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| author | Paul E. McKenney <[email protected]> | 2017-10-19 21:52:41 +0000 |
|---|---|---|
| committer | Paul E. McKenney <[email protected]> | 2017-12-11 17:17:39 +0000 |
| commit | efd88b02bb9e6b8b73a20ea611e5d07ed6d4af34 (patch) | |
| tree | 0f84096dc8cc757f5c0c8b7c9de51dec0ccd9342 /tools/perf/scripts/python/compaction-times.py | |
| parent | tracing, rcu: Hide trace event rcu_nocb_wake when not used (diff) | |
| download | kernel-efd88b02bb9e6b8b73a20ea611e5d07ed6d4af34.tar.gz kernel-efd88b02bb9e6b8b73a20ea611e5d07ed6d4af34.zip | |
rcu: Add comment giving debug strategy for double call_rcu()
The following statement has for some reason proven non-intuitive:
WARN_ON_ONCE(rcu_segcblist_empty(&rdp->cblist) != (count == 0));
This commit therefore adds a comment that states that this warning
usually triggers in response to a double call_rcu(), which is sort
of like a double free. The comment also suggests building with
CONFIG_DEBUG_OBJECTS_RCU_HEAD=y to track down the double call_rcu().
Reported-by: David Howells <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/compaction-times.py')
0 files changed, 0 insertions, 0 deletions