On Oct 2, 2009, at 9:46 AM, Timur Tabi wrote:
Michael Barkowski wrote:
Just wondering - is there a case where using volatile for UCC
parameter RAM for example will not work, or is the use of I/O
accessors everywhere an attempt to be portable to other
architectures?
'volatile' just doesn't really do what you think it should do. The
PowerPC architecture is too complicated w.r.t. ordering of reads and
writes. In other words, you can't trust it.
No one should be using 'volatile' to access I/O registers.
See Documentation/volatile-considered-harmful.txt
- k
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