- 11 Sep, 2016 1 commit
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Trond Myklebust authored
Ensure that we conform to the algorithm described in RFC5661, section 18.36.4 for when to bump the sequence id. In essence we do it for all cases except when the RPC call timed out, or in case of the server returning NFS4ERR_DELAY or NFS4ERR_STALE_CLIENTID. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org
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- 06 Sep, 2016 2 commits
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Chuck Lever authored
An RPC can terminate before its reply arrives, if a credential problem or a soft timeout occurs. After this happens, xprtrdma reports it is out of Receive buffers. A Receive buffer is posted before each RPC is sent, and returned to the buffer pool when a reply is received. If no reply is received for an RPC, that Receive buffer remains posted. But xprtrdma tries to post another when the next RPC is sent. If this happens a few dozen times, there are no receive buffers left to be posted at send time. I don't see a way for a transport connection to recover at that point, and it will spit warnings and unnecessarily delay RPCs on occasion for its remaining lifetime. Commit 1e465fd4 ("xprtrdma: Replace send and receive arrays") removed a little bit of logic to detect this case and not provide a Receive buffer so no more buffers are posted, and then transport operation continues correctly. We didn't understand what that logic did, and it wasn't commented, so it was removed as part of the overhaul to support backchannel requests. Restore it, but be wary of the need to keep extra Receives posted to deal with backchannel requests. Fixes: 1e465fd4 ("xprtrdma: Replace send and receive arrays") Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Chuck Lever authored
Receive buffer exhaustion, if it were to actually occur, would be catastrophic. However, when there are no reply buffers to post, that means all of them have already been posted and are waiting for incoming replies. By design, there can never be more RPCs in flight than there are available receive buffers. A receive buffer can be left posted after an RPC exits without a received reply; say, due to a credential problem or a soft timeout. This does not result in fewer posted receive buffers than there are pending RPCs, and there is already logic in xprtrdma to deal appropriately with this case. It also looks like the "+ 2" that was removed was accidentally accommodating the number of extra receive buffers needed for receiving backchannel requests. That will need to be addressed by another patch. Fixes: 3d4cf35b ("xprtrdma: Reply buffer exhaustion can be...") Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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- 04 Sep, 2016 1 commit
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Trond Myklebust authored
If there are outstanding LAYOUTGET rpc calls, then we want to ensure that we keep the layout stateid around so we that don't inadvertently pick up an old/misordered sequence id. The race is as follows: Client Server ====== ====== LAYOUTGET(seqid) LAYOUTGET(seqid) return LAYOUTGET(seqid+1) return LAYOUTGET(seqid+2) process LAYOUTGET(seqid+2) forget layout process LAYOUTGET(seqid+1) If it forgets the layout stateid before processing seqid+1, then the client will not check the layout->plh_barrier, and so will set the stateid with seqid+1. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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- 03 Sep, 2016 5 commits
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Trond Myklebust authored
If the server fails to set lrp->res.lrs_present in the LAYOUTRETURN reply, then that means it believes the client holds no more layout state for that file, and that the layout stateid is now invalid. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
If the layout was marked as invalid, we want to ensure to initialise the layout header fields correctly. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
According to RFC5661, the client is responsible for serialising LAYOUTGET and LAYOUTRETURN to avoid ambiguity. Consider the case where we send both in parallel. Client Server ====== ====== LAYOUTGET(seqid=X) LAYOUTRETURN(seqid=X) LAYOUTGET return seqid=X+1 LAYOUTRETURN return seqid=X+2 Process LAYOUTRETURN Forget layout stateid Process LAYOUTGET Set seqid=X+1 The client processes the layoutget/layoutreturn in the wrong order, and since the result of the layoutreturn was to clear the only existing layout segment, the client forgets the layout stateid. When the LAYOUTGET comes in, it is treated as having a completely new stateid, and so the client sets the wrong sequence id... Fix is to check if there are outstanding LAYOUTGET requests before we send the LAYOUTRETURN (note that LAYOUGET will already wait if it sees an outstanding LAYOUTRETURN). Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org # v4.5+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
When doing O_DSYNC writes, the actual write errors are reported through generic_write_sync(), so we must test the result. Reported-by: J. R. Okajima <hooanon05g@gmail.com> Fixes: 18290650 ("NFS: Move buffered I/O locking into nfs_file_write()") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Paolo Abeni authored
The commit f9b2ee71 ("SUNRPC: Move UDP receive data path into a workqueue context"), as a side effect, moved the skb_free_datagram() call outside the scope of the related socket lock, but UDP sockets require such lock to be held for proper memory accounting. Fix it by replacing skb_free_datagram() with skb_free_datagram_locked(). Fixes: f9b2ee71 ("SUNRPC: Move UDP receive data path into a workqueue context") Reported-and-tested-by: Jan Stancek <jstancek@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Cc: stable@vger.kernel.org # 4.4+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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- 30 Aug, 2016 2 commits
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Trond Myklebust authored
On error, the callers expect us to return without bumping nn->cb_users[]. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org # v3.7+
