- 17 Jul, 2012 1 commit
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Heiko Carstens authored
The s390 idle accounting code uses a sequence counter which gets used when the per cpu idle statistics get updated and read. One assumption on read access is that only when the sequence counter is even and did not change while reading all values the result is valid. On cpu hotplug however the per cpu data structure gets initialized via a cpu hotplug notifier on CPU_ONLINE. CPU_ONLINE however is too late, since the onlined cpu is already running and might access the per cpu data. Worst case is that the data structure gets initialized while an idle thread is updating its idle statistics. This will result in an uneven sequence counter after an update. As a result user space tools like top, which access /proc/stat in order to get idle stats, will busy loop waiting for the sequence counter to become even again, which will never happen until the queried cpu will update its idle statistics again. And even then the sequence counter will only have an even value for a couple of cpu cycles. Fix this by moving the initialization of the per cpu idle statistics to cpu_init(). I prefer that solution in favor of changing the notifier to CPU_UP_PREPARE, which would be a different solution to the problem. Cc: stable@vger.kernel.org Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 16 Jul, 2012 3 commits
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Holger Dengler authored
The adapter interrupt for an APQN must be re-enabled after a reset. This patch sends the interrupt enablement request again, if the APQN is busy or the reset is still in progress. Signed-off-by: Holger Dengler <hd@linux.vnet.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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Michael Holzheu authored
With git commit 85fe4025 ("fs: do not assign default i_ino in new_inode") the get_next_ino() function was moved from the new_inode() to the different file system implementations. Unfortunately hypfs has been overlooked by the author. With this patch the get_next_ino() is added also to hypfs. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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Stefan Haberland authored
Add a mechanism to wait for outstanding IO during shutdown. Schedule the block_bh and device_bh and wait until our request queues are empty. Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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- 27 Jun, 2012 1 commit
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Michael Holzheu authored
Fix problem that was introduced with patch "s390/smp: make absolute lowcore / cpu restart parameter". After that patch the "dumpreipl" shutdown action does not work any more. To fix the problem we have to assign "reipl_block_actual" instead of "&reipl_block_actual" Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 14 Jun, 2012 1 commit
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Heiko Carstens authored
Setting the cpu restart parameters is done in three different fashions: - directly setting the four parameters individually - copying the four parameters with memcpy (using 4 * sizeof(long)) - copying the four parameters using a private structure In addition code in entry*.S relies on a certain order of the restart members of struct _lowcore. Make all of this more robust to future changes by adding a mem_absolute_assign(dest, val) define, which assigns val to dest using absolute addressing mode. Also the load multiple instructions in entry*.S have been split into separate load instruction so the order of the struct _lowcore members doesn't matter anymore. In addition move the prototypes of memcpy_real/absolute from uaccess.h to processor.h. These memcpy* variants are not related to uaccess at all. string.h doesn't seem to match as well, so lets use processor.h. Also replace the eight byte array in struct _lowcore which represents a misaliged u64 with a u64. The compiler will always create code that handles the misaligned u64 correctly. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 05 Jun, 2012 9 commits
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Sebastian Ott authored
Let the driver core handle driver attribute creation and removal. This will simplify the code and eliminates races between attribute availability and userspace notification via uevents. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Sebastian Ott authored
Let the driver core handle device attribute creation and removal. This will simplify the code and eliminates races between attribute availability and userspace notification via uevents. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Sebastian Ott authored
The creator_id is no longer used. Just get rid of it. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Sebastian Ott authored
Let the driver core handle device attribute creation and removal. This will simplify the code and eliminates races between attribute availability and userspace notification via uevents. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
Use sigp order code defines in assembly code as well. With this change all places that use sigp constants should have been converted to use self describing defines instead of directly using constants. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
We got them from the kvm code, so let's use them. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
The smp and the kvm code have different defines for the sigp order codes. Let's just have a single place where these are defined. Also move the sigp condition code and sigp cpu status bits to the new sigp.h header file. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Heiko Carstens authored
condition code "status stored" for sigp sense running always implies that only the "not running" status bit is set. Therefore no need to check if it is set. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Christian Borntraeger authored
