On Fri, 21 Feb 2020 14:34:17 +0100
Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> --- a/kernel/locking/lockdep.c
> +++ b/kernel/locking/lockdep.c
> @@ -379,13 +379,13 @@ void lockdep_init_task(struct task_struc
>
> void lockdep_off(void)
> {
> - current->lockdep_recursion++;
> + current->lockdep_recursion += BIT(16);
> }
> EXPORT_SYMBOL(lockdep_off);
>
> void lockdep_on(void)
> {
> - current->lockdep_recursion--;
> + current->lockdep_recursion -= BIT(16);
> }
> EXPORT_SYMBOL(lockdep_on);
>
> +
> +static bool lockdep_nmi(void)
> +{
> + if (current->lockdep_recursion & 0xFFFF)
Nitpick, but the association with bit 16 and this mask really should be
defined as a macro somewhere and not have hard coded numbers.
-- Steve
> + return false;
> +
> + if (!in_nmi())
> + return false;
> +
> + return true;
> +}
> +