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Benjamin Coddington authored
If a server returns itself as a location while migrating, the client may end up getting stuck attempting to migrate twice to the same server. Catch this by checking if the nfs_client found is the same as the existing client. For the other two callers to nfs4_set_client, the nfs_client will always be ERR_PTR(-EINVAL). Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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- 29 Aug, 2016 1 commit
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Trond Myklebust authored
If the attempt to connect to a DS fails inside ff_layout_pg_init_read or ff_layout_pg_init_write, then we currently end up clearing the layout segment carried by the struct nfs_pageio_descriptor, causing an Oops when we later call into ff_layout_read_pagelist/ff_layout_write_pagelist. The fix is to ensure we return the layout and then retry. Fixes: 446ca219 ("pNFS/flexfiles: When initing reads or writes, we...") Cc: stable@vger.kernel.org # v4.7+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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- 28 Aug, 2016 5 commits
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Trond Myklebust authored
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
Defer freeing the slot until after we have processed the results from OPEN and LAYOUTGET. This means that the server can rely on the mechanism in RFC5661 Section 2.10.6.3 to ensure that replies to an OPEN or LAYOUTGET/RETURN RPC call don't race with the callbacks that apply to them. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
For operations like OPEN or LAYOUTGET, which return recallable state (i.e. delegations and layouts) we want to enable the mechanism for resolving recall races in RFC5661 Section 2.10.6.3. To do so, we will want to defer bumping the slot's sequence number until we have finished processing the RPC results. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
If CB_SEQUENCE tells us that the processing of this request depends on the completion of one or more referring triples (see RFC 5661 Section 2.10.6.3), delay the callback processing until after the RPC requests being referred to have completed. If we end up delaying for more than 1/2 second, then fall back to returning NFS4ERR_DELAY in reply to the callback. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
The slot table hasn't been an array since v3.7. Ensure that we use nfs4_lookup_slot() to access the slot correctly. Fixes: 87dda67e ("NFSv4.1: Allow SEQUENCE to resize the slot table...") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org # v3.8+
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- 25 Aug, 2016 1 commit
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Chuck Lever authored
Using NFSv4.1 on RDMA should be safe, so broaden the new checks in rpc_create(). WARN_ON_ONCE is used, matching most other WARN call sites in clnt.c. Fixes: 39a9beab ("rpc: share one xps between all backchannels") Fixes: d50039ea ("nfsd4/rpc: move backchannel create logic...") Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: J. Bruce Fields <bfields@fieldses.org> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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- 23 Aug, 2016 2 commits
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Benjamin Coddington authored
Block/SCSI layout write completion may add committable extents to the extent tree before updating the layout's last-written byte under the inode lock. If a sync happens before this value is updated, then prepare_layoutcommit may find and encode these extents which would produce a LAYOUTCOMMIT request whose encoded extents are larger than the request's loca_length. Fix this by using a last-written byte value that is updated atomically with the extent tree so that commitable extents always match. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
Ensure that the client conforms to the normative behaviour described in RFC5661 Section 12.7.2: "If a client believes its lease has expired, it MUST NOT send I/O to the storage device until it has validated its lease." So ensure that we wait for the lease to be validated before using the layout. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Cc: stable@vger.kernel.org # v3.20+
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- 19 Aug, 2016 1 commit
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Trond Myklebust authored
We normally want to update the stateid and then retry, Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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- 16 Aug, 2016 2 commits
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Trond Myklebust authored
Prior to this patch, the retrans value was set at 5, meaning that we could see a maximum retransmission timeout value of more than 6 minutes. That's a tad high for NFSv3 where the protocol does allow the server to drop requests at any time. Since this is a data channel, let's just set retrans to 0, and the default timeout to 60s. The user can continue to adjust these defaults using the dataserver_retrans and dataserver_timeo module parameters. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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Trond Myklebust authored
We should allow retrans=0 as just meaning that every timeout is a major timeout, and that there is no increment in the timeout value. For instance, this means that we would allow TCP users to specify a flat timeout value of 60s, by specifying "timeo=600,retrans=0" in their mount option string. Siged-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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- 15 Aug, 2016 4 commits
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Trond Myklebust authored
Putting the periodicity timer in the mirror instances is causing non-scalable reporting behaviour and missed reporting intervals. When you recall layouts and/or implement client side mirroring, it leads to consecutive reports with only a few ms between RPC calls. Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Fixes: d0379a5d ("pNFS/flexfiles: Support server-supplied...")
