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lockdep: Reduce the size of lock_list::distance

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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
This commit is contained in:
Boqun Feng
2020-08-07 15:42:24 +08:00
committed by Peter Zijlstra
parent d563bc6ead
commit bd76eca10d
2 changed files with 4 additions and 4 deletions
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2
include/linux/lockdep.h
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@@ -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