Re: page_launder() bug

[Helge Hafting]

Tobias Ringstrom wrote:
> 
> On Sun, 6 May 2001, David S. Miller wrote:
> > It is the most straightforward way to make a '1' or '0'
> > integer from the NULL state of a pointer.
> 
> But is it really specified in the C "standards" to be exctly zero or one,
> and not zero and non-zero?

!0 is 1.  !(anything else) is 0.  It is zero and one, not
zero and "non-zero".  So a !! construction gives zero if you have
zero, and one if you had anything else.  There's no doubt about it.
> 
> IMHO, the ?: construct is way more readable and reliable.

Thats your opinion.  There are many others.  Some don't like the
?: at all, for example.  And some like all valid C.

Helge Hafting