Some usage sites of bit spinlocks have a substitution with regular spinlocks which depends on CONFIG_PREEMPT_RT. But this substitution can also be used to expose these locks to the regular lock debugging infrastructure, e.g. lockdep. As this increases the size of affected data structures significantly this is guarded by a separate Kconfig switch. Note, that only the bit spinlocks which have a substitution implemented will be covered by this. All other bit spinlocks evade lock debugging as before. Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> --- lib/Kconfig.debug | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1201,6 +1201,16 @@ config DEBUG_RWSEMS This debugging feature allows mismatched rw semaphore locks and unlocks to be detected and reported. +config DEBUG_BIT_SPINLOCKS + bool "Bit spinlock debugging" + depends on DEBUG_SPINLOCK + help + This debugging feature substitutes bit spinlocks in some use + cases, e.g. buffer head, zram, with with regular spinlocks so + these locks are exposed to lock debugging features. + + Not all bit spinlocks are covered by this. + config DEBUG_LOCK_ALLOC bool "Lock debugging: detect incorrect freeing of live locks" depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
