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SubjectRe: [cpuops cmpxchg double V2 1/4] Generic support for this_cpu_cmpxchg_double
* Tejun Heo (tj@kernel.org) wrote:
[...]
> > (note: packed here along with "aligned" does _not_ generate ugly
> > bytewise read/write memory ops like "packed" alone. The use of
> > "packed" is to let the compiler down-align the structure to the
> > value requested, instead of uselessly aligning it on 32-byte if it
> > chooses to.)
>
> Yeah, good point. :-)

For the records, I just noticed that "packed, aligned(8)" can generate unaligned
accesses on sparc64 by removing the padding between a "int" and a following
pointer. So we should not use it.

Thanks,

Mathieu

--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com


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