On Fri 2007-12-14 14:15:03, Ingo Molnar wrote: > > * David P. Reed <[EMAIL PROTECTED]> wrote: > > > Replace use of outb to "unused" diagnostic port 0x80 for time delay > > with udelay based time delay on x86_64 architecture machines. Fix for > > bugs 9511 and 6307 in bugzilla, plus bugs reported in > > bugzilla.redhat.com. > > > > Derived from suggestion (that didn't compile) by Pavel Machek, and > > tested, also based on measurements of typical timings of out's > > collated by Rene Herman from many in the community. > > > > This patch fixes a number of bugs known to cause problems on HP > > Pavilion dv9000z and dv6000z laptops - in the form of solid freezes > > when hwclock is used to show or set the time. Also, it potentially > > improves bus utilization on SMP machines, by using a waiting process > > that doesn't tie up the ISA/LPC bus for 1 or 2 microseconds. > > > > i386 family fixes (completely parallel) were not included, considering > > that such machines might involve more risk of problems on legacy > > machines. > > wow, cool fix! (I remember that there were other systems as well that > are affected by port 0x80 muckery - i thought we had removed port 0x80 > accesses long ago.) > > how about the simpler fix below, as a first-level approach? We can then > remove the _p in/out sequences after this. > > this is also something for v2.6.24 merging.
As much as I like this patch, I do not think it is suitable for .24. Too risky, I'd say. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
