On Mon, Nov 21, 2022 at 01:26:28PM +1300, Kai Huang wrote:
> +/*
> + * Data structure to make SEAMCALL on multiple CPUs concurrently.
> + * @err is set to -EFAULT when SEAMCALL fails on any cpu.
> + */
> +struct seamcall_ctx {
> + u64 fn;
> + u64 rcx;
> + u64 rdx;
> + u64 r8;
> + u64 r9;
> + atomic_t err;
> +};
> @@ -166,6 +180,25 @@ static int __always_unused seamcall(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
> }
> }
>
> +static void seamcall_smp_call_function(void *data)
> +{
> + struct seamcall_ctx *sc = data;
> + int ret;
> +
> + ret = seamcall(sc->fn, sc->rcx, sc->rdx, sc->r8, sc->r9, NULL, NULL);
> + if (ret)
> + atomic_set(&sc->err, -EFAULT);
> +}
Can someone explain me this usage of atomic_t, please?
