On Wed, 2005-01-26 at 10:34 -0600, Brian King wrote: > Here is the last one. I've looked at making userspace sleep until BIST > is finished. The downside I see to this is that is complicates the patch > due to the following reasons: > > 1. In order to also make this work for Ben's PPC power management usage > would require an additional flag and additional APIs to set and clear > the flag. > 2. Since BIST can be run at interrupt context, the interfaces to block > and unblock userspace accesses across BIST must be callable from > interrupt context. This prevents the usage of semaphores or simple > wait_event macros and requires new macros that carefully check the new > pci device flag and manage the spinlock. >
Well, I honestly think that this is unnecessary burden. I think that just dropping writes & returning data from the cache on reads is enough, blocking userspace isn't necessary, but then, I may be wrong ;) Ben. - 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/
