Re: [PATCH] 2.4.10-ac11 parport_pc.c bugfix

From: bill davidsen (
Date: Thu Oct 11 2001 - 17:41:32 EST

In article <1002808349.10317.7.camel@thanatos> you write:
| I guess the question is: Which way is more portable? Is
| "(unsigned long)-1" liable to turn out as something other than
| ~0U?
| If your way of expressing it is more portable then we should
| make the change ... BOTH in pnp_bios.c and in parport_pc.c .
| Opinions?

Does this address any bug present without the cast? If the expression
left of == is unsigned long, ~0U will work, as will (unsigned)~0. But
more to the point, do you mean "minus one" or "all ones" here? While
Linux does not currently run on any machine which is not 2's complement,
I think if you want all ones you should use (unsigned long)~0 as most

Yes, I have programmed 1's complement machines :-(

bill davidsen <>
 "If I were a diplomat, in the best case I'd go hungry.  In the worst
  case, people would die."
		-- Robert Lipe
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