On Thu, Sep 08, 2011 at 08:09:11PM -0500, Richard Kuo wrote: > + asm volatile( > + "memb(%0) = %1;" > + : > + : "r" (addr), "r" (data) > + ); I'm kind-of vague on this, but I think that this also needs a : "memory" at the end (to indicate that the asm snippet clobbers memory), as otherwise the compiler may be tempted to reorder these around other memory accesses. That is, the "volatile" keyword is not enough (well, I'm not sure...), but I think "volatile" only prevents the compiler from optimizing these away completely, but is not enough to prevent unwanted re-ordering. --linas -- Sent by an employee of the Qualcomm Innovation Center, Inc. The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
