On Tue, 2020-09-15 at 16:30 +0200, peterz@xxxxxxxxxxxxx wrote:
> On Tue, Sep 15, 2020 at 08:48:17PM +0800, Boqun Feng wrote:
> > I think this happened because seqcount_##lockname##_init() is defined at
> > function rather than macro, so when the seqcount_init() gets expand in
>
> Bah! I hate all this :/
>
> I suspect the below, while more verbose than I'd like is the best
> option.
Stephen, can you add this patch for now until Peter beats you to it?
>
> ---
> include/linux/seqlock.h | 22 ++++++++++++++--------
> 1 file changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
> index f73c7eb68f27..76e44e6c0100 100644
> --- a/include/linux/seqlock.h
> +++ b/include/linux/seqlock.h
> @@ -173,6 +173,19 @@ static inline void seqcount_lockdep_reader_access(const
> seqcount_t *s)
> * @lock: Pointer to the associated lock
> */
>
> +#define seqcount_LOCKNAME_init(s, _lock, lockname) \
> + do { \
> + seqcount_##lockname##_t *____s = (s); \
> + seqcount_init(&____s->seqcount); \
> + __SEQ_LOCK(____s->lock = (_lock)); \
> + } while (0)
> +
> +#define seqcount_raw_spinlock_init(s, lock) seqcount_LOCKNAME_init(s, lock,
> raw_spinlock)
> +#define seqcount_spinlock_init(s, lock) seqcount_LOCKNAME_init(s
> , lock, spinlock)
> +#define seqcount_rwlock_init(s, lock) seqcount_LOCKNAME_init(s
> , lock, rwlock);
> +#define seqcount_mutex_init(s, lock) seqcount_LOCKNAME_init(s, lock,
> mutex);
> +#define seqcount_ww_mutex_init(s, lock) seqcount_LOCKNAME_init(s
> , lock, ww_mutex);
> +
> /*
> * SEQCOUNT_LOCKNAME() - Instantiate seqcount_LOCKNAME_t and helpers
> * seqprop_LOCKNAME_*() - Property accessors for seqcount_LOCKNAME_t
> @@ -190,13 +203,6 @@ typedef struct seqcount_##lockname {
> \
> __SEQ_LOCK(locktype *lock); \
> } seqcount_##lockname##_t; \
> \
> -static __always_inline void \
> -seqcount_##lockname##_init(seqcount_##lockname##_t *s, locktype *lock)
> \
> -{ \
> - seqcount_init(&s->seqcount); \
> - __SEQ_LOCK(s->lock = lock); \
> -} \
> - \
> static __always_inline seqcount_t * \
> __seqprop_##lockname##_ptr(seqcount_##lockname##_t *s)
> \
> { \
> @@ -284,8 +290,8 @@ SEQCOUNT_LOCKNAME(ww_mutex, struct ww_mutex,
> true, &s->lock->base, ww_mu
> __SEQ_LOCK(.lock = (assoc_lock)) \
> }
>
> -#define SEQCNT_SPINLOCK_ZERO(name, lock) SEQCOUNT_LOCKNAME_ZERO(name,
> lock)
> #define SEQCNT_RAW_SPINLOCK_ZERO(name, lock) SEQCOUNT_LOCKNAME_ZERO(name,
> lock)
> +#define SEQCNT_SPINLOCK_ZERO(name, lock) SEQCOUNT_LOCKNAME_ZERO(name,
> lock)
> #define SEQCNT_RWLOCK_ZERO(name, lock) SEQCOUNT_LOCKNAME_ZERO(n
> ame, lock)
> #define SEQCNT_MUTEX_ZERO(name, lock) SEQCOUNT_LOCKNAME_ZERO(n
> ame, lock)
> #define SEQCNT_WW_MUTEX_ZERO(name, lock) SEQCOUNT_LOCKNAME_ZERO(name,
> lock)
>
