On Sun, Jan 03, 2010 at 11:49:09AM -0500, Anand Arumugam wrote: > I think the last __v; inside the macro is to avoid compiler warning or > error that the unsigned 8-bit variable __v is not being used inside the > scope defined by the macro.
That's incorrect. The GNU C literature states that a compound statement enclosed in parentheses may appear as an expression. As a previous poster pointed out, the expansion of the readb macro is a compound statement which is surrounded by parentheses and is therefore an expression that evaluates to the value of the last subexpression in the compound statement : in this case the value of __v. See <http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html> for more information. Cheers, Robin -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecar...@nl.linux.org Please read the FAQ at http://kernelnewbies.org/FAQ
