On Tuesday 20 November 2007 03:19, H. Peter Anvin wrote: > David Miller wrote: > >> 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. > > OK, that pretty much answers that question.
I investigated that some time ago. There are other obstacles too on x86-64, e.g. the relocations are wrong for kernel mode. You would need to extend the linker first. -Andi - 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/
