Re: [patch 04/13] lockdep: Clenaup PREEMPT_COUNT leftovers

[Will Deacon <will@kernel.org>]

On Mon, Sep 14, 2020 at 10:42:13PM +0200, Thomas Gleixner wrote:
> CONFIG_PREEMPT_COUNT is now unconditionally enabled and will be
> removed. Cleanup the leftovers before doing so.
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Will Deacon <will@kernel.org>
> ---
>  include/linux/lockdep.h |    6 ++----
>  lib/Kconfig.debug       |    1 -
>  2 files changed, 2 insertions(+), 5 deletions(-)
> 
> --- a/include/linux/lockdep.h
> +++ b/include/linux/lockdep.h
> @@ -585,16 +585,14 @@ do {									\
>  
>  #define lockdep_assert_preemption_enabled()				\
>  do {									\
> -	WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT)	&&		\
> -		     debug_locks			&&		\
> +	WARN_ON_ONCE(debug_locks			&&		\
>  		     (preempt_count() != 0		||		\
>  		      !raw_cpu_read(hardirqs_enabled)));		\
>  } while (0)
>  
>  #define lockdep_assert_preemption_disabled()				\
>  do {									\
> -	WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT)	&&		\
> -		     debug_locks			&&		\
> +	WARN_ON_ONCE(debug_locks			&&		\
>  		     (preempt_count() == 0		&&		\
>  		      raw_cpu_read(hardirqs_enabled)));			\
>  } while (0)
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1161,7 +1161,6 @@ config PROVE_LOCKING
>  	select DEBUG_RWSEMS
>  	select DEBUG_WW_MUTEX_SLOWPATH
>  	select DEBUG_LOCK_ALLOC
> -	select PREEMPT_COUNT
>  	select TRACE_IRQFLAGS
>  	default n
>  	help

Acked-by: Will Deacon <will@kernel.org>

Will