- 23 7月, 2015 7 次提交
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由 Alexei Starovoitov 提交于
Although rcu_is_watching() is marked notrace, it invokes preempt_disable() and preempt_enable(), both of which can be traced. This defeats the purpose of the notrace on rcu_is_watching(), so this commit substitutes preempt_disable_notrace() and preempt_enable_notrace(). Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: NSteven Rostedt <rostedt@goodmis.org>
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由 Paul E. McKenney 提交于
In kernels built with CONFIG_PREEMPT, _cpu_down() waits for RCU and RCU-sched grace periods back-to-back, incurring quite a bit more latency than required. This commit therefore uses the new synchronize_rcu_mult() to allow waiting for both grace periods concurrently. Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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由 Paul E. McKenney 提交于
There have been several requests for a primitive that waits for grace periods for several RCU flavors concurrently, so this commit creates it. This is a variadic macro, and you pass in the call_rcu() functions of the flavors of RCU that you wish to wait for. Note that you cannot pass in call_srcu() for two reasons: (1) This would result in a type mismatch and (2) You need to specify which srcu_struct you want to use. Handle this by creating a wrapper function for your SRCU domain, for example: void call_srcu_mine(struct rcu_head *head, rcu_callback_t func) { call_srcu(&ss_mine, head, func); } You can then do something like this: synchronize_rcu_mult(call_srcu_mine, call_rcu, call_rcu_sched); Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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由 Paul E. McKenney 提交于
Tasks are no longer migrated to the root rcu_node, so there is no longer any need for a boost kthread for the root rcu_node, and there no longer is such a kthread. This commit therefore fixes the comment in rcu_boost_kthread()'s header to reflect this new reality. Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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由 Peter Zijlstra 提交于
For the paranoid amongst us GCC would be in its right to use byte stores to write our NULL value, tell it not to do that. Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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由 Paul E. McKenney 提交于
This commit prevents Kconfig from asking the user about RCU_NOCB_CPU unless the user really wants to be asked. Reported-by: NIngo Molnar <mingo@kernel.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: Thomas Gleixner <tglx@linutronix.de>
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由 Paul E. McKenney 提交于
The get_state_synchronize_rcu() and cond_synchronize_rcu() functions allow polling for grace-period completion, with an actual wait for a grace period occurring only when cond_synchronize_rcu() is called too soon after the corresponding get_state_synchronize_rcu(). However, these functions work only for vanilla RCU. This commit adds the get_state_synchronize_sched() and cond_synchronize_sched(), which provide the same capability for RCU-sched. Reported-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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- 16 7月, 2015 2 次提交
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由 Nicholas Mc Guire 提交于
Type-checking coccinelle spatches are being used to locate type mismatches between function signatures and return values in this case this produced: ./kernel/rcu/srcu.c:271 WARNING: return of wrong type int != unsigned long, srcu_readers_active() returns an int that is the sum of per_cpu unsigned long but the only user is cleanup_srcu_struct() which is using it as a boolean (condition) to see if there is any readers rather than actually using the approximate number of readers. The theoretically possible unsigned long overflow case does not need to be handled explicitly - if we had 4G++ readers then something else went wrong a long time ago. proposal: change the return type to boolean. The function name is left unchanged as it fits the naming expectation for a boolean. patch was compile tested for x86_64_defconfig (implies CONFIG_SRCU=y) patch is against 4.1-rc5 (localversion-next is -next-20150525) Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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由 Denys Vlasenko 提交于
