Re: [PATCH 6/24] make atomic_read() behave consistently on frv

Segher Boessenkool wrote:

Please check the definition of "cache coherence".

Which of the twelve thousand such definitions?  :-)

Every definition I have seen says that writes to a single memory
location have a serial order as seen by all CPUs, and that a read
will return the most recent write in the sequence (with a bit of
extra mumbo jumbo to cover store queues and store forwarding).

Within such a definition, I don't see how would be allowed for a
single CPU to execute reads out of order and have the second read
return an earlier write than the first read.

--
SUSE Labs, Novell Inc.
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• References:
  • [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: Chris Snook <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: David Howells <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: David Howells <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: Chris Snook <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: Nick Piggin <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: Segher Boessenkool <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: "Paul E. McKenney" <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: Segher Boessenkool <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: "Paul E. McKenney" <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: Segher Boessenkool <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: "Paul E. McKenney" <[email protected]>
  • Re: [PATCH 6/24] make atomic_read() behave consistently on frv
    • From: Segher Boessenkool <[email protected]>

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