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linuxLinus Torvalds authored
Pull thermal updates from Zhang Rui: - Fix a race condition when updating cooling device, which may lead to a situation where a thermal governor never updates the cooling device. From Michele Di Giorgio. - Fix a zero division error when disabling the forced idle injection from the intel powerclamp. From Petr Mladek. - Add suspend/resume callback for intel_pch_thermal thermal driver. From Srinivas Pandruvada. - Another two fixes for clocking cooling driver and hwmon sysfs I/F. From Michele Di Giorgio and Kuninori Morimoto. [ Hmm. That suspend/resume callback for intel_pch_thermal doesn't look like a fix, but I'm letting it slide.. - Linus ] * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: thermal: clock_cooling: Fix missing mutex_init() thermal: hwmon: EXPORT_SYMBOL_GPL for thermal hwmon sysfs thermal: fix race condition when updating cooling device thermal/powerclamp: Prevent division by zero when counting interval thermal: intel_pch_thermal: Add suspend/resume callback
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git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommuLinus Torvalds authored
Pull m68knommu fix from Greg Ungerer: "This contains only a single fix for a register corruption problem on certain types of m68k flat format binaries" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu: m68knommu: fix user a5 register being overwritten
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- 14 Aug, 2016 2 commits
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Linus Torvalds authored
Merge tag 'fixes-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging Pull h8300 and unicore32 architecture fixes from Guenter Roeck: "Two patches to fix h8300 and unicore32 builds. unicore32 builds have been broken since v4.6. The fix has been available in -next since March of this year. h8300 builds have been broken since the last commit window. The fix has been available in -next since June of this year" * tag 'fixes-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: h8300: Add missing include file to asm/io.h unicore32: mm: Add missing parameter to arch_vma_access_permitted
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxLinus Torvalds authored
Pull arm64 fixes from Catalin Marinas: - support for nr_cpus= command line argument (maxcpus was previously changed to allow secondary CPUs to be hot-plugged) - ARM PMU interrupt handling fix - fix potential TLB conflict in the hibernate code - improved handling of EL1 instruction aborts (better error reporting) - removal of useless jprobes code for stack saving/restoring - defconfig updates * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: arm64: defconfig: enable CONFIG_LOCALVERSION_AUTO arm64: defconfig: add options for virtualization and containers arm64: hibernate: handle allocation failures arm64: hibernate: avoid potential TLB conflict arm64: Handle el1 synchronous instruction aborts cleanly arm64: Remove stack duplicating code from jprobes drivers/perf: arm-pmu: Fix handling of SPI lacking "interrupt-affinity" property drivers/perf: arm-pmu: convert arm_pmu_mutex to spinlock arm64: Support hard limit of cpu count by nr_cpus
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- 13 Aug, 2016 4 commits
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git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds authored
Pull KVM fixes from Radim Krčmář: "KVM: - lock kvm_device list to prevent corruption on device creation. PPC: - split debugfs initialization from creation of the xics device to unlock the newly taken kvm lock earlier. s390: - prevent userspace from triggering two WARN_ON_ONCE. MIPS: - fix several issues in the management of TLB faults (Cc: stable)" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: MIPS: KVM: Propagate kseg0/mapped tlb fault errors MIPS: KVM: Fix gfn range check in kseg0 tlb faults MIPS: KVM: Add missing gfn range check MIPS: KVM: Fix mapped fault broken commpage handling KVM: Protect device ops->create and list_add with kvm->lock KVM: PPC: Move xics_debugfs_init out of create KVM: s390: reset KVM_REQ_MMU_RELOAD if mapping the prefix failed KVM: s390: set the prefix initially properly
