On Fri, 01 Sep 2006 10:34:24 -0700 Roland Dreier <[EMAIL PROTECTED]> wrote:
> Andrew> What's __raw_writeq() supposed to do, anyway? On alpha > Andrew> it's writeq() without an mb(). On parisc it's writeq() > Andrew> only the data is byte-reversed. On sparc64() it's > Andrew> incomprehensible. On everything else it's writeq(). > > My understanding is that __raw_writeq() is like writeq() except not > strongly ordered and without the byte-swap on big-endian > architectures. The __raw_writeX() variants are convenient to avoid > having to write inefficient code like writel(swab32(foo), ...) when > talking to a PCI device that wants big-endian data. Without the raw > variant, you end up with a double swap on big-endian architectures. > > sparc64 looks wrong, since __raw_writeq() seems identical to writeq(), > which seems to imply it's going to swab what is stores. > OK. Can we please stop hacking around this in drivers and a) work out what it's supposed to do b) document that (Documentation/DocBook/deviceiobook.tmpl or code comment or whatever) c) tell arch maintainers? _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