DEBUG_LOCK_ALLOC=y is not a production setting, but it is not very unusual either. Many developers routinely use kernels built with it enabled. Apart from being selected by hand, it is also auto-selected by PROVE_LOCKING "Lock debugging: prove locking correctness" and LOCK_STAT "Lock usage statistics" config options. LOCK STAT is necessary for "perf lock" to work. I wouldn't spend too much time optimizing it, but this particular function has a very large cost in code size: when it is deinlined, code size decreases by 830,000 bytes: text data bss dec hex filename 85674192 22294776 20627456 128596424 7aa39c8 vmlinux.before 84837612 22294424 20627456 127759492 79d7484 vmlinux (with this config: http://busybox.net/~vda/kernel_config) Signed-off-by: NDenys Vlasenko <dvlasenk@redhat.com> CC: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> CC: Josh Triplett <josh@joshtriplett.org> CC: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> CC: Lai Jiangshan <laijs@cn.fujitsu.com> CC: Tejun Heo <tj@kernel.org> CC: Oleg Nesterov <oleg@redhat.com> CC: linux-kernel@vger.kernel.org Reviewed-by: NSteven Rostedt <rostedt@goodmis.org> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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- 07 7月, 2015 1 次提交
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由 Paul E. McKenney 提交于
The RCU_USER_QS Kconfig parameter is now just a synonym for NO_HZ_FULL, so this commit eliminates RCU_USER_QS, replacing all uses with NO_HZ_FULL. Reported-by: NFrederic Weisbecker <fweisbec@gmail.com> Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com>
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- 06 7月, 2015 2 次提交
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由 Linus Torvalds 提交于
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由 Linus Torvalds 提交于
Merge tag 'platform-drivers-x86-v4.2-2' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86 Pull late x86 platform driver updates from Darren Hart: "The following came in a bit later and I wanted them to bake in next a few more days before submitting, thus the second pull. A new intel_pmc_ipc driver, a symmetrical allocation and free fix in dell-laptop, a couple minor fixes, and some updated documentation in the dell-laptop comments. intel_pmc_ipc: - Add Intel Apollo Lake PMC IPC driver tc1100-wmi: - Delete an unnecessary check before the function call "kfree" dell-laptop: - Fix allocating & freeing SMI buffer page - Show info about WiGig and UWB in debugfs - Update information about wireless control" * tag 'platform-drivers-x86-v4.2-2' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86: intel_pmc_ipc: Add Intel Apollo Lake PMC IPC driver tc1100-wmi: Delete an unnecessary check before the function call "kfree" dell-laptop: Fix allocating & freeing SMI buffer page dell-laptop: Show info about WiGig and UWB in debugfs dell-laptop: Update information about wireless control
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- 05 7月, 2015 28 次提交
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs由 Linus Torvalds 提交于
Pull more vfs updates from Al Viro: "Assorted VFS fixes and related cleanups (IMO the most interesting in that part are f_path-related things and Eric's descriptor-related stuff). UFS regression fixes (it got broken last cycle). 9P fixes. fs-cache series, DAX patches, Jan's file_remove_suid() work" [ I'd say this is much more than "fixes and related cleanups". The file_table locking rule change by Eric Dumazet is a rather big and fundamental update even if the patch isn't huge. - Linus ] * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (49 commits) 9p: cope with bogus responses from server in p9_client_{read,write} p9_client_write(): avoid double p9_free_req() 9p: forgetting to cancel request on interrupted zero-copy RPC dax: bdev_direct_access() may sleep block: Add support for DAX reads/writes to block devices dax: Use copy_from_iter_nocache dax: Add block size note to documentation fs/file.c: __fget() and dup2() atomicity rules fs/file.c: don't acquire files->file_lock in fd_install() fs:super:get_anon_bdev: fix race condition could cause dev exceed its upper limitation vfs: avoid creation of inode number 0 in get_next_ino namei: make set_root_rcu() return void make simple_positive() public ufs: use dir_pages instead of ufs_dir_pages() pagemap.h: move dir_pages() over there remove the pointless include of lglock.h fs: cleanup slight list_entry abuse xfs: Correctly lock inode when removing suid and file capabilities fs: Call security_ops->inode_killpriv on truncate fs: Provide function telling whether file_remove_privs() will do anything ...
