From: "H. Peter Anvin" <[EMAIL PROTECTED]> Date: Mon, 19 Nov 2007 18:00:23 -0800
> Christoph Lameter wrote: > > Support fast cpu ops in x86_64 by providing a series of functions that > > generate the proper instructions. Define CONFIG_FAST_CPU_OPS so that core > > code > > can exploit the availability of fast per cpu operations. > > > > Signed-off-by: Christoph Lameter <[EMAIL PROTECTED]> > > There was, at some point, discussion about using the gcc TLS mechanism, > which should permit even better code to be generated. Unfortunately, it > would require gcc to be able to reference %gs instead of %fs (and vice > versa for i386), which I don't think is available in anything except > maybe the most cutting-edge version of gcc. You can't use __thread because GCC will cache __thread computed addresses across context switches and cpu changes. It's been tried before on powerpc, it doesn't work. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/