43/+54
Suppress sparse warnings about cpu_to_le32() by using __le32 types for on-disk data etc. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm: fix idr leak on module removalAlasdair G Kergon1-2/+8
Destroy _minor_idr when unloading the core dm module. (Found by kmemleak.) Cc: stable@kernel.org Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm io: flush cpu cache with vmapped ioMikulas Patocka1-2/+27
For normal kernel pages, CPU cache is synchronized by the dma layer. However, this is not done for pages allocated with vmalloc. If we do I/O to/from vmallocated pages, we must synchronize CPU cache explicitly. Prior to doing I/O on vmallocated page we must call flush_kernel_vmap_range to flush dirty cache on the virtual address. After finished read we must call invalidate_kernel_vmap_range to invalidate cache on the virtual address, so that accesses to the virtual address return newly read data and not stale data from CPU cache. This patch fixes metadata corruption on dm-snapshots on PA-RISC and possibly other architectures with caches indexed by virtual address. Cc: stable <stable@kernel.org> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2011-08-02dm mpath: fix potential NULL pointer in feature arg processingMike Snitzer1-0/+5
Avoid dereferencing a NULL pointer if the number of feature arguments supplied is fewer than indicated. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Cc: stable@kernel.org
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