linux(4): Update syscalls.master to 6.5

MFC after: 1 week

linux(4): Remove sys/cdefs.h inclusion where it's not needed due to 685dc743

sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

linux(4): Add a dedicated ioprio system calls

On Linux these system calls have an effect only when used in conjuction
with an I/O scheduler that supports I/O priorities. If no I/O scheduler
has been set for a thread, then by defaut the I/O priority will follow
the CPU nice value. Due to FreeBSD lack of I/O scheduler facilities, the
default Linux behavior is implemented.

Ubuntu 23.04 debootstrap requires Linux ionice which depends on these
syscalls.

Differential Revision: https://reviews.freebsd.org/D41153
MFC after: 1 month

linux(4): Implement xattr syscalls

Reviewed by:
Differential revision: https://reviews.freebsd.org/D35544
MFC after: 1 month

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

linux(4): Implement close_range over native

Handling of the CLOSE_RANGE_UNSHARE flag is not implemented due to
difference in fd unsharing mechanism in the Linux and FreeBSD.

Reviewed by: mjg
Differential revision: https://reviews.freebsd.org/D39398
MFC after: 2 weeks

linux(4): Cleanup includes under compat/linux

Cleanup unneeded includes, sort the rest according to style(9).
No functional changes.

MFC after: 2 weeks

linux(4): Add epoll_pwai2 syscall.

MFC after: 2 weeks

linux(4): Add a simple rseq syscall implementation.

To avoid annoyng messages from glibc-2.35 test suite add the simple
implementation of rseq syscall which is do nothing for now.

I plan to implement it if and when the API stabilizes.

MFC after: 2 weeks

linux: Provide dummy seccomp(2)

Don't emit messages; this isn't any different from a Linux kernel
built without OPTIONS_SECCOMP, so the userspace already needs to know
how to deal with it. This is also similar with how we handle seccomp
in linux_prctl().

Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D33808

linux(4): Remove clone3 and faccessat2 from dummy.

MFC after: 2 weeks

Drop "All rights reserved" from my copyright statements.

Add email and fixup years while here.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D30912
MFC after: 2 weeks

linux: implement statx(2)

PR: 252106
Reviewed By: dchagin
Differential Revision: https://reviews.freebsd.org/D30466

linux: deduplicate DUMMY() entries

No functional changes.

Reviewed By: emaste
Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D30524

linux: add new syscall numbers

Sponsored By: EPSRC
Differential Revision: https://reviews.freebsd.org/D30193

linux(4): Implement name_to_handle_at(), open_by_handle_at()

They are similar to our getfhat(2) and fhopen(2) syscalls.

Differential Revision: https://reviews.freebsd.org/D27111

linux(4): Fix loadable modules after r367395

Move dtrace SDT definitions into linux_common module code. Also, build
linux_dummy.c into the linux_common kld -- we don't need separate
versions of these stubs for 32- and 64-bit emulation.

Reported by: several
PR: 250897
Discussed with: emaste, trasz
Tested by: John Kennedy, Yasuhiro KIMURA, Oleg Sidorkin
X-MFC-With: r367395
Differential Revision: https://reviews.freebsd.org/D27124

linux(4): Deduplicate unimpl/dummy syscall handlers

No functional change.

Reviewed by: emaste, trasz
Differential Revision: https://reviews.freebsd.org/D27099