After commit 5e8010cb s390: replace TIF_SIE with PF_VCPU there is no need to load the thread info before sie_loop where it is also loaded. Get rid of this duplicate instruction. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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- 04 Jun, 2012 12 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/{signal,vfs}Linus Torvalds authored
Pull signal and vfs compile breakage fixes from Al Viro. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: fixups for signal breakage * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: nommu: fix compilation of nommu.c
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git://git.samba.org/sfrench/cifs-2.6Linus Torvalds authored
Pull cifs fixes from Steve French. * 'for-next' of git://git.samba.org/sfrench/cifs-2.6: CIFS: Move get_next_mid to ops struct CIFS: Make accessing is_valid_oplock/dump_detail ops struct field safe CIFS: Improve identation in cifs_unlock_range CIFS: Fix possible wrong memory allocation
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Al Viro authored
Obvious brainos spotted by Geert. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Greg Ungerer authored
Compiling 3.5-rc1 for nommu targets gives: CC mm/nommu.o mm/nommu.c: In function ‘sys_mmap_pgoff’: mm/nommu.c:1489:2: error: ‘ret’ undeclared (first use in this function) mm/nommu.c:1489:2: note: each undeclared identifier is reported only once for each function it appears in It is trivially fixed by replacing 'ret' with the local variable that is already defined for the return value 'retval'. Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mmLinus Torvalds authored
Pull frontswap feature from Konrad Rzeszutek Wilk: "Frontswap provides a "transcendent memory" interface for swap pages. In some environments, dramatic performance savings may be obtained because swapped pages are saved in RAM (or a RAM-like device) instead of a swap disk. This tag provides the basic infrastructure along with some changes to the existing backends." Fix up trivial conflict in mm/Makefile due to removal of swap token code changing a line next to the new frontswap entry. This pull request came in before the merge window even opened, it got delayed to after the merge window by me just wanting to make sure it had actual users. Apparently IBM is using this on their embedded side, and Jan Beulich says that it's already made available for SLES and OpenSUSE users. Also acked by Rik van Riel, and Konrad points to other people liking it too. So in it goes. By Dan Magenheimer (4) and Konrad Rzeszutek Wilk (2) via Konrad Rzeszutek Wilk * tag 'stable/frontswap.v16-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/mm: frontswap: s/put_page/store/g s/get_page/load MAINTAINER: Add myself for the frontswap API mm: frontswap: config and doc files mm: frontswap: core frontswap functionality mm: frontswap: core swap subsystem hooks and headers mm: frontswap: add frontswap header file
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Linus Torvalds authored
Merge branches 'irq-urgent-for-linus' and 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull irq and smpboot updates from Thomas Gleixner: "Just cleanup patches with no functional change and a fix for suspend issues." * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: genirq: Introduce irq_do_set_affinity() to reduce duplicated code genirq: Add IRQS_PENDING for nested and simple irq * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: smpboot, idle: Fix comment mismatch over idle_threads_init() smpboot, idle: Optimize calls to smp_processor_id() in idle_threads_init()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull timer updates from Thomas Gleixner: "The clocksource driver is pure hardware enablement and the skew option is default off, well tested and non dangerous." * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: tick: Move skew_tick option into the HIGH_RES_TIMER section clocksource: em_sti: Add DT support clocksource: em_sti: Emma Mobile STI driver clockevents: Make clockevents_config() a global symbol tick: Add tick skew boot option
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Linus Torvalds authored
Cyrill Gorcunov reports that I broke the fdinfo files with commit 30a08bf2 ("proc: move fd symlink i_mode calculations into tid_fd_revalidate()"), and he's quite right. The tid_fd_revalidate() function is not just used for the <tid>/fd symlinks, it's also used for the <tid>/fdinfo/<fd> files, and the permission model for those are different. So do the dynamic symlink permission handling just for symlinks, making the fdinfo files once more appear as the proper regular files they are. Of course, Al Viro argued (probably correctly) that we shouldn't do the symlink permission games at all, and make the symlinks always just be the normal 'lrwxrwxrwx'. That would have avoided this issue too, but since somebody noticed that the permissions had changed (which was the reason for that original commit 30a08bf2 in the first place), people do apparently use this feature. [ Basically, you can use the symlink permission data as a cheap "fdinfo" replacement, since you see whether the file is open for reading and/or writing by just looking at st_mode of the symlink. So the feature does make sense, even if the pain it has caused means we probably shouldn't have done it to begin with. ] Reported-and-tested-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Kukjin Kim authored
Should be 'exynos5_xxx' instead of 'exonys5_xxx'. It happened at the commit 30b84288 ("Merge tag 'soc2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc") during v3.5 merge window. Signed-off-by: Kukjin Kim <kgene.kim@samsung.com> [ My bad - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmLinus Torvalds authored
