hi ,
I couldn't even get the statement
"it says such macros are used to have a
block of statements without errors on subsitution."
I think Jim must be right.It could just be a hook which could be
redefined later.Now another guess could be to check out whether
"do{}while(0)" is another macro defined .....
Becoz for the process list traversal there is a macro like
for_each_process(p) .So there is a chance for "do{}while(0) " to be a
defined macro.Just guessing..
WIth warm Regards,
Pankaj
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