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6394a3a61c
MAX_BACKENDS influences many things besides postmaster. I e.g. noticed that we don't have static assertions ensuring BUF_REFCOUNT_MASK is big enough for MAX_BACKENDS, adding them would require including postmaster.h in buf_internals.h which doesn't seem right. While at that, add MAX_BACKENDS_BITS, as that's useful in various places for static assertions (to be added in subsequent commits). Reviewed-by: Thomas Munro <thomas.munro@gmail.com> Discussion: https://postgr.es/m/wptizm4qt6yikgm2pt52xzyv6ycmqiutloyvypvmagn7xvqkce@d4xuv3mylpg4