Re: gcc 4.5 and TLS

[Brad Boyer <flar@allandria.com>]

On Sun, Jun 06, 2010 at 10:48:25AM +0200, Andreas Schwab wrote:
> Geert Uytterhoeven <geert@linux-m68k.org> writes:
> 
> > Don't know if there are other places that make assumptions about
> > __alignof__(u32) == sizeof(u32).
> 
> See get_futex_key_refs.

OK. I see now that the code uses the lowest 2 bits for other purposes.
This isn't easy to see from the code, and the comment that says that
is actually hidden along with the type definition of futex_key
inside the header file.

My apologies for responding to the other email before reading this one.

Is there a document somewhere on how all of this works, or is it
just the comments scattered about all the code? The man page for
the system call isn't really enough to explain the implementation.

	Brad Boyer
	flar@allandria.com