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| author | Joel Fernandes (Google) <joel@joelfernandes.org> | 2020-11-18 11:15:41 -0500 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-01-06 16:24:19 -0800 |
| commit | b4e6039e8af8c20dfbbdfcaebfcbd7c9d9ffe713 (patch) | |
| tree | a739b9f1aef750d312a7b0002a8db189c197477e /kernel/rcu/rcu_segcblist.c | |
| parent | 3afe7fa535491ecd0382c3968dc2349602bff8a2 (diff) | |
| download | linux-b4e6039e8af8c20dfbbdfcaebfcbd7c9d9ffe713.tar.gz | |
rcu/segcblist: Add debug checks for segment lengths
This commit adds debug checks near the end of rcu_do_batch() that emit
warnings if an empty rcu_segcblist structure has non-zero segment counts,
or, conversely, if a non-empty structure has all-zero segment counts.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
[ paulmck: Fix queue/segment-length checks. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/rcu_segcblist.c')
| -rw-r--r-- | kernel/rcu/rcu_segcblist.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/rcu/rcu_segcblist.c b/kernel/rcu/rcu_segcblist.c index 1e80a0a9036a..89e0dff890bf 100644 --- a/kernel/rcu/rcu_segcblist.c +++ b/kernel/rcu/rcu_segcblist.c @@ -94,6 +94,18 @@ static long rcu_segcblist_get_seglen(struct rcu_segcblist *rsclp, int seg) return READ_ONCE(rsclp->seglen[seg]); } +/* Return number of callbacks in segmented callback list by summing seglen. */ +long rcu_segcblist_n_segment_cbs(struct rcu_segcblist *rsclp) +{ + long len = 0; + int i; + + for (i = RCU_DONE_TAIL; i < RCU_CBLIST_NSEGS; i++) + len += rcu_segcblist_get_seglen(rsclp, i); + + return len; +} + /* Set the length of a segment of the rcu_segcblist structure. */ static void rcu_segcblist_set_seglen(struct rcu_segcblist *rsclp, int seg, long v) { |