On Thu, 9 Aug 2007, Chris Snook wrote:
> This patchset makes the behavior of atomic_read uniform by removing the
> volatile keyword from all atomic_t and atomic64_t definitions that currently
> have it, and instead explicitly casts the variable as volatile in
> atomic_read(). This leaves little room for creative optimization by the
> compiler, and is in keeping with the principles behind "volatile considered
> harmful".
volatile is generally harmful even in atomic_read(). Barriers control
visibility and AFAICT things are fine.
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