> Yeah,  I forgot I have a #ifndef writeq, then defined the x86_64 version
 > of that.   I've not tested on x86, so I'm not sure whether it works.
 > How are you handling writeq when its not defined, as the case in x86?

Write two writel() inside a spinlock to avoid any transactions in the
middle (the HW I'm dealing with can deal with two 32-bit transactions,
as long as nothing comes in the middle).  If your hardware demands a
single 64-bit transaction, you may be in trouble, because I'm not sure
all 32-bit systems can generate such a PCIe transaction.

You can see include/linux/mlx4/doorbell.h for exactly what I did.

 - R.
--
unsubscribe notice
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/