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Subject[PATCH] lockdep: Allow tuning tracing keys constant.
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Tetsuo Handa made a change for tuning lockdep tracing capacity constants
[1]. He created following tracing config constants:
- LOCKDEP_BITS
- LOCKDEP_CHAINS_BITS
- LOCKDEP_STACK_TRACE_BITS
However there is a missing one for LOCKDEP_KEYS_BITS. We can see this is
also hitting the upper limits in [2].

[1] https://github.com/torvalds/linux/commit/5dc33592e95534dc8455ce3e9baaaf3dae0fff82
[2] https://syzkaller.appspot.com/bug?id=df466e1151a7e45dd880d8c7033f1ad48acebfb4

Fixes: 5dc33592e955 ("lockdep: Allow tuning tracing capacity constants.")
Signed-off-by: Ryan Huang <tzukui@google.com>
---
include/linux/lockdep.h | 2 +-
lib/Kconfig.debug | 8 ++++++++
2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 1f1099dac3f05..3bb1740296559 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -82,7 +82,7 @@ struct lock_chain {
u64 chain_key;
};

-#define MAX_LOCKDEP_KEYS_BITS 13
+#define MAX_LOCKDEP_KEYS_BITS CONFIG_LOCKDEP_KEYS_BITS
#define MAX_LOCKDEP_KEYS (1UL << MAX_LOCKDEP_KEYS_BITS)
#define INITIAL_CHAIN_KEY -1

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d3e5f36bb01e0..d15024bd14f1d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1398,6 +1398,14 @@ config LOCKDEP_CHAINS_BITS
help
Try increasing this value if you hit "BUG: MAX_LOCKDEP_CHAINS too low!" message.

+config LOCKDEP_KEYS_BITS
+ int "Bitsize for MAX_LOCKDEP_KEYS"
+ depends on LOCKDEP && !LOCKDEP_SMALL
+ range 10 30
+ default 13
+ help
+ Try increasing this value if you hit "BUG: MAX_LOCKDEP_KEYS too low!" message.
+
config LOCKDEP_STACK_TRACE_BITS
int "Bitsize for MAX_STACK_TRACE_ENTRIES"
depends on LOCKDEP && !LOCKDEP_SMALL
--
2.38.0.rc1.362.ged0d419d3c-goog
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