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asm-generic: New generic ticket-based spinlock

Browse source 
This contains a new ticket-based spinlock that uses only generic
 atomics and doesn't require as much from the memory system as qspinlock
 does in order to be fair.  It also includes a bit of documentation about
 the qspinlock and qrwlock fairness requirements.
 
 This will soon be used by a handful of architectures that don't meet the
 qspinlock requirements.
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Merge tag 'generic-ticket-spinlocks-v6' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux into asm-generic

asm-generic: New generic ticket-based spinlock

This contains a new ticket-based spinlock that uses only generic
atomics and doesn't require as much from the memory system as qspinlock
does in order to be fair.  It also includes a bit of documentation about
the qspinlock and qrwlock fairness requirements.

This will soon be used by a handful of architectures that don't meet the
qspinlock requirements.

* tag 'generic-ticket-spinlocks-v6' of git://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux:
  csky: Move to generic ticket-spinlock
  RISC-V: Move to queued RW locks
  RISC-V: Move to generic spinlocks
  openrisc: Move to ticket-spinlock
  asm-generic: qrwlock: Document the spinlock fairness requirements
  asm-generic: qspinlock: Indicate the use of mixed-size atomics
  asm-generic: ticket-lock: New generic ticket-based spinlock
This commit is contained in:
Arnd Bergmann 2022-05-11 20:52:52 +02:00
commit 03a679a1a4
15 changed files with 147 additions and 321 deletions
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