Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures

The only thing volatile on an asm does is create a side effect
on the asm statement; in effect, it tells the compiler "do not
remove this asm even if you don't need any of its outputs".

It's not disabling optimisation likely to result in bugs,
heisen- or otherwise; _not_ putting the volatile on an asm
that needs it simply _is_ a bug :-)

Yep.  And the reason it is a bug is that it fails to disable
the relevant compiler optimizations.  So I suspect that we might
actually be saying the same thing here.

We're not saying the same thing, but we do agree :-)


Segher

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• References:
  • Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures
    • From: Herbert Xu <[email protected]>
  • Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures
    • From: Chris Snook <[email protected]>
  • Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures
    • From: Herbert Xu <[email protected]>
  • Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures
    • From: "Paul E. McKenney" <[email protected]>
  • Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures
    • From: Segher Boessenkool <[email protected]>
  • Re: [PATCH 0/24] make atomic_read() behave consistently across all architectures
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