user/sven/linux.git/include/linux/srcutiny.h, branch v6.1.162

srcu: Make Tiny SRCU use full-sized grace-period counters

2022-08-31T12:10:15Z

This commit makes Tiny SRCU use full-sized grace-period counters to further avoid counter-wrap issues when using polled grace-period APIs. Signed-off-by: Paul E. McKenney

srcu: Add GP and maximum requested GP to Tiny SRCU rcutorture output

2022-08-31T12:10:15Z

This commit adds the ->srcu_idx and ->srcu_max_idx fields to the Tiny SRCU rcutorture output for additional diagnostics. Signed-off-by: Paul E. McKenney

srcutiny: Mark read-side data races

2021-08-06T20:41:48Z

This commit marks some interrupt-induced read-side data races in __srcu_read_lock(), __srcu_read_unlock(), and srcu_torture_stats_print(). Signed-off-by: Paul E. McKenney

srcu: Provide polling interfaces for Tiny SRCU grace periods

2021-01-04T21:53:38Z

There is a need for a polling interface for SRCU grace periods, so this commit supplies get_state_synchronize_srcu(), start_poll_synchronize_srcu(), and poll_state_synchronize_srcu() for this purpose. The first can be used if future grace periods are inevitable (perhaps due to a later call_srcu() invocation), the second if future grace periods might not otherwise happen, and the third to check if a grace period has elapsed since the corresponding call to either of the first two. As with get_state_synchronize_rcu() and cond_synchronize_rcu(), the return value from either get_state_synchronize_srcu() or start_poll_synchronize_srcu() must be passed in to a later call to poll_state_synchronize_srcu(). Link: https://lore.kernel.org/rcu/20201112201547.GF3365678@moria.home.lan/ Reported-by: Kent Overstreet [ paulmck: Add EXPORT_SYMBOL_GPL() per kernel test robot feedback. ] [ paulmck: Apply feedback from Neeraj Upadhyay. ] Link: https://lore.kernel.org/lkml/20201117004017.GA7444@paulmck-ThinkPad-P72/ Reviewed-by: Neeraj Upadhyay Signed-off-by: Paul E. McKenney

srcu: Make Tiny SRCU use multi-bit grace-period counter

2021-01-04T21:53:36Z

There is a need for a polling interface for SRCU grace periods. This polling needs to distinguish between an SRCU instance being idle on the one hand or in the middle of a grace period on the other. This commit therefore converts the Tiny SRCU srcu_struct structure's srcu_idx from a defacto boolean to a free-running counter, using the bottom bit to indicate that a grace period is in progress. The second-from-bottom bit is thus used as the index returned by srcu_read_lock(). Link: https://lore.kernel.org/rcu/20201112201547.GF3365678@moria.home.lan/ Reported-by: Kent Overstreet [ paulmck: Fix ->srcu_lock_nesting[] indexing per Neeraj Upadhyay. ] Reviewed-by: Neeraj Upadhyay Signed-off-by: Paul E. McKenney

linux/srcu: Convert to SPDX license identifier

2019-02-09T16:45:59Z

Replace the license boiler plate with a SPDX license identifier. While in the area, update an email address. Signed-off-by: Paul E. McKenney [ paulmck: Update ,h SPDX format per Joe Perches. ] Reviewed-by: Thomas Gleixner

srcu: Use "ssp" instead of "sp" for srcu_struct pointer

2018-11-27T17:24:17Z

In RCU, the distinction between "rsp", "rnp", and "rdp" has served well for a great many years, but in SRCU, "sp" vs. "sdp" has proven confusing. This commit therefore renames SRCU's "sp" pointers to "ssp", so that there is "ssp" for srcu_struct pointer, "snp" for srcu_node pointer, and "sdp" for srcu_data pointer. Signed-off-by: Paul E. McKenney

kernel/SRCU: provide a static initializer

2018-05-30T08:11:34Z

There are macros for static initializer for the three out of four possible notifier types, that are: ATOMIC_NOTIFIER_HEAD() BLOCKING_NOTIFIER_HEAD() RAW_NOTIFIER_HEAD() This patch provides a static initilizer for the forth type to make it complete. Signed-off-by: Sebastian Andrzej Siewior Tested-by: Paul E. McKenney Reviewed-by: Paul E. McKenney Signed-off-by: Rafael J. Wysocki

rcutorture: Move SRCU status printing to SRCU implementations

2017-07-24T23:04:08Z

This commit gets rid of some ugly #ifdefs in rcutorture.c by moving the SRCU status printing to the SRCU implementations. Signed-off-by: Paul E. McKenney

srcu: Apply trivial callback lists to shrink Tiny SRCU

2017-06-09T01:52:35Z

The rcu_segcblist structure provides quite a bit of functionality, and Tiny SRCU needs almost none of it. So this commit replaces Tiny SRCU's uses of rcu_segcblist with a simple singly linked list with tail pointer. This change significantly reduces Tiny SRCU's memory footprint, more than making up for the growth caused by the creation of rcu_segcblist.c Signed-off-by: Paul E. McKenney