On Wed, Jul 08, 2020 at 02:29:38PM +0200, Peter Zijlstra wrote:
> #define SEQCOUNT_LOCKTYPE(name, locktype, preempt, lockmember)
> \
> typedef struct seqcount_##name { \
> seqcount_t seqcount; \
> __SEQCOUNT_LOCKDEP(locktype *lock); \
> } seqcount_##name##_t;
> \
> \
> static __always_inline void \
> seqcount_##name##_init(seqcount_##name##_t *s, locktype *l) \
> { \
> seqcount_init(&s->seqcount); \
> __SEQCOUNT_LOCKDEP(s->lock = l); \
> } \
> \
> static __always_inline __seqprop_ptr_t
> \
> __seqprop_##name##_ptr(seqcount_##name##_t *s)
> \
> { \
> return &s->seqcount; \
> } \
> \
> static __always_inline __seqprop_preempt_t \
> __seqprop_##name##_preempt(seqcount_##name##_t *s) \
> { \
> return preempt; \
> } \
> \
> static __always_inline __seqprop_assert_t \
> __seqprop_##name##_assert(seqcount_##name##_t *s) \
> { \
> __SEQCOUNT_LOCKDEP(lockdep_assert_held(s->lockmember)); \
> }
For PREEMPT_RT's magic thing, you can add:
static __always_inline void \
__seqprop_##name##_lock(seqcount_##name##_t *s) \
{ \
if (!__SEQ_RT || !preempt) \
return; \
\
lockbase##_lock(&s->lock); \
lockbase##_unlock(&s->lock); \
}
and:
#define __rt_lock_unlock_associated_sleeping_lock(s) __seqprop(s, lock)
