On 28.07.21 14:47, Renaud Barbier wrote:
> In preparation for the introduction of the FSL IFC nand driver
> for the layerscape CPU, add 64-bit counter support.
>
> Signed-off-by: Renaud Barbier <renaud.barbier@xxxxxxxxx>
> ---
> include/asm-generic/atomic-long.h | 3 +-
> include/asm-generic/atomic.h | 49 +++++++++++++++++++++++++++++++
> 2 files changed, 51 insertions(+), 1 deletion(-)
>
> diff --git a/include/asm-generic/atomic-long.h b/include/asm-generic/atomic-long.h
> index 322d510f38..dbb503e758 100644
> --- a/include/asm-generic/atomic-long.h
> +++ b/include/asm-generic/atomic-long.h
> @@ -65,7 +65,7 @@ static inline void atomic_long_sub(long i, atomic_long_t *l)
>
> atomic64_sub(i, v);
> }
> -
> +#if 0
> static inline int atomic_long_sub_and_test(long i, atomic_long_t *l)
> {
> atomic64_t *v = (atomic64_t *)l;
> @@ -128,6 +128,7 @@ static inline long atomic_long_add_unless(atomic_long_t *l, long a, long u)
>
> return (long)atomic64_add_unless(v, a, u);
> }
> +#endif
Why comment these out?
>
> #define atomic_long_inc_not_zero(l) atomic64_inc_not_zero((atomic64_t *)(l))
>
> diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
> index 449cecaabc..6e63b8e8e7 100644
> --- a/include/asm-generic/atomic.h
> +++ b/include/asm-generic/atomic.h
> @@ -11,7 +11,55 @@
> #ifdef CONFIG_SMP
> #error SMP not supported
> #endif
> +#define ATOMIC_INIT(i) { (i) }
> +
> +#ifdef CONFIG_64BIT
> +typedef struct { s64 counter; } atomic64_t;
> +
> +#define atomic64_read(v) ((v)->counter)
> +#define atomic64_set(v, i) (((v)->counter) = (i))
> +
> +static inline void atomic64_add(s64 i, volatile atomic64_t *v)
> +{
> + v->counter += i;
> +}
> +
> +static inline void atomic64_sub(s64 i, volatile atomic64_t *v)
> +{
> + v->counter -= i;
> +}
> +
> +static inline void atomic64_inc(volatile atomic64_t *v)
> +{
> + v->counter += 1;
> +}
> +
> +static inline void atomic64_dec(volatile atomic64_t *v)
> +{
> + v->counter -= 1;
> +}
> +
> +static inline int atomic64_dec_and_test(volatile atomic64_t *v)
> +{
> + s64 val;
> +
> + val = v->counter;
> + v->counter = val -= 1;
> +
> + return val == 0;
> +}
>
> +static inline int atomic64_add_negative(s64 i, volatile atomic64_t *v)
> +{
> + s64 val;
> +
> + val = v->counter;
> + v->counter = val += i;
> +
> + return val < 0;
> +}
> +
> +#else
> typedef struct { volatile int counter; } atomic_t;
>
> #define ATOMIC_INIT(i) { (i) }
> @@ -63,6 +111,7 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
> {
> *addr &= ~mask;
> }
> +#endif
>
> /* Atomic operations are already serializing on ARM */
> #define smp_mb__before_atomic_dec() barrier()
>
--
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