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| author |   Boqun Feng <boqun.feng@gmail.com> | 2020-08-07 15:42:24 +0800 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2020-08-26 12:42:04 +0200 |
| commit | bd76eca10de2eb9998d5125b08e8997cbf5508d5 (patch) | |
| tree | 0e44eb90aba2709830cef110dbaceaaf89acaeb2 /include/linux/lockdep.h | |
| parent | lockdep: Make __bfs() visit every dependency until a match (diff) | |
| download | linux-dev-bd76eca10de2eb9998d5125b08e8997cbf5508d5.tar.xz linux-dev-bd76eca10de2eb9998d5125b08e8997cbf5508d5.zip | |
lockdep: Reduce the size of lock_list::distance
lock_list::distance is always not greater than MAX_LOCK_DEPTH (which
is 48 right now), so a u16 will fit. This patch reduces the size of
lock_list::distance to save space, so that we can introduce other fields
to help detect recursive read lock deadlocks without increasing the size
of lock_list structure.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200807074238.1632519-6-boqun.feng@gmail.com
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 7cae5ea00d59..22750102b5fe 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -54,7 +54,7 @@ struct lock_list { struct lock_class *class; struct lock_class *links_to; const struct lock_trace *trace; - int distance; + u16 distance; /* * The parent field is used to implement breadth-first search, and the |