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由 Linus Torvalds 提交于
Commit 835a6a2f ("Bluetooth: Stop sabotaging list poisoning") thought that the code was sabotaging the list poisoning when NULL'ing out the list pointers and removed it. But what was going on was that the bluetooth code was using NULL pointers for the list as a way to mark it empty, and that commit just broke it (and replaced the test with NULL with a "list_empty()" test on a uninitialized list instead, breaking things even further). So fix it all up to use the regular and real list_empty() handling (which does not use NULL, but a pointer to itself), also making sure to initialize the list properly (the previous NULL case was initialized implicitly by the session being allocated with kzalloc()) This is a combination of patches by Marcel Holtmann and Tedd Ho-Jeong An. [ I would normally expect to get this through the bt tree, but I'm going to release -rc1, so I'm just committing this directly - Linus ] Reported-and-tested-by: NJörg Otte <jrg.otte@gmail.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Original-by: NTedd Ho-Jeong An <tedd.an@intel.com> Original-by: Marcel Holtmann <marcel@holtmann.org>: Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending由 Linus Torvalds 提交于
Pull SCSI target updates from Nicholas Bellinger: "It's been a busy development cycle for target-core in a number of different areas. The fabric API usage for se_node_acl allocation is now within target-core code, dropping the external API callers for all fabric drivers tree-wide. There is a new conversion to RCU hlists for se_node_acl and se_portal_group LUN mappings, that turns fast-past LUN lookup into a completely lockless code-path. It also removes the original hard-coded limitation of 256 LUNs per fabric endpoint. The configfs attributes for backends can now be shared between core and driver code, allowing existing drivers to use common code while still allowing flexibility for new backend provided attributes. The highlights include: - Merge sbc_verify_dif_* into common code (sagi) - Remove iscsi-target support for obsolete IFMarker/OFMarker (Christophe Vu-Brugier) - Add bidi support in target/user backend (ilias + vangelis + agover) - Move se_node_acl allocation into target-core code (hch) - Add crc_t10dif_update common helper (akinobu + mkp) - Handle target-core odd SGL mapping for data transfer memory (akinobu) - Move transport ID handling into target-core (hch) - Move task tag into struct se_cmd + support 64-bit tags (bart) - Convert se_node_acl->device_list[] to RCU hlist (nab + hch + paulmck) - Convert se_portal_group->tpg_lun_list[] to RCU hlist (nab + hch + paulmck) - Simplify target backend driver registration (hch) - Consolidate + simplify target backend attribute implementations (hch + nab) - Subsume se_port + t10_alua_tg_pt_gp_member into se_lun (hch) - Drop lun_sep_lock for se_lun->lun_se_dev RCU usage (hch + nab) - Drop unnecessary core_tpg_register TFO parameter (nab) - Use 64-bit LUNs tree-wide (hannes) - Drop left-over TARGET_MAX_LUNS_PER_TRANSPORT limit (hannes)" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (76 commits) target: Bump core version to v5.0 target: remove target_core_configfs.h target: remove unused TARGET_CORE_CONFIG_ROOT define target: consolidate version defines target: implement WRITE_SAME with UNMAP bit using ->execute_unmap target: simplify UNMAP handling target: replace se_cmd->execute_rw with a protocol_data field target/user: Fix inconsistent kmap_atomic/kunmap_atomic target: Send UA when changing LUN inventory target: Send UA upon LUN RESET tmr completion target: Send UA on ALUA target port group change target: Convert se_lun->lun_deve_lock to normal spinlock target: use 'se_dev_entry' when allocating UAs target: Remove 'ua_nacl' pointer from se_ua structure target_core_alua: Correct UA handling when switching states xen-scsiback: Fix compile warning for 64-bit LUN target: Remove TARGET_MAX_LUNS_PER_TRANSPORT target: use 64-bit LUNs target: Drop duplicate + unused se_dev_check_wce target: Drop unnecessary core_tpg_register TFO parameter ...
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git://github.com/jonmason/ntb由 Linus Torvalds 提交于
Pull NTB updates from Jon Mason: "This includes a pretty significant reworking of the NTB core code, but has already produced some significant performance improvements. An abstraction layer was added to allow the hardware and clients to be easily added. This required rewriting the NTB transport layer for this abstraction layer. This modification will allow future "high performance" NTB clients. In addition to this change, a number of performance modifications were added. These changes include NUMA enablement, using CPU memcpy instead of asyncdma, and modification of NTB layer MTU size" * tag 'ntb-4.2' of git://github.com/jonmason/ntb: (22 commits) NTB: Add split BAR output for debugfs stats NTB: Change WARN_ON_ONCE to pr_warn_once on unsafe NTB: Print driver name and version in module init NTB: Increase transport MTU to 64k from 16k NTB: Rename Intel code names to platform names NTB: Default to CPU memcpy for performance NTB: Improve performance with write combining NTB: Use NUMA memory in Intel driver NTB: Use NUMA memory and DMA chan in transport NTB: Rate limit ntb_qp_link_work NTB: Add tool test client NTB: Add ping pong test client NTB: Add parameters for Intel SNB B2B addresses NTB: Reset transport QP link stats on down NTB: Do not advance transport RX on link down NTB: Differentiate transport link down messages NTB: Check the device ID to set errata flags NTB: Enable link for Intel root port mode in probe NTB: Read peer info from local SPAD in transport NTB: Split ntb_hw_intel and ntb_transport drivers ...
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由 Al Viro 提交于
if server claims to have written/read more than we'd told it to, warn and cap the claimed byte count to avoid advancing more than we are ready to.
