kernel/include/linux/threads.h
.. .. @@ -29,7 +29,7 @@ 29 29 30 30 /* 31 31 * A maximum of 4 million PIDs should be enough for a while. 32 - * [NOTE: PID/TIDs are limited to 2^29 ~= 500+ million, see futex.h.]32 + * [NOTE: PID/TIDs are limited to 2^30 ~= 1 billion, see FUTEX_TID_MASK.]33 33 */ 34 34 #define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \ 35 35 (sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))