linux/kernel/rcu
Paul E. McKenney 96017bf903 rcu-tasks: Simplify trc_read_check_handler() atomic operations
Currently, trc_wait_for_one_reader() atomically increments
the trc_n_readers_need_end counter before sending the IPI
invoking trc_read_check_handler().  All failure paths out of
trc_read_check_handler() and also from the smp_call_function_single()
within trc_wait_for_one_reader() must carefully atomically decrement
this counter.  This is more complex than it needs to be.

This commit therefore simplifies things and saves a few lines of
code by dispensing with the atomic decrements in favor of having
trc_read_check_handler() do the atomic increment only in the success case.
In theory, this represents no change in functionality.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
2021-09-15 11:37:50 -07:00
..
Kconfig Merge branches 'doc.2021.01.06a', 'fixes.2021.01.04b', 'kfree_rcu.2021.01.04a', 'mmdumpobj.2021.01.22a', 'nocb.2021.01.06a', 'rt.2021.01.04a', 'stall.2021.01.06a', 'torture.2021.01.12a' and 'tortureall.2021.01.06a' into HEAD 2021-01-22 15:26:44 -08:00
Kconfig.debug rcu: Restrict RCU_STRICT_GRACE_PERIOD to at most four CPUs 2021-05-10 16:22:54 -07:00
Makefile rcuperf: Change rcuperf to rcuscale 2020-08-24 18:39:24 -07:00
rcu_segcblist.c rcu/nocb: Remove stale comment above rcu_segcblist_offload() 2021-03-15 13:54:54 -07:00
rcu_segcblist.h rcu/nocb: Code-style nits in callback-offloading toggling 2021-01-06 16:47:55 -08:00
rcu.h Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 2021-05-18 10:56:19 -07:00
rcuscale.c rcuscale: Console output claims too few grace periods 2021-07-27 11:39:30 -07:00
rcutorture.c rcutorture: Preempt rather than block when testing task stalls 2021-07-27 11:39:30 -07:00
refscale.c refscale: Add measurement of clock readout 2021-07-27 11:38:56 -07:00
srcutiny.c srcutiny: Mark read-side data races 2021-08-06 13:41:48 -07:00
srcutree.c Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 2021-05-18 10:56:19 -07:00
sync.c rcu: Fix various typos in comments 2021-05-12 12:11:05 -07:00
tasks.h rcu-tasks: Simplify trc_read_check_handler() atomic operations 2021-09-15 11:37:50 -07:00
tiny.c srcu: Initialize SRCU after timers 2021-05-10 16:03:35 -07:00
tree_exp.h rcu/tree: Add a trace event for RCU CPU stall warnings 2021-03-15 13:53:24 -07:00
tree_nocb.h rcu/nocb: Start moving nocb code to its own plugin file 2021-07-20 13:41:51 -07:00
tree_plugin.h Updates for locking and atomics: 2021-08-30 14:26:36 -07:00
tree_stall.h rcu: Use per_cpu_ptr to get the pointer of per_cpu variable 2021-08-06 13:41:49 -07:00
tree.c Merge branches 'doc.2021.07.20c', 'fixes.2021.08.06a', 'nocb.2021.07.20c', 'nolibc.2021.07.20c', 'tasks.2021.07.20c', 'torture.2021.07.27a' and 'torturescript.2021.07.27a' into HEAD 2021-08-10 11:00:53 -07:00
tree.h Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 2021-05-18 10:56:19 -07:00
update.c Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 2021-05-18 10:56:19 -07:00