I've been getting some of these warning emails from the KTR. I think this is in reference to this patch, which adds a 64-bit try_cmpxchg in the timestamp handling code: https://lore.kernel.org/linux-fsdevel/20240708-mgtime-v4-0-a0f3c6fb57f3@kernel.org/ On m68k, there is a prototype for __invalid_cmpxchg_size, but no actual function, AFAICT. Should that be defined somewhere, or is this a deliberate way to force a build break in this case? More to the point though: do I need to do anything special for m86k here (or for other arches that can't do a native 64-bit cmpxchg)? Thanks, -- Jeff Layton