On Wed, Oct 03, 2018 at 02:26:05AM -0700, Maciej Żenczykowski wrote: > While on a 32-bit arch the tail pointer is 32 bits, the struct itself > contains (and has always contained) a 64-bit value 'quota' with a > forced 64-bit alignment which forces 64-bit alignment of the entire > struct and thus also forces tail padding to make it a multiple of > 64-bits. ie. size doesn't change - even on 32 bits. > > Chenbo was testing compatibility on both 32 and 64 bit x86 VMs. Great! Hopefully this is my last question. Thanks for addressing them all.