On Fri, Sep 02, 2016 at 04:16:54PM -0400, Alan Stern wrote: > > Actually, that's not entirely true (although presumably it works okay > for most architectures).
Yeah, all load-store archs (with exception of PowerPC and ARM64 and possibly MIPS) implement ACQUIRE with a general fence (after the ll/sc). ( and MIPS doesn't use their fancy barriers in Linux ) PowerPC does the full fence for smp_mb__before_spinlock, which leaves ARM64, I'm not sure its correct, but I'm way too tired to think about that now. The TSO archs imply full barriers with all atomic RmW ops and are therefore also good. -- 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
