On Wed, Apr 05, 2023 at 04:17:07PM +0200, Uros Bizjak wrote:
> Implement generic support for local{,64}_try_cmpxchg.
>
> Redirect to the atomic_ family of functions when the target
> does not provide its own local.h definitions.
>
> For 64-bit targets, implement local64_try_cmpxchg and
> local64_cmpxchg using typed C wrappers that call local_
> family of functions and provide additional checking
> of their input arguments.
>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Acked-by: Mark Rutland <mark.rutland@xxxxxxx>
Mark.
> ---
> include/asm-generic/local.h | 1 +
> include/asm-generic/local64.h | 12 +++++++++++-
> 2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/include/asm-generic/local.h b/include/asm-generic/local.h
> index fca7f1d84818..7f97018df66f 100644
> --- a/include/asm-generic/local.h
> +++ b/include/asm-generic/local.h
> @@ -42,6 +42,7 @@ typedef struct
> #define local_inc_return(l) atomic_long_inc_return(&(l)->a)
>
> #define local_cmpxchg(l, o, n) atomic_long_cmpxchg((&(l)->a), (o), (n))
> +#define local_try_cmpxchg(l, po, n) atomic_long_try_cmpxchg((&(l)->a), (po), (n))
> #define local_xchg(l, n) atomic_long_xchg((&(l)->a), (n))
> #define local_add_unless(l, _a, u) atomic_long_add_unless((&(l)->a), (_a), (u))
> #define local_inc_not_zero(l) atomic_long_inc_not_zero(&(l)->a)
> diff --git a/include/asm-generic/local64.h b/include/asm-generic/local64.h
> index 765be0b7d883..14963a7a6253 100644
> --- a/include/asm-generic/local64.h
> +++ b/include/asm-generic/local64.h
> @@ -42,7 +42,16 @@ typedef struct {
> #define local64_sub_return(i, l) local_sub_return((i), (&(l)->a))
> #define local64_inc_return(l) local_inc_return(&(l)->a)
>
> -#define local64_cmpxchg(l, o, n) local_cmpxchg((&(l)->a), (o), (n))
> +static inline s64 local64_cmpxchg(local64_t *l, s64 old, s64 new)
> +{
> + return local_cmpxchg(&l->a, old, new);
> +}
> +
> +static inline bool local64_try_cmpxchg(local64_t *l, s64 *old, s64 new)
> +{
> + return local_try_cmpxchg(&l->a, (long *)old, new);
> +}
> +
> #define local64_xchg(l, n) local_xchg((&(l)->a), (n))
> #define local64_add_unless(l, _a, u) local_add_unless((&(l)->a), (_a), (u))
> #define local64_inc_not_zero(l) local_inc_not_zero(&(l)->a)
> @@ -81,6 +90,7 @@ typedef struct {
> #define local64_inc_return(l) atomic64_inc_return(&(l)->a)
>
> #define local64_cmpxchg(l, o, n) atomic64_cmpxchg((&(l)->a), (o), (n))
> +#define local64_try_cmpxchg(l, po, n) atomic64_try_cmpxchg((&(l)->a), (po), (n))
> #define local64_xchg(l, n) atomic64_xchg((&(l)->a), (n))
> #define local64_add_unless(l, _a, u) atomic64_add_unless((&(l)->a), (_a), (u))
> #define local64_inc_not_zero(l) atomic64_inc_not_zero(&(l)->a)
> --
> 2.39.2
>
