Hi, our CI discovered that after https://git.kernel.dk/cgit/fio/commit/?id=5ad80fa7cf5be0399c8d9d68967781e56a767c82 fio fails to build on s390x and armv7 (the builders use Fedora 31). ... CC t/read-to-pipe-async.o LINK t/read-to-pipe-async CC t/io_uring.o t/io_uring.c: In function ‘io_uring_register_buffers’: t/io_uring.c:103:17: error: ‘__NR_sys_io_uring_register’ undeclared (first use in this function); did you mean ‘SYS_io_uring_register’? 103 | return syscall(__NR_sys_io_uring_register, s->ring_fd, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ | SYS_io_uring_register t/io_uring.c:103:17: note: each undeclared identifier is reported only once for each function it appears in t/io_uring.c: In function ‘io_uring_register_files’: t/io_uring.c:120:17: error: ‘__NR_sys_io_uring_register’ undeclared (first use in this function); did you mean ‘SYS_io_uring_register’? 120 | return syscall(__NR_sys_io_uring_register, s->ring_fd, | ^~~~~~~~~~~~~~~~~~~~~~~~~~ | SYS_io_uring_register t/io_uring.c: In function ‘io_uring_setup’: t/io_uring.c:126:17: error: ‘__NR_sys_io_uring_setup’ undeclared (first use in this function); did you mean ‘SYS_io_uring_setup’? 126 | return syscall(__NR_sys_io_uring_setup, entries, p); | ^~~~~~~~~~~~~~~~~~~~~~~ | SYS_io_uring_setup t/io_uring.c: In function ‘io_uring_enter’: t/io_uring.c:132:17: error: ‘__NR_sys_io_uring_enter’ undeclared (first use in this function); did you mean ‘SYS_io_uring_enter’? 132 | return syscall(__NR_sys_io_uring_enter, s->ring_fd, to_submit, | ^~~~~~~~~~~~~~~~~~~~~~~ | SYS_io_uring_enter t/io_uring.c: In function ‘io_uring_register_buffers’: t/io_uring.c:105:1: warning: control reaches end of non-void function [-Wreturn-type] 105 | } | ^ t/io_uring.c: In function ‘io_uring_register_files’: t/io_uring.c:122:1: warning: control reaches end of non-void function [-Wreturn-type] 122 | } | ^ t/io_uring.c: In function ‘io_uring_setup’: t/io_uring.c:127:1: warning: control reaches end of non-void function [-Wreturn-type] 127 | } | ^ t/io_uring.c: In function ‘io_uring_enter’: t/io_uring.c:134:1: warning: control reaches end of non-void function [-Wreturn-type] 134 | } | ^ make: *** [Makefile:380: t/io_uring.o] Chyba 1 Thanks, Dan