Michael Cree [off-list ref] writes:

On Fri, Jul 14, 2017 at 05:59:06AM -0500, Eric W. Biederman wrote:

quoted

in which cases the oddities will happen let alone test them.  Plus at
least for ia64 and alpha those architectures don't appear to be
receiving updates for new syscalls, and no new hardware is being built
so I don't know how much longer they will last.

That is building for alpha gives:

quoted

  CALL    /home/eric/projects/linux/linux-exit-cleanups/scripts/checksyscalls.sh
<stdin>:1239:2: warning: #warning syscall seccomp not implemented [-Wcpp]
<stdin>:1248:2: warning: #warning syscall bpf not implemented [-Wcpp]
<stdin>:1299:2: warning: #warning syscall userfaultfd not implemented [-Wcpp]
<stdin>:1302:2: warning: #warning syscall membarrier not implemented [-Wcpp]
<stdin>:1305:2: warning: #warning syscall mlock2 not implemented [-Wcpp]
<stdin>:1308:2: warning: #warning syscall copy_file_range not implemented [-Wcpp]
<stdin>:1311:2: warning: #warning syscall preadv2 not implemented [-Wcpp]
<stdin>:1314:2: warning: #warning syscall pwritev2 not implemented [-Wcpp]
<stdin>:1317:2: warning: #warning syscall pkey_mprotect not implemented [-Wcpp]
<stdin>:1320:2: warning: #warning syscall pkey_alloc not implemented [-Wcpp]
<stdin>:1323:2: warning: #warning syscall pkey_free not implemented [-Wcpp]
<stdin>:1326:2: warning: #warning syscall statx not implemented [-Wcpp]

Patches to wire up most of those syscalls on Alpha was posted recently
along with others to fix module loading, etc., but unfortunately they
do not appear to have been applied during the merge window...

Odd.

In general wiring up system calls is something that can even happen in
-rc2 or -rc3 as system calls get added in -rc1 and then the
architectures have a chance to send in the small patches wiring the up.
At least that is how I understand the usual rules for being a non-x86
architecture.

Eric