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git://git.kernel.dk/linux-blockLinus Torvalds authored
Pull block fixes from Jens Axboe: - an NVMe fix from Gabriel, fixing a suspend/resume issue on some setups - addition of a few missing entries in the block queue sysfs documentation, from Joe - a fix for a sparse shadow warning for the bvec iterator, from Johannes - a writeback deadlock involving raid issuing barriers, and not flushing the plug when we wakeup the flusher threads. From Konstantin - a set of patches for the NVMe target/loop/rdma code, from Roland and Sagi * 'for-linus' of git://git.kernel.dk/linux-block: bvec: avoid variable shadowing warning doc: update block/queue-sysfs.txt entries nvme: Suspend all queues before deletion mm, writeback: flush plugged IO in wakeup_flusher_threads() nvme-rdma: Remove unused includes nvme-rdma: start async event handler after reconnecting to a controller nvmet: Fix controller serial number inconsistency nvmet-rdma: Don't use the inline buffer in order to avoid allocation for small reads nvmet-rdma: Correctly handle RDMA device hot removal nvme-rdma: Make sure to shutdown the controller if we can nvme-loop: Remove duplicate call to nvme_remove_namespaces nvme-rdma: Free the I/O tags when we delete the controller nvme-rdma: Remove duplicate call to nvme_remove_namespaces nvme-rdma: Fix device removal handling nvme-rdma: Queue ns scanning after a sucessful reconnection nvme-rdma: Don't leak uninitialized memory in connect request private data
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Guenter Roeck authored
h8300 builds fail with arch/h8300/include/asm/io.h:9:15: error: unknown type name ‘u8’ arch/h8300/include/asm/io.h:15:15: error: unknown type name ‘u16’ arch/h8300/include/asm/io.h:21:15: error: unknown type name ‘u32’ and many related errors. Fixes: 23c82d41bdf4 ("kexec-allow-architectures-to-override-boot-mapping-fix") Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Guenter Roeck authored
unicore32 fails to compile with the following errors. mm/memory.c: In function ‘__handle_mm_fault’: mm/memory.c:3381: error: too many arguments to function ‘arch_vma_access_permitted’ mm/gup.c: In function ‘check_vma_flags’: mm/gup.c:456: error: too many arguments to function ‘arch_vma_access_permitted’ mm/gup.c: In function ‘vma_permits_fault’: mm/gup.c:640: error: too many arguments to function ‘arch_vma_access_permitted’ Fixes: d61172b4 ("mm/core, x86/mm/pkeys: Differentiate instruction fetches") Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
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- 12 Aug, 2016 7 commits
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git://github.com/awilliam/linux-vfioLinus Torvalds authored
Pull VFIO fix from Alex Williamson: "Fix oops when dereferencing empty data (Alex Williamson)" * tag 'vfio-v4.8-rc2' of git://github.com/awilliam/linux-vfio: vfio/pci: Fix NULL pointer oops in error interrupt setup handling
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git://linux-nfs.org/~bfields/linuxLinus Torvalds authored
Pull nfsd fixes from Bruce Fields: "Fixes for the dentry refcounting leak I introduced in 4.8-rc1, and for races in the LOCK code which appear to go back to the big nfsd state lock removal from 3.17" * tag 'nfsd-4.8-1' of git://linux-nfs.org/~bfields/linux: nfsd: don't return an unhashed lock stateid after taking mutex nfsd: Fix race between FREE_STATEID and LOCK nfsd: fix dentry refcounting on create
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pmLinus Torvalds authored
