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
..
alarmtimer.c	alarmtimer: Convert comma to semicolon	2020-08-25 12:45:53 +02:00
clockevents.c
clocksource.c	clocksource: Remove obsolete ifdef	2020-06-09 16:36:47 +02:00
hrtimer.c	treewide: Make all debug_obj_descriptors const	2020-09-24 21:56:25 +02:00
itimer.c	y2038: rename itimerval to __kernel_old_itimerval	2019-12-18 18:07:33 +01:00
jiffies.c	timekeeping: Split jiffies seqlock	2020-03-21 16:00:23 +01:00
Kconfig	posix-cpu-timers: Provide mechanisms to defer timer handling to task_work	2020-08-06 16:50:59 +02:00
Makefile	ns: Introduce Time Namespace	2020-01-14 12:20:48 +01:00
namespace.c	nsproxy: support CLONE_NEWTIME with setns()	2020-07-08 11:14:22 +02:00
ntp_internal.h
ntp.c
posix-clock.c	posix-clocks: Rename the clock_get() callback to clock_get_timespec()	2020-01-14 12:20:49 +01:00
posix-cpu-timers.c	posix-cpu-timers: Provide mechanisms to defer timer handling to task_work	2020-08-06 16:50:59 +02:00
posix-stubs.c	posix-timers: Make clock_nanosleep() time namespace aware	2020-01-14 12:20:55 +01:00
posix-timers.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
posix-timers.h	posix-clocks: Introduce clock_get_ktime() callback	2020-01-14 12:20:51 +01:00
sched_clock.c	time/sched_clock: Use seqcount_latch_t	2020-09-10 11:19:29 +02:00
test_udelay.c
tick-broadcast-hrtimer.c
tick-broadcast.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
tick-common.c	timekeeping: Split jiffies seqlock	2020-03-21 16:00:23 +01:00
tick-internal.h
tick-oneshot.c
tick-sched.c	tick/nohz: Narrow down noise while setting current task's tick dependency	2020-06-29 11:58:50 -07:00
tick-sched.h
time.c	y2038: remove unused time32 interfaces	2020-02-21 11:22:15 -08:00
timeconst.bc
timeconv.c
timecounter.c
timekeeping_debug.c
timekeeping_internal.h	timekeeping/vsyscall: Provide vdso_update_begin/end()	2020-08-06 10:57:30 +02:00
timekeeping.c	These are the locking updates for v5.10:	2020-10-12 13:06:20 -07:00
timekeeping.h	timekeeping: Split jiffies seqlock	2020-03-21 16:00:23 +01:00
timer_list.c
timer.c	Updates for timekeeping, timers and related drivers:	2020-10-12 11:27:54 -07:00
vsyscall.c	timekeeping/vsyscall: Provide vdso_update_begin/end()	2020-08-06 10:57:30 +02:00