src/sys/compat/linux/linux_util.c, branch releng/12.2

MFC r362104:

2020-08-24T12:51:20Z

Add compat.linux.debug sysctl, to make it possible to silence down the debug messages. While here, clean up some variable naming. Sponsored by: The FreeBSD Foundation

MFC r355818:

2020-08-23T20:25:10Z

Add compat.linux.emul_path, so it can be set to something other than "/compat/linux". Useful when you have several compat directories with different Linux versions and you don't want to clash with files installed by linux-c7 packages. Sponsored by: The FreeBSD Foundation

Move most of the contents of opt_compat.h to opt_global.h.

2018-04-06T17:35:35Z

opt_compat.h is mentioned in nearly 180 files. In-progress network driver compabibility improvements may add over 100 more so this is closer to "just about everywhere" than "only some files" per the guidance in sys/conf/options. Keep COMPAT_LINUX32 in opt_compat.h as it is confined to a subset of sys/compat/linux/*.c. A fake _COMPAT_LINUX option ensure opt_compat.h is created on all architectures. Move COMPAT_LINUXKPI to opt_dontuse.h as it is only used to control the set of compiled files. Reviewed by: kib, cem, jhb, jtl Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D14941

Linuxulator: apply style(9) to return

2018-03-12T15:35:24Z

Sponsored by: Turing Robotic Industries Inc.

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

2017-11-27T15:13:23Z

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.

Add special handling for current in-tree drm devices, like r323692 added

2017-10-15T16:08:22Z

for drm-next.

Use sizeof instead of strlen on string constants. The compiler doesn't

2017-10-15T16:03:45Z

optimise the strlen calls away with -ffreestanding.

linsysfs(5): Add support for recent libdrm

2017-09-17T23:40:16Z

Expose more information about PCI devices (and GPUs in particular) via linsysfs to libdrm. This allows unmodified modern 64-bit Linux libdrm to work, which allows modern Linux Mesa to work. The submitter reports that he tested the change with an Ubuntu 16.04 chroot + amdgpu from graphics/drm-next-kmod. PR: 222375 Submitted by: Greg V

Implement epoll family system calls. This is a tiny wrapper

2015-05-24T16:41:39Z

around kqueue() to implement epoll subset of functionality. The kqueue user data are 32bit on i386 which is not enough for epoll user data, so we keep user data in the proc emuldata. Initial patch developed by rdivacky@ in 2007, then extended by Yuri Victorovich @ r255672 and finished by me in collaboration with mjg@ and jillies@. Differential Revision: https://reviews.freebsd.org/D1092

Where possible we will use M_LINUX malloc(9) type.

2015-05-24T16:14:41Z

Move M_FUTEX defines to the linux_common.ko. Differential Revision: https://reviews.freebsd.org/D1077 Reviewed by: emaste