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由 Al Viro 提交于
Braino in "9p: switch p9_client_write() to passing it struct iov_iter *"; if response is impossible to parse and we discard the request, get the out of the loop right there. Cc: stable@vger.kernel.org Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
If we'd already sent a request and decide to abort it, we *must* issue TFLUSH properly and not just blindly reuse the tag, or we'll get seriously screwed when response eventually arrives and we confuse it for response to later request that had reused the same tag. Cc: stable@vger.kernel.org # v3.2 and later Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Matthew Wilcox 提交于
The brd driver is the only in-tree driver that may sleep currently. After some discussion on linux-fsdevel, we decided that any driver may choose to sleep in its ->direct_access method. To ensure that all callers of bdev_direct_access() are prepared for this, add a call to might_sleep(). Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Matthew Wilcox 提交于
If a block device supports the ->direct_access methods, bypass the normal DIO path and use DAX to go straight to memcpy() instead of allocating a DIO and a BIO. Includes support for the DIO_SKIP_DIO_COUNT flag in DAX, as is done in do_blockdev_direct_IO(). Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Matthew Wilcox 提交于
When userspace does a write, there's no need for the written data to pollute the CPU cache. This matches the original XIP code. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Matthew Wilcox 提交于
For block devices which are small enough, mkfs will default to creating a filesystem with block sizes smaller than page size. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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git://git.kernel.org/pub/scm/virt/kvm/kvm由 Linus Torvalds 提交于
Pull kvm fixes from Paolo Bonzini: "Except for the preempt notifiers fix, these are all small bugfixes that could have been waited for -rc2. Sending them now since I was taking care of Peter's patch anyway" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: kvm: add hyper-v crash msrs values KVM: x86: remove data variable from kvm_get_msr_common KVM: s390: virtio-ccw: don't overwrite config space values KVM: x86: keep track of LVT0 changes under APICv KVM: x86: properly restore LVT0 KVM: x86: make vapics_in_nmi_mode atomic sched, preempt_notifier: separate notifier registration from static_key inc/dec
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由 Dave Jiang 提交于
When split BAR is enabled, the driver needs to dump out the split BAR registers rather than the original 64bit BAR registers. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Dave Jiang 提交于
The unsafe doorbell and scratchpad access should display reason when WARN is called. Otherwise we get a stack dump without any explanation. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Dave Jiang 提交于
Printouts driver name and version to indicate what is being loaded. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Dave Jiang 提交于
Benchmarking showed a significant performance increase with the MTU size to 64k instead of 16k. Change the driver default to 64k. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Dave Jiang 提交于
Instead of using the platform code names, use the correct platform names to identify the respective Intel NTB hardware. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Dave Jiang 提交于
Disable DMA usage by default, since the CPU provides much better performance with write combining. Provide a module parameter to enable DMA usage when offloading the memcpy is preferred. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Dave Jiang 提交于
Changing the memory window BAR mappings to write combining significantly boosts the performance. We will also use memcpy that uses non-temporal store, which showed performance improvement when doing non-cached memcpys. Signed-off-by: NDave Jiang <dave.jiang@intel.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
Allocate memory for the NUMA node of the NTB device. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
Allocate memory and request the DMA channel for the same NUMA node as the NTB device. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
When the ntb transport is connecting and waiting for the peer, the debug console receives lots of debug level messages about the remote qp link status being down. Rate limit those messages. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
This is a simple debugging driver that enables the doorbell and scratch pad registers to be read and written from the debugfs. This tool enables more complicated debugging to be scripted from user space. This driver may be used to test that your ntb hardware and drivers are functioning at a basic level. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
This is a simple ping pong driver that exercises the scratch pads and doorbells of the ntb hardware. This driver may be used to test that your ntb hardware and drivers are functioning at a basic level. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
Add module parameters for the addresses to be used in B2B topology. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
Reset the link stats when the link goes down. In particular, the TX and RX index and count must be reset, or else the TX side will be sending packets to the RX side where the RX side is not expecting them. Reset all the stats, to be consistent. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
On link down, don't advance RX index to the next entry. The next entry should never be valid after receiving the link down flag. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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由 Allen Hubbe 提交于
The same message "qp %d: Link Down\n" was printed at two locations in ntb_transport. Change the messages so they are distinct. Signed-off-by: NAllen Hubbe <Allen.Hubbe@emc.com> Signed-off-by: NJon Mason <jdmason@kudzu.us>
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