On Tue, 10 Apr 2007, Robert P. J. Day wrote:
> not strictly speaking a kernel question, but i noticed that most
> architectures define a macro to generate the current text address
> using a local label:
>
> #define current_text_addr() ({ __label__ _l; _l: &&_l;})
>
> now, maybe i'm confused by the syntax, but that looks like what's
> being returned by the statement expression is the "address of the
> address of _l". is that right? why would you need to use *two*
> address-of operators, rather than just one? just curious how this
> actually works. thanks.
never mind. i just read that "&&" is, in fact, the unary "take
address of label" operator.
rday
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Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA
http://fsdev.net/wiki/index.php?title=Main_Page
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