Pull some left-over PM patches from Rafael J. Wysocki. * 'pm-acpi' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: ACPI / PM: Make acpi_pm_device_sleep_state() follow the specification ACPI / PM: Make __acpi_bus_get_power() cover D3cold correctly ACPI / PM: Fix error messages in drivers/acpi/bus.c rtc-cmos / PM: report wakeup event on ACPI RTC alarm ACPI / PM: Generate wakeup events on fixed power button
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Linus Torvalds authored
This reverts commit 5ceb9ce6. That commit seems to be the cause of the mm compation list corruption issues that Dave Jones reported. The locking (or rather, absense there-of) is dubious, as is the use of the 'page' variable once it has been found to be outside the pageblock range. So revert it for now, we can re-visit this for 3.6. If we even need to: as Minchan Kim says, "The patch wasn't a bug fix and even test workload was very theoretical". Reported-and-tested-by: Dave Jones <davej@redhat.com> Acked-by: Hugh Dickins <hughd@google.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Hugh Dickins authored
New tmpfs use of !PageUptodate pages for fallocate() is triggering the WARNING: at mm/page-writeback.c:1990 when __set_page_dirty_nobuffers() is called from migrate_page_copy() for compaction. It is anomalous that migration should use __set_page_dirty_nobuffers() on an address_space that does not participate in dirty and writeback accounting; and this has also been observed to insert surprising dirty tags into a tmpfs radix_tree, despite tmpfs not using tags at all. We should probably give migrate_page_copy() a better way to preserve the tag and migrate accounting info, when mapping_cap_account_dirty(). But that needs some more work: so in the interim, avoid the warning by using a simple SetPageDirty on PageSwapBacked pages. Reported-and-tested-by: Dave Jones <davej@redhat.com> Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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- 03 Jun, 2012 3 commits
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Linus Torvalds authored
The comment above it says "Stat data, not accessed from path walking", but in fact some of inode fields we use for the common stat data was way down at the end of the inode, causing unnecessary cache misses for the common stat operations. The inode structure is pretty big, and this can change padding depending on field width, but at least on the common 64-bit configurations this doesn't change the size. Some of our inode layout has historically been to tro to avoid unnecessary padding fields, but cache locality is at least as important for layout, if not more. Noticed by looking at kernel profiles, and noticing that the "i_blkbits" access stood out like a sore thumb. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dmLinus Torvalds authored
Pull device-mapper updates from Alasdair G Kergon: "Improve multipath's retrying mechanism in some defined circumstances and provide a simple reserve/release mechanism for userspace tools to access thin provisioning metadata while the pool is in use." * tag 'dm-3.5-changes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm: dm thin: provide userspace access to pool metadata dm thin: use slab mempools dm mpath: allow ioctls to trigger pg init dm mpath: delay retry of bypassed pg dm mpath: reduce size of struct multipath
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- 02 Jun, 2012 10 commits
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Joe Thornber authored
This patch implements two new messages that can be sent to the thin pool target allowing it to take a snapshot of the _metadata_. This, read-only snapshot can be accessed by userland, concurrently with the live target. Only one metadata snapshot can be held at a time. The pool's status line will give the block location for the current msnap. Since version 0.1.5 of the userland thin provisioning tools, the thin_dump program displays the msnap as follows: thin_dump -m <msnap root> <metadata dev> Available here: https://github.com/jthornber/thin-provisioning-tools Now that userland can access the metadata we can do various things that have traditionally been kernel side tasks: i) Incremental backups. By using metadata snapshots we can work out what blocks have changed over time. Combined with data snapshots we can ensure the data doesn't change while we back it up. A short proof of concept script can be found here: https://github.com/jthornber/thinp-test-suite/blob/master/incremental_backup_example.rb ii) Migration of thin devices from one pool to another. iii) Merging snapshots back into an external origin. iv) Asyncronous replication. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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Mike Snitzer authored
Use dedicated caches prefixed with a "dm_" name rather than relying on kmalloc mempools backed by generic slab caches so the memory usage of thin provisioning (and any leaks) can be accounted for independently. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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Mikulas Patocka authored
After the failure of a group of paths, any alternative paths that need initialising do not become available until further I/O is sent to the device. Until this has happened, ioctls return -EAGAIN. With this patch, new paths are made available in response to an ioctl too. The processing of the ioctl gets delayed until this has happened. Instead of returning an error, we submit a work item to kmultipathd (that will potentially activate the new path) and retry in ten milliseconds. Note that the patch doesn't retry an ioctl if the ioctl itself fails due to a path failure. Such retries should be handled intelligently by the code that generated the ioctl in the first place, noting that some SCSI commands should not be retried because they are not idempotent (XOR write commands). For commands that could be retried, there is a danger that if the device rejected the SCSI command, the path could be errorneously marked as failed, and the request would be retried on another path which might fail too. It can be determined if the failure happens on the device or on the SCSI controller, but there is no guarantee that all SCSI drivers set these flags correctly. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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Mike Christie authored
