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/

spdx: The BSD-2-Clause-NetBSD identifier is obsolete, drop -NetBSD

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

spdx: The BSD-2-Clause-NetBSD identifier is obsolete, drop -NetBSD

The SPDX folks have obsoleted the BSD-2-Clause-NetBSD 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

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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): Get rid of the opt_compat.h include.

Since e013e369 COMPAT_LINUX, COMPAT_LINUX32 build options are removed,
so include of opt_compat.h is no more needed.

MFC after: 2 weeks

linux(4): make getcwd(2) return ERANGE instead of ENOMEM

For native FreeBSD binaries, the return value from __getcwd(2)
doesn't really matter, as the libc wrapper takes over and returns
the proper e

linux(4): make getcwd(2) return ERANGE instead of ENOMEM

For native FreeBSD binaries, the return value from __getcwd(2)
doesn't really matter, as the libc wrapper takes over and returns
the proper errno.

PR: kern/254120
Reported By: Alex S <iwtcex@gmail.com>
Reviewed By: kib
Sponsored By: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D29217

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MFH

Sponsored by: Rubicon Communications, LLC (netgate.com)

cache: drop the always curthread argument from reverse lookup routines

Note VOP_VPTOCNP keeps getting it as temporary compatibility for zfs.

Tested by: pho

Merge ^/head r357368 through r357388.

cache: replace kern___getcwd with vn_getcwd

The previous routine was resulting in extra data copies most notably in
linux_getcwd.

MFHead @348740

Sponsored by: The FreeBSD Foundation

Linuxulator depends on a fundamental kernel settings such as SMP. Many
of them listed in opt_global.h which is not generated while building
modules outside of a kernel and such modules never match re

Linuxulator depends on a fundamental kernel settings such as SMP. Many
of them listed in opt_global.h which is not generated while building
modules outside of a kernel and such modules never match real cofigured
kernel.

So, we should prevent our users from building obviously defective modules.

Therefore, remove the root cause of the building of modules outside of a
kernel - the possibility of building modules with DEBUG or KTR flags.
And remove all of DEBUG printfs as it is incomplete and in threaded
programms not informative, also a half of system call does not have DEBUG
printf. For debuging Linux programms we have dtrace, ktr and ktrace ability.

PR: 222861
Reviewed by: trasz
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D20178

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sys/compat: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - er

sys/compat: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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Catch up with HEAD (r280229-r284686).

MFH: r282615-r283655

Sponsored by: The FreeBSD Foundation

Merge sync of head

Where possible we will use M_LINUX malloc(9) type.
Move M_FUTEX defines to the linux_common.ko.

Differential Revision: https://reviews.freebsd.org/D1077
Reviewed by: emaste

Merge from head

MFH: r281855-r282312

Sponsored by: The FreeBSD Foundation

Simplify linux_getcwd(), removing code that was longer used.

Differential Revision: https://reviews.freebsd.org/D2326
Reviewed by: dchagin@, kib@
MFC after: 1 month
Sponsored by: The FreeBSD Foundat

Simplify linux_getcwd(), removing code that was longer used.

Differential Revision: https://reviews.freebsd.org/D2326
Reviewed by: dchagin@, kib@
MFC after: 1 month
Sponsored by: The FreeBSD Foundation

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MFH: r280643-r281852

Sponsored by: The FreeBSD Foundation

Modify kern___getcwd() to take max pathlen limit as an additional
argument. This will be used for the Linux emulation layer - for Linux,
PATH_MAX is 4096 and not 1024.

Differential Revision: https:

Modify kern___getcwd() to take max pathlen limit as an additional
argument. This will be used for the Linux emulation layer - for Linux,
PATH_MAX is 4096 and not 1024.

Differential Revision: https://reviews.freebsd.org/D2335
Reviewed by: kib@
MFC after: 1 month
Sponsored by: The FreeBSD Foundation

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MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation