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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-22 17:46:08 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-22 17:46:08 +0100 |
commit | 6ab9e09238fdfd742fe23b81e2d385a1cab49d9b (patch) | |
tree | 38c27b6d70c68f1114df2f49f72f1f757b22cd07 /lib | |
parent | 528985117126f11beea339cf39120ee99da04cd2 (diff) | |
parent | 52990a5fb0c991ecafebdab43138b5ed41376852 (diff) | |
download | linux-stable-6ab9e09238fdfd742fe23b81e2d385a1cab49d9b.tar.gz linux-stable-6ab9e09238fdfd742fe23b81e2d385a1cab49d9b.tar.bz2 linux-stable-6ab9e09238fdfd742fe23b81e2d385a1cab49d9b.zip |
Merge tag 'for-4.20/block-20181021' of git://git.kernel.dk/linux-block
Pull block layer updates from Jens Axboe:
"This is the main pull request for block changes for 4.20. This
contains:
- Series enabling runtime PM for blk-mq (Bart).
- Two pull requests from Christoph for NVMe, with items such as;
- Better AEN tracking
- Multipath improvements
- RDMA fixes
- Rework of FC for target removal
- Fixes for issues identified by static checkers
- Fabric cleanups, as prep for TCP transport
- Various cleanups and bug fixes
- Block merging cleanups (Christoph)
- Conversion of drivers to generic DMA mapping API (Christoph)
- Series fixing ref count issues with blkcg (Dennis)
- Series improving BFQ heuristics (Paolo, et al)
- Series improving heuristics for the Kyber IO scheduler (Omar)
- Removal of dangerous bio_rewind_iter() API (Ming)
- Apply single queue IPI redirection logic to blk-mq (Ming)
- Set of fixes and improvements for bcache (Coly et al)
- Series closing a hotplug race with sysfs group attributes (Hannes)
- Set of patches for lightnvm:
- pblk trace support (Hans)
- SPDX license header update (Javier)
- Tons of refactoring patches to cleanly abstract the 1.2 and 2.0
specs behind a common core interface. (Javier, Matias)
- Enable pblk to use a common interface to retrieve chunk metadata
(Matias)
- Bug fixes (Various)
- Set of fixes and updates to the blk IO latency target (Josef)
- blk-mq queue number updates fixes (Jianchao)
- Convert a bunch of drivers from the old legacy IO interface to
blk-mq. This will conclude with the removal of the legacy IO
interface itself in 4.21, with the rest of the drivers (me, Omar)
- Removal of the DAC960 driver. The SCSI tree will introduce two
replacement drivers for this (Hannes)"
* tag 'for-4.20/block-20181021' of git://git.kernel.dk/linux-block: (204 commits)
block: setup bounce bio_sets properly
blkcg: reassociate bios when make_request() is called recursively
blkcg: fix edge case for blk_get_rl() under memory pressure
nvme-fabrics: move controller options matching to fabrics
nvme-rdma: always have a valid trsvcid
mtip32xx: fully switch to the generic DMA API
rsxx: switch to the generic DMA API
umem: switch to the generic DMA API
sx8: switch to the generic DMA API
sx8: remove dead IF_64BIT_DMA_IS_POSSIBLE code
skd: switch to the generic DMA API
ubd: remove use of blk_rq_map_sg
nvme-pci: remove duplicate check
drivers/block: Remove DAC960 driver
nvme-pci: fix hot removal during error handling
nvmet-fcloop: suppress a compiler warning
nvme-core: make implicit seed truncation explicit
nvmet-fc: fix kernel-doc headers
nvme-fc: rework the request initialization code
nvme-fc: introduce struct nvme_fcp_op_w_sgl
...
Diffstat (limited to 'lib')
-rw-r--r-- | lib/percpu-refcount.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c index 9f96fa7bc000..de10b8c0bff6 100644 --- a/lib/percpu-refcount.c +++ b/lib/percpu-refcount.c @@ -356,11 +356,35 @@ EXPORT_SYMBOL_GPL(percpu_ref_kill_and_confirm); */ void percpu_ref_reinit(struct percpu_ref *ref) { + WARN_ON_ONCE(!percpu_ref_is_zero(ref)); + + percpu_ref_resurrect(ref); +} +EXPORT_SYMBOL_GPL(percpu_ref_reinit); + +/** + * percpu_ref_resurrect - modify a percpu refcount from dead to live + * @ref: perpcu_ref to resurrect + * + * Modify @ref so that it's in the same state as before percpu_ref_kill() was + * called. @ref must be dead but must not yet have exited. + * + * If @ref->release() frees @ref then the caller is responsible for + * guaranteeing that @ref->release() does not get called while this + * function is in progress. + * + * Note that percpu_ref_tryget[_live]() are safe to perform on @ref while + * this function is in progress. + */ +void percpu_ref_resurrect(struct percpu_ref *ref) +{ + unsigned long __percpu *percpu_count; unsigned long flags; spin_lock_irqsave(&percpu_ref_switch_lock, flags); - WARN_ON_ONCE(!percpu_ref_is_zero(ref)); + WARN_ON_ONCE(!(ref->percpu_count_ptr & __PERCPU_REF_DEAD)); + WARN_ON_ONCE(__ref_is_percpu(ref, &percpu_count)); ref->percpu_count_ptr &= ~__PERCPU_REF_DEAD; percpu_ref_get(ref); @@ -368,4 +392,4 @@ void percpu_ref_reinit(struct percpu_ref *ref) spin_unlock_irqrestore(&percpu_ref_switch_lock, flags); } -EXPORT_SYMBOL_GPL(percpu_ref_reinit); +EXPORT_SYMBOL_GPL(percpu_ref_resurrect); |