r368055 arichardson Nov. 26, 2020, 1:31 p.m.
Instead of using a simple global++ as the data race, with this change we
perform the increment by loading the global, delaying for a bit and then
storing back the incremented value. If I move the increment outside of the
mutex protected range, I can now see the data race with only 100 iterations
on amd64 in almost all cases. Before this change such a racy test almost
always passed with < 100,000 iterations and only reliably failed with the
current limit of 10 million.

I noticed this poorly written test because the mutex:mutex{2,3} and
timedmutex:mutex{2,3} tests were always timing out on our CheriBSD Jenkins.
Writing good concurrency tests is hard so I won't attempt to do so, but this
change should make the test more likely to fail if pthread_mutex_lock is not
implemented correctly while also significantly reducing the time it takes to
run these four tests. It will also reduce the time it takes for QEMU RISC-V
testsuite runs by almost 40 minutes (out of currently 7 hours).

Reviewed By:	brooks, ngie
Differential Revision: https://reviews.freebsd.org/D26473
r368053 kaktus Nov. 26, 2020, 9:07 a.m.
Reported by:	jhb
MFC with:	r368022
r368052 phk Nov. 26, 2020, 7:34 a.m.
Reviewed by:	avg
r368048 mjg Nov. 26, 2020, 6:59 a.m.
thread_init is a much better fit as the the value is constant after
r368047 grehan Nov. 26, 2020, 5:58 a.m.
This is	a relic	from when these	instructions weren't supported by the toolchain.
No functional change.

Submitted by:	adam_fenn.io
Reviewed by:	grehan
Approved by:	grehan (bhyve)
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D27130
r368046 asomers Nov. 26, 2020, 4:55 a.m.
MFC-with:	r368045
r368045 asomers Nov. 26, 2020, 4:29 a.m.
There is now a single ping binary, which chooses to use ICMP or ICMPv4
based on the -4 and -6 options, and the format of the address.

Submitted by:	Ján Sučan <sucanjan@gmail.com>
Sponsored by:	Google LLC (Google Summer of Code 2019)
MFC after:	Never
Differential Revision:	https://reviews.freebsd.org/D21377
r368044 mav Nov. 26, 2020, 2:14 a.m.
r368043 mav Nov. 26, 2020, 1:59 a.m.
r368042 ian Nov. 26, 2020, 1:40 a.m.
processor, and its associated license text (which is similar to a
bsd-3-clause, but with a prohibition against decompiling).  Install a copy
of the license in /usr/share/doc/legal/imx, to comply with the license terms
that requires a copy of the license to be delivered along with the firmware.

Obtained from:	https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/imx/sdma/sdma-imx6q.bin https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/LICENSE.sdma_firmware
r368041 sobomax Nov. 25, 2020, 11:19 p.m.
i386 and the rest of supported architectures by defining KERNLOAD in the
vmparam.h and getting rid of magic constant in the linker script, which albeit
documented via comment but isn't programmatically accessible at a compile time.

Use KERNLOAD to eliminate another (matching) magic constant 100 lines down
inside unremarkable TU "copy.c" 3 levels deep in the EFI loader tree.

Reviewed by:	markj
Approved by:	markj
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D27355
r368040 jhb Nov. 25, 2020, 11:17 p.m.
This subsumes some of the content from tcp(4) describing the socket
options but also adds additional notes.

Reviewed by:	gallatin, hselasky
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D27272
r368039 mjg Nov. 25, 2020, 10:53 p.m.
The commited patch was incomplete.

- add back missing goto retry, noted by jhb
- 'if (error)'  -> 'if (error != 0)'
- consistently do:

if (error != 0)

instead of:

if (error != 0)

This adds some 'continue' uses which are not needed, but line up with the
rest of pipe_write.
r368038 mjg Nov. 25, 2020, 9:41 p.m.
r368031 bz Nov. 25, 2020, 8:58 p.m.
Enable ND6_IFF_IFDISABLED when the interface is created in the
kernel before return to user space.

This avoids a race when an interface is create by a program which
also calls ifconfig IF inet6 -ifdisabled and races with the
devd -> /etc/pccard_ether -> .. netif start IF -> ifdisabled
calls (the devd/rc framework disabling IPv6 again after the program
had enabled it already).

In case the global net.inet6.ip6.accept_rtadv was turned on,
we also default to enabling IPv6 on the interfaces, rather than
disabling them.

PR:		248172
Reported by:	Gert Doering (gert greenie.muc.de)
Reviewed by:	glebius (, phk)
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D27324