If I/O needs retrying and only bypassed priority groups are available, set the pg_init_delay_retry flag to wait before retrying. If, for example, the reason for the bypass is that the controller is getting reset or there is a firmware upgrade happening, retrying right away would cause a flood of log messages and retries for what could be a few seconds or even several minutes. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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Mike Snitzer authored
Move multipath structure's 'lock' and 'queue_size' members to eliminate two 4-byte holes. Also use a bit within a single unsigned int for each existing flag (saves 8-bytes). This allows future flags to be added without each consuming an unsigned int. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Acked-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking updates from David Miller: 1) Make syn floods consume significantly less resources by a) Not pre-COW'ing routing metrics for SYN/ACKs b) Mirroring the device queue mapping of the SYN for the SYN/ACK reply. Both from Eric Dumazet. 2) Fix calculation errors in Byte Queue Limiting, from Hiroaki SHIMODA. 3) Validate the length requested when building a paged SKB for a socket, so we don't overrun the page vector accidently. From Jason Wang. 4) When netlabel is disabled, we abort all IP option processing when we see a CIPSO option. This isn't the right thing to do, we should simply skip over it and continue processing the remaining options (if any). Fix from Paul Moore. 5) SRIOV fixes for the mellanox driver from Jack orgenstein and Marcel Apfelbaum. 6) 8139cp enables the receiver before the ring address is properly programmed, which potentially lets the device crap over random memory. Fix from Jason Wang. 7) e1000/e1000e fixes for i217 RST handling, and an improper buffer address reference in jumbo RX frame processing from Bruce Allan and Sebastian Andrzej Siewior, respectively. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: fec_mpc52xx: fix timestamp filtering mcs7830: Implement link state detection e1000e: fix Rapid Start Technology support for i217 e1000: look into the page instead of skb->data for e1000_tbi_adjust_stats() r8169: call netif_napi_del at errpaths and at driver unload tcp: reflect SYN queue_mapping into SYNACK packets tcp: do not create inetpeer on SYNACK message 8139cp/8139too: terminate the eeprom access with the right opmode 8139cp: set ring address before enabling receiver cipso: handle CIPSO options correctly when NetLabel is disabled net: sock: validate data_len before allocating skb in sock_alloc_send_pskb() bql: Avoid possible inconsistent calculation. bql: Avoid unneeded limit decrement. bql: Fix POSDIFF() to integer overflow aware. net/mlx4_core: Fix obscure mlx4_cmd_box parameter in QUERY_DEV_CAP net/mlx4_core: Check port out-of-range before using in mlx4_slave_cap net/mlx4_core: Fixes for VF / Guest startup flow net/mlx4_en: Fix improper use of "port" parameter in mlx4_en_event net/mlx4_core: Fix number of EQs used in ICM initialisation net/mlx4_core: Fix the slave_id out-of-range test in mlx4_eq_int
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull straggler x86 fixes from Peter Anvin: "Three groups of patches: - EFI boot stub documentation and the ability to print error messages; - Removal for PTRACE_ARCH_PRCTL for x32 (obsolete interface which should never have been ported, and the port is broken and potentially dangerous.) - ftrace stack corruption fixes. I'm not super-happy about the technical implementation, but it is probably the least invasive in the short term. In the future I would like a single method for nesting the debug stack, however." * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, x32, ptrace: Remove PTRACE_ARCH_PRCTL for x32 x86, efi: Add EFI boot stub documentation x86, efi; Add EFI boot stub console support x86, efi: Only close open files in error path ftrace/x86: Do not change stacks in DEBUG when calling lockdep x86: Allow nesting of the debug stack IDT setting x86: Reset the debug_stack update counter ftrace: Use breakpoint method to update ftrace caller ftrace: Synchronize variable setting with breakpoints
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Linus Torvalds authored
This reverts the tty layer change to use per-tty locking, because it's not correct yet, and fixing it will require some more deep surgery. The main revert is d29f3ef3 ("tty_lock: Localise the lock"), but there are several smaller commits that built upon it, they also get reverted here. The list of reverted commits is: fde86d31 - tty: add lockdep annotations 8f6576ad - tty: fix ldisc lock inversion trace d3ca8b64 - pty: Fix lock inversion b1d679af - tty: drop the pty lock during hangup abcefe5f - tty/amiserial: Add missing argument for tty_unlock() fd11b42e - cris: fix missing tty arg in wait_event_interruptible_tty call d29f3ef3 - tty_lock: Localise the lock The revert had a trivial conflict in the 68360serial.c staging driver that got removed in the meantime. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Stephan Gatzka authored
skb_defer_rx_timestamp was called with a freshly allocated skb but must be called with rskb instead. Signed-off-by: Stephan Gatzka <stephan@gatzka.org> Cc: stable <stable@vger.kernel.org> Acked-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Ondrej Zary authored
Add .status callback that detects link state changes. Tested with MCS7832CV-AA chip (9710:7830, identified as rev.C by the driver). Fixes https://bugzilla.kernel.org/show_bug.cgi?id=28532Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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