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| author |   Carlos Llamas <cmllamas@google.com> | 2024-10-24 18:36:28 +0000 |
|---|---|---|
| committer |   Boqun Feng <boqun.feng@gmail.com> | 2024-12-15 11:49:35 -0800 |
| commit | bd7b5ae26618ad2bd6f6264e2cb6c5815d323e75 (patch) | |
| tree | 7ce772fbdd440022e855925ead3eba5b837c002b | |
| parent | lockdep: Clarify size for LOCKDEP_*_BITS configs (diff) | |
| download | wireguard-linux-bd7b5ae26618ad2bd6f6264e2cb6c5815d323e75.tar.xz wireguard-linux-bd7b5ae26618ad2bd6f6264e2cb6c5815d323e75.zip | |
lockdep: Document MAX_LOCKDEP_CHAIN_HLOCKS calculation
Define a macro AVG_LOCKDEP_CHAIN_DEPTH to document the magic number '5'
used in the calculation of MAX_LOCKDEP_CHAIN_HLOCKS. The number
represents the estimated average depth (number of locks held) of a lock
chain. The calculation of MAX_LOCKDEP_CHAIN_HLOCKS was first added in
commit 443cd507ce7f ("lockdep: add lock_class information to lock_chain
and output it").
Suggested-by: Waiman Long <longman@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: J. R. Okajima <hooanon05g@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Acked-by: "Huang, Ying" <ying.huang@intel.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/20241024183631.643450-4-cmllamas@google.com
| -rw-r--r-- | kernel/locking/lockdep_internals.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h index bbe9000260d0..20f9ef58d3d0 100644 --- a/kernel/locking/lockdep_internals.h +++ b/kernel/locking/lockdep_internals.h @@ -119,7 +119,8 @@ static const unsigned long LOCKF_USED_IN_IRQ_READ = #define MAX_LOCKDEP_CHAINS (1UL << MAX_LOCKDEP_CHAINS_BITS) -#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5) +#define AVG_LOCKDEP_CHAIN_DEPTH 5 +#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS * AVG_LOCKDEP_CHAIN_DEPTH) extern struct lock_chain lock_chains[]; |