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Re: [PATCH v3 10/25] openrisc: add spinlock implementation

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On Wed, Feb 22, 2017 at 04:11:39AM +0900, Stafford Horne wrote:
> +static inline void arch_spin_unlock(arch_spinlock_t *lock)
> +{
> +	smp_mb();
> +	lock->tickets.owner++;
> +}

This is putting a lot of trust in the compiler, nothing is volatile so
it can do horrible things.

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[PATCH v3 00/25] OpenRISC patches for 4.11 final call Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 16/25] openrisc: Add optimized memcpy routine Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 13/25] openrisc: Fix the bitmask for the unit present register Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 05/25] openrisc: head: refactor out tlb flush into it's own function Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 23/25] arch/openrisc/lib/memcpy.c: use correct OR1200 option Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 19/25] scripts/checkstack.pl: Add openrisc support Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 24/25] openrisc: Export ioremap symbols used by modules Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 21/25] openrisc: entry: Fix delay slot detection Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 04/25] openrisc: head: use THREAD_SIZE instead of magic constant Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 02/25] openrisc: add cache way information to cpuinfo Stafford Horne <shorne@gmail.com> - 2017-02-21 20:20 +0100
  [PATCH v3 14/25] openrisc: Initial support for the idle state Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100
    Re: [PATCH v3 14/25] openrisc: Initial support for the idle state Joe Perches <joe@perches.com> - 2017-02-21 21:30 +0100
      Re: [PATCH v3 14/25] openrisc: Initial support for the idle state Stafford Horne <shorne@gmail.com> - 2017-02-22 15:20 +0100
  [PATCH v3 18/25] MAINTAINERS: Add the openrisc official repository Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100
  [PATCH v3 07/25] openrisc: add atomic bitops Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100
  [PATCH v3 09/25] openrisc: add optimized atomic operations Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100
    Re: [PATCH v3 09/25] openrisc: add optimized atomic operations Peter Zijlstra <peterz@infradead.org> - 2017-02-22 12:30 +0100
      Re: [PATCH v3 09/25] openrisc: add optimized atomic operations Stafford Horne <shorne@gmail.com> - 2017-02-22 15:30 +0100
        Re: [OpenRISC] [PATCH v3 09/25] openrisc: add optimized atomic  operations Richard Henderson <rth@twiddle.net> - 2017-02-22 18:40 +0100
          Re: [OpenRISC] [PATCH v3 09/25] openrisc: add optimized atomic  operations Stafford Horne <shorne@gmail.com> - 2017-02-22 23:50 +0100
  [PATCH v3 11/25] openrisc: add futex_atomic_* implementations Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100
  [PATCH v3 17/25] openrisc: Add .gitignore Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100
  [PATCH v3 08/25] openrisc: add cmpxchg and xchg implementations Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100
    Re: [PATCH v3 08/25] openrisc: add cmpxchg and xchg implementations Peter Zijlstra <peterz@infradead.org> - 2017-02-22 12:30 +0100
      Re: [PATCH v3 08/25] openrisc: add cmpxchg and xchg implementations Stafford Horne <shorne@gmail.com> - 2017-02-22 15:30 +0100
        Re: [OpenRISC] [PATCH v3 08/25] openrisc: add cmpxchg and xchg  implementations Richard Henderson <rth@twiddle.net> - 2017-02-22 18:40 +0100
          Re: [OpenRISC] [PATCH v3 08/25] openrisc: add cmpxchg and xchg  implementations Stafford Horne <shorne@gmail.com> - 2017-02-22 23:50 +0100
  [PATCH v3 10/25] openrisc: add spinlock implementation Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100
    Re: [PATCH v3 10/25] openrisc: add spinlock implementation Peter Zijlstra <peterz@infradead.org> - 2017-02-22 12:30 +0100
    Re: [PATCH v3 10/25] openrisc: add spinlock implementation Peter Zijlstra <peterz@infradead.org> - 2017-02-22 12:40 +0100
    Re: [PATCH v3 10/25] openrisc: add spinlock implementation Peter Zijlstra <peterz@infradead.org> - 2017-02-22 12:40 +0100
      Re: [PATCH v3 10/25] openrisc: add spinlock implementation Peter Zijlstra <peterz@infradead.org> - 2017-02-22 13:10 +0100
    Re: [PATCH v3 10/25] openrisc: add spinlock implementation Peter Zijlstra <peterz@infradead.org> - 2017-02-22 12:40 +0100
    Re: [PATCH v3 10/25] openrisc: add spinlock implementation Peter Zijlstra <peterz@infradead.org> - 2017-02-22 12:50 +0100
      Re: [PATCH v3 10/25] openrisc: add spinlock implementation Peter Zijlstra <peterz@infradead.org> - 2017-02-22 13:10 +0100
  [PATCH v3 20/25] openrisc: entry: Whitespace and comment cleanups Stafford Horne <shorne@gmail.com> - 2017-02-21 20:30 +0100

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