On Mon, Apr 21, 2014 at 6:14 PM, H. Peter Anvin <h...@zytor.com> wrote: > I wanted to avoid the "another cpu made this allocation, now I have to free" > crap, but I also didn't want to grab the lock if there was no work needed.
I guess you also want to avoid bouncing all these cachelines around on boot on bit multicore machines. I'd advocate using the bitmap approach or simplifying the existing code. For example: + for (n = 0; n < ESPFIX_PUD_CLONES; n++) { + pud = ACCESS_ONCE(pud_p[n]); + if (!pud_present(pud)) + return false; + } I don't see why that needs to be a loop. How can one clone exist but not the others? --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/