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of local_lock_t - this primitive comes from the -rt project and identifies
CPU-local locking dependencies normally handled opaquely beind preempt_disable()
or local_irq_save/disable() critical sections.
The generated code on mainline kernels doesn't change as a result, but still there
are benefits: improved debugging and better documentation of data structure
accesses.
The new local_lock_t primitives are introduced and then utilized in a couple of
kernel subsystems. No change in functionality is intended.
There's also other smaller changes and cleanups.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-core-2020-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar:
"The biggest change to core locking facilities in this cycle is the
introduction of local_lock_t - this primitive comes from the -rt
project and identifies CPU-local locking dependencies normally handled
opaquely beind preempt_disable() or local_irq_save/disable() critical
sections.
The generated code on mainline kernels doesn't change as a result, but
still there are benefits: improved debugging and better documentation
of data structure accesses.
The new local_lock_t primitives are introduced and then utilized in a
couple of kernel subsystems. No change in functionality is intended.
There's also other smaller changes and cleanups"
* tag 'locking-core-2020-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
zram: Use local lock to protect per-CPU data
zram: Allocate struct zcomp_strm as per-CPU memory
connector/cn_proc: Protect send_msg() with a local lock
squashfs: Make use of local lock in multi_cpu decompressor
mm/swap: Use local_lock for protection
radix-tree: Use local_lock for protection
locking: Introduce local_lock()
locking/lockdep: Replace zero-length array with flexible-array
locking/rtmutex: Remove unused rt_mutex_cmpxchg_relaxed()
60056060be