Re: [patch 2/5] mutex subsystem: add architecture specific mutex primitives

• To: Nicolas Pitre <[email protected]>
• Subject: Re: [patch 2/5] mutex subsystem: add architecture specific mutex primitives
• From: Nick Piggin <[email protected]>
• Date: Thu, 22 Dec 2005 18:44:56 +1100
• Cc: Ingo Molnar <[email protected]>, Linus Torvalds <[email protected]>, lkml <[email protected]>, Andrew Morton <[email protected]>, Arjan van de Ven <[email protected]>, Jes Sorensen <[email protected]>, Zwane Mwaikambo <[email protected]>, Oleg Nesterov <[email protected]>, David Howells <[email protected]>, Alan Cox <[email protected]>, Benjamin LaHaise <[email protected]>, Steven Rostedt <[email protected]>, Christoph Hellwig <[email protected]>, Andi Kleen <[email protected]>, Russell King <[email protected]>
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Can you now simply remove the meddling with the atomic.h headers?

i386 can directly implement arch_mutex_fast_lock instead of
atomic_dec_call_if_negative.

Not sure what the policy is with naming, but I prefer mutex_arch_xxx
or __mutex_xxx for the arch specific names.

I think ARMv6 has a decent atomic_cmpxchg implementation but does
not define __HAVE_ARCH_CMPXCHG. It might be useful to try to use this
for ARMv6 SMP for a slightly better trylock.

--
SUSE Labs, Novell Inc.

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• References:
  • [patch 0/8] mutex subsystem, ANNOUNCE
    • From: Ingo Molnar <[email protected]>
  • [patch 3/3] mutex subsystem: move the core to the new atomic helpers
    • From: Nicolas Pitre <[email protected]>
  • Re: [patch 3/3] mutex subsystem: move the core to the new atomic helpers
    • From: Ingo Molnar <[email protected]>
  • [patch 2/5] mutex subsystem: add architecture specific mutex primitives
    • From: Nicolas Pitre <[email protected]>

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