Re: [PATCH] x86, kasan: add KASAN checks to atomic operations

[Peter Zijlstra]

On Tue, Mar 14, 2017 at 04:22:52PM +0100, Dmitry Vyukov wrote:
> Any other suggestions?

> -	return i + xadd(&v->counter, i);
> +	return i + arch_xadd(&v->counter, i);

> +#define xadd(ptr, v)					\
> +({							\
> +	__typeof__(ptr) ____ptr = (ptr);		\
> +	kasan_check_write(____ptr, sizeof(*____ptr));	\
> +	arch_xadd(____ptr, (v));			\
> +})

xadd() isn't a generic thing, it only exists inside x86 as a helper to
implement atomic bits.