Messages in this thread | | | Date | Fri, 21 Jan 2011 14:32:40 -0500 | From | Mathieu Desnoyers <> | Subject | Re: [cpuops cmpxchg double V2 1/4] Generic support for this_cpu_cmpxchg_double |
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* 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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