Re: [patch] spinlocks: remove 'volatile'

linux-os (Dick Johnson) wrote:

 	http://en.wikipedia.org/wiki/Memory_barrier

This is used to prevent out-of-order execution, not at all what is
necessary.

I don't think memory barriers prevent out of order execution,
just out of order loads and stores (which could happen on CPUs
that do in-order execution).

--
SUSE Labs, Novell Inc.

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• References:
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Ingo Molnar <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Andrew Morton <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Ingo Molnar <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Andrew Morton <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Linus Torvalds <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Ingo Molnar <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Linus Torvalds <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Ingo Molnar <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Linus Torvalds <[email protected]>
  • Re: [patch] uninline init_waitqueue_*() functions
    • From: Linus Torvalds <[email protected]>
  • [patch] spinlocks: remove 'volatile'
    • From: Ingo Molnar <[email protected]>
  • Re: [patch] spinlocks: remove 'volatile'
    • From: "linux-os \(Dick Johnson\)" <[email protected]>
  • Re: [patch] spinlocks: remove 'volatile'
    • From: Arjan van de Ven <[email protected]>
  • Re: [patch] spinlocks: remove 'volatile'
    • From: "linux-os \(Dick Johnson\)" <[email protected]>

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