Linus Torvalds ed016af52e These are the locking updates for v5.10: ... - Add deadlock detection for recursive read-locks. The rationale is outlined in: 224ec489d3cd: ("lockdep/Documention: Recursive read lock detection reasoning") The main deadlock pattern we want to detect is: TASK A: TASK B: read_lock(X); write_lock(X); read_lock_2(X); - Add "latch sequence counters" (seqcount_latch_t): A sequence counter variant where the counter even/odd value is used to switch between two copies of protected data. This allows the read path, typically NMIs, to safely interrupt the write side critical section. We utilize this new variant for sched-clock, and to make x86 TSC handling safer. - Other seqlock cleanups, fixes and enhancements - KCSAN updates - LKMM updates - Misc updates, cleanups and fixes. Signed-off-by: Ingo Molnar <mingo@kernel.org> -----BEGIN PGP SIGNATURE----- iQJFBAABCgAvFiEEBpT5eoXrXCwVQwEKEnMQ0APhK1gFAl+EX6QRHG1pbmdvQGtl cm5lbC5vcmcACgkQEnMQ0APhK1g3gxAAkg+Jy/tcdRxlxlEDOQPFy1mBqvFmulNA pGFPkB6dzqmAWF/NfOZSl4g/h/mqGYsq2V+PfK5E8Sq8DQ/yCmnLhjgVOHNUUliv x0WWfOysNgJdtdf69NLYJufIQhxhyI0dwFHHoHIsCdGdGqjh2DVevQFPFTBjdpOc BUZYo+u3gCaCdB6A2nmlcWYbEw8eVEHgv3qLG6dq46J0KJOV0HfliqJoU3EZqH+s 977LvEIo+THfuYWMo/Jepwngbi0y36KeeukOAdwm9fK196htBHIUR+YPPrAe+FWD z+UXP5IS5XIw9V1sGLmUaC2m+6gpdW19jKBtlzPkxHXmJmsgiZdLLeytEh3WYey7 nzfH+9Jd4NyyZKucLssYkOjf6P5BxGKCyJ9LXb7vlSthIhiDdFNx47oKtW4hxjOY jubsI3BP5c3G1sIBIjTS53XmOhJg+Z52FxTpQ33JswXn1wGidcHZiuNHZuU5q28p +tn8rGb2NGJFb4Sw/Vp0yTcqIpEXf+vweiQoaxm6tc9BWzcVzZntGnh0i3gFotx/ VgKafN4+pgXgo6bwHbN2WBK2FGyvcXFaptfaOMZL48En82hJ1DI6EnBEYN+vuERQ JcCXg+iHeeVbxoou7q8NJxITkBmEL5xNBIugXRRqNSP3fXLxKjFuPYqT84/e7yZi elGTReYcq6g= =Iq51 -----END PGP SIGNATURE----- Merge tag 'locking-core-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull locking updates from Ingo Molnar: "These are the locking updates for v5.10: - Add deadlock detection for recursive read-locks. The rationale is outlined in commit 224ec489d3 ("lockdep/ Documention: Recursive read lock detection reasoning") The main deadlock pattern we want to detect is: TASK A: TASK B: read_lock(X); write_lock(X); read_lock_2(X); - Add "latch sequence counters" (seqcount_latch_t): A sequence counter variant where the counter even/odd value is used to switch between two copies of protected data. This allows the read path, typically NMIs, to safely interrupt the write side critical section. We utilize this new variant for sched-clock, and to make x86 TSC handling safer. - Other seqlock cleanups, fixes and enhancements - KCSAN updates - LKMM updates - Misc updates, cleanups and fixes" * tag 'locking-core-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (67 commits) lockdep: Revert "lockdep: Use raw_cpu_*() for per-cpu variables" lockdep: Fix lockdep recursion lockdep: Fix usage_traceoverflow locking/atomics: Check atomic-arch-fallback.h too locking/seqlock: Tweak DEFINE_SEQLOCK() kernel doc lockdep: Optimize the memory usage of circular queue seqlock: Unbreak lockdep seqlock: PREEMPT_RT: Do not starve seqlock_t writers seqlock: seqcount_LOCKNAME_t: Introduce PREEMPT_RT support seqlock: seqcount_t: Implement all read APIs as statement expressions seqlock: Use unique prefix for seqcount_t property accessors seqlock: seqcount_LOCKNAME_t: Standardize naming convention seqlock: seqcount latch APIs: Only allow seqcount_latch_t rbtree_latch: Use seqcount_latch_t x86/tsc: Use seqcount_latch_t timekeeping: Use seqcount_latch_t time/sched_clock: Use seqcount_latch_t seqlock: Introduce seqcount_latch_t mm/swap: Do not abuse the seqcount_t latching API time/sched_clock: Use raw_read_seqcount_latch() during suspend ...		2020-10-12 13:06:20 -07:00
..
accounting	SPDX patches for 5.7-rc1.	2020-04-03 13:12:26 -07:00
arch	x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()	2020-10-06 11:18:04 +02:00
bootconfig	tools/bootconfig: Add testcase for tailing space	2020-09-21 21:57:12 -04:00
bpf	tools/bpftool: Support passing BPFTOOL_VERSION to make	2020-09-19 01:06:05 +02:00
build	perf build-ids: Fall back to debuginfod query if debuginfo not found	2020-08-14 09:51:14 -03:00
cgroup	tools/cgroup: add memcg_slabinfo.py tool	2020-08-07 11:33:25 -07:00
debugging
edid
firewire
firmware
gpio	tools: gpio: fix spurious close warning in gpio-event-mon	2020-07-12 10:22:01 +02:00
hv	tools: hv: change http to https in hv_kvp_daemon.c	2020-07-06 10:46:23 +00:00
iio
include	tools headers UAPI: update linux/in.h copy	2020-09-14 19:06:41 -03:00
io_uring	tools/io_uring: fix compile breakage	2020-09-21 07:50:58 -06:00
kvm/kvm_stat	tools/kvm_stat: add sample systemd unit file	2020-04-21 09:13:12 -04:00
laptop	change email address for Pali Rohár	2020-04-10 15:36:22 -07:00
leds
lib	libbpf: Fix XDP program load regression for old kernels	2020-09-24 10:33:02 -07:00
memory-model	tools/memory-model: Expand the cheatsheet.txt notion of relaxed	2020-09-04 11:58:15 -07:00
nfsd
objtool	These are the locking updates for v5.10:	2020-10-12 13:06:20 -07:00
pci	tools: PCI: Add 'e' to clear IRQ	2020-04-02 17:57:10 +01:00
pcmcia
perf	* Extend the recovery from MCE in kernel space also to processes which	2020-10-12 10:14:38 -07:00
power	ACPI updates for 5.9-rc1	2020-08-03 20:37:22 -07:00
scripts
spi	spi: tools: Make default_tx/rx and input_tx static	2020-06-11 16:27:24 +01:00
testing	Scheduler changes for v5.10:	2020-10-12 12:56:01 -07:00
thermal/tmon	- Convert tsens configuration DT binding to yaml (Rajeshwari)	2020-04-07 20:00:16 -07:00
time
usb	tools: usb: move to tools buildsystem	2020-08-19 14:11:44 +02:00
virtio	virtio: fixes, features	2020-08-11 14:34:17 -07:00
vm	mm: Add PG_arch_2 page flag	2020-09-04 12:46:06 +01:00
wmi
Makefile	bpf: Compile resolve_btfids tool at kernel compilation start	2020-07-13 10:42:02 -07:00