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SubjectRe: [PATCH 0/24] make atomic_read() behave consistently across all architectures
Arnd Bergmann wrote:
> On Thursday 09 August 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".
>>
>
> Just an idea: since all architectures already include asm-generic/atomic.h,
> why not move the definitions of atomic_t and atomic64_t, as well as anything
> that does not involve architecture specific inline assembly into the generic
> header?
>
> Arnd <><

a) chicken and egg: asm-generic/atomic.h depends on definitions in asm/atomic.h

If you can find a way to reshuffle the code and make it simpler, I personally am
all for it. I'm skeptical that you'll get much to show for the effort.

b) The definitions aren't precisely identical between all architectures, so it
would be a mess of special cases, which gets us right back to where we are now.

-- Chris
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