On 02/03/2010 10:47 AM, Peter Zijlstra wrote: > On Wed, 2010-02-03 at 19:14 +0100, Borislav Petkov wrote: > >> alternative("call hweightXX", "popcnt", X86_FEATURE_POPCNT) > > Make sure to apply a 0xff bitmask to the popcnt r16 call for hweight8(), > and hweight64() needs a bit of magic for 32bit, but yes, something like > that ought to work nicely. > Arguably the "best" option is to have the alternative being a jump to an out-of-line stub which does the necessary parameter marshalling before calling a stub. This technique is already used in a few other places. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html