On Wed, May 26, 2021 at 09:07:41AM +0100, Mel Gorman wrote: > + !defined(CONFIG_DEBUG_LOCK_ALLOC) && \ > + !defined(CONFIG_PAHOLE_HAS_ZEROSIZE_PERCPU_SUPPORT) > + /* > + * pahole 1.21 and earlier gets confused by zero-sized per-CPU > + * variables and produces invalid BTF. Ensure that > + * sizeof(struct pagesets) != 0 for older versions of pahole. > + */ > + char __pahole_hack; > + #warning "pahole too old to support zero-sized struct pagesets" > +#endif Err, hell no. We should not mess up the kernel for broken tools that are not relevant to the kernel build itself ever.
