On Wed, 28 Aug 2013, H. Peter Anvin wrote: > On 08/28/2013 12:16 PM, Alan Stern wrote: > > Russell, Peter, and Ingo: > > > > Can you folks enlighten us regarding this issue for some common > > architectures? > > > > On x86, IRET is a serializing instruction; it guarantees hard > serialization of absolutely everything.
That answers half of the question. What about the other half? Does the CPU automatically serialize everything when it takes an interrupt? > I would expect architectures that have weak memory ordering to put > appropriate barriers in the IRQ entry/exit code. Then would it be acceptable to mention this in the memory-barriers.txt file? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
