On Tuesday 06 January 2009 01:59:28 Christoph Lameter wrote: > On Mon, 5 Jan 2009, Rusty Russell wrote: > > > 3) We do still need RELOC_HIDE: it's for the compiler, not us. It > > can otherwise make assumptions about pointers remaining within objects. > > Never heard about that one. If the compiler would make the assumption that > pointers stay within a struct then the processor could hold data from > another per cpu section in registers while writing to the per cpu variable > of that per cpu section right? > > But doesnt GCC invalidate all object pointers to a certain type of struct > if one field is modified? It was a Richard Henderson thing. It was over six years ago, but I found one decent reference to it: http://lwn.net/2002/0214/a/per-cpu.php3 Hope that answers your question? Rusty. -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
