On 12.05.2017 12:20, David Hildenbrand wrote:
> Let's provide a basic lock implementation that should work on most
> architectures.
>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
> ---
> lib/asm-generic/spinlock.h | 16 +++++++++++++++-
> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/lib/asm-generic/spinlock.h b/lib/asm-generic/spinlock.h
> index 3141744..e8c3a58 100644
> --- a/lib/asm-generic/spinlock.h
> +++ b/lib/asm-generic/spinlock.h
> @@ -1,4 +1,18 @@
> #ifndef _ASM_GENERIC_SPINLOCK_H_
> #define _ASM_GENERIC_SPINLOCK_H_
> -#error need architecture specific asm/spinlock.h
> +
> +struct spinlock {
> + unsigned int v;
> +};
> +
> +static inline void spin_lock(struct spinlock *lock)
> +{
> + while (!__sync_bool_compare_and_swap(&lock->v, 0, 1));
> +}
> +
> +static inline void spin_unlock(struct spinlock *lock)
> +{
> + __sync_bool_compare_and_swap(&lock->v, 1, 0);
> +}
> +
> #endif
>
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>
