Re: ZONE_PADDING wastes 4 bytes of the new cacheline

Andrea Arcangeli
2004-10-21T13:00:24Z

On Thu, Oct 21, 2004 at 12:51:18PM +0200, Mikael Pettersson wrote:
> Have you verified that? GCCs up to and including 2.95.3 and
> early versions of 2.96 miscompiled the kernel when spinlocks
> where empty structs on UP. I.e., you might not get a compile-time
> error but runtime corruption instead.

peraphs we should add a check on the compiler and force people to use
gcc >= 3?

Otherwise adding an #ifdef will fix 2.95, just like the spinlock does in
UP.

btw, the only machine where I still have gcc 2.95.3 is not uptodate
enough to run 2.6 regardless of the fact 2.6 could compile on such
machine or not.