Pull power management fixes from Rafael Wysocki: "Two hibernation fixes allowing it to work with the recently added randomization of the kernel identity mapping base on x86-64 and one cpufreq driver regression fix. Specifics: - Fix the x86 identity mapping creation helpers to avoid the assumption that the base address of the mapping will always be aligned at the PGD level, as it may be aligned at the PUD level if address space randomization is enabled (Rafael Wysocki). - Fix the hibernation core to avoid executing tracing functions before restoring the processor state completely during resume (Thomas Garnier). - Fix a recently introduced regression in the powernv cpufreq driver that causes it to crash due to an out-of-bounds array access (Akshay Adiga)" * tag 'pm-4.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: PM / hibernate: Restore processor state before using per-CPU variables x86/power/64: Always create temporary identity mapping correctly cpufreq: powernv: Fix crash in gpstate_timer_handler()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 fixes from Ingo Molnar: "This is bigger than usual - the reason is partly a pent-up stream of fixes after the merge window and partly accidental. The fixes are: - five patches to fix a boot failure on Andy Lutomirsky's laptop - four SGI UV platform fixes - KASAN fix - warning fix - documentation update - swap entry definition fix - pkeys fix - irq stats fix" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/apic/x2apic, smp/hotplug: Don't use before alloc in x2apic_cluster_probe() x86/efi: Allocate a trampoline if needed in efi_free_boot_services() x86/boot: Rework reserve_real_mode() to allow multiple tries x86/boot: Defer setup_real_mode() to early_initcall time x86/boot: Synchronize trampoline_cr4_features and mmu_cr4_features directly x86/boot: Run reserve_bios_regions() after we initialize the memory map x86/irq: Do not substract irq_tlb_count from irq_call_count x86/mm: Fix swap entry comment and macro x86/mm/kaslr: Fix -Wformat-security warning x86/mm/pkeys: Fix compact mode by removing protection keys' XSAVE buffer manipulation x86/build: Reduce the W=1 warnings noise when compiling x86 syscall tables x86/platform/UV: Fix kernel panic running RHEL kdump kernel on UV systems x86/platform/UV: Fix problem with UV4 BIOS providing incorrect PXM values x86/platform/UV: Fix bug with iounmap() of the UV4 EFI System Table causing a crash x86/platform/UV: Fix problem with UV4 Socket IDs not being contiguous x86/entry: Clarify the RF saving/restoring situation with SYSCALL/SYSRET x86/mm: Disable preemption during CR3 read+write x86/mm/KASLR: Increase BRK pages for KASLR memory randomization x86/mm/KASLR: Fix physical memory calculation on KASLR memory randomization x86, kasan, ftrace: Put APIC interrupt handlers into .irqentry.text
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull timer fixes from Ingo Molnar: "Misc fixes: a /dev/rtc regression fix, two APIC timer period calibration fixes, an ARM clocksource driver fix and a NOHZ power use regression fix" * 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/hpet: Fix /dev/rtc breakage caused by RTC cleanup x86/timers/apic: Inform TSC deadline clockevent device about recalibration x86/timers/apic: Fix imprecise timer interrupts by eliminating TSC clockevents frequency roundoff error timers: Fix get_next_timer_interrupt() computation clocksource/arm_arch_timer: Force per-CPU interrupt to be level-triggered
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Rafael J. Wysocki authored
* pm-sleep: PM / hibernate: Restore processor state before using per-CPU variables x86/power/64: Always create temporary identity mapping correctly * pm-cpufreq: cpufreq: powernv: Fix crash in gpstate_timer_handler()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull scheduler fixes from Ingo Molnar: "Misc fixes: cputime fixes, two deadline scheduler fixes and a cgroups scheduling fix" * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: sched/cputime: Fix omitted ticks passed in parameter sched/cputime: Fix steal time accounting sched/deadline: Fix lock pinning warning during CPU hotplug sched/cputime: Mitigate performance regression in times()/clock_gettime() sched/fair: Fix typo in sync_throttle() sched/deadline: Fix wrap-around in DL heap
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