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/
