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.
- R.
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