Re: [Xen-devel] [PATCH for-4.5 v6 17/17] tools/tests: Enable xen-access on ARM

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Mon, 2014-09-15 at 16:02 +0200, Tamas K Lengyel wrote:
> +static inline int test_and_set_bit(int nr, volatile void *addr)
> +{
> +        unsigned int mask = BIT_MASK(nr);
> +        volatile unsigned int *p =
> +                ((volatile unsigned int *)addr) + BIT_WORD(nr);
> +        unsigned int old = *p;
> +
> +        *p = old | mask;
> +        return (old & mask) != 0;
> +}

This doesn't need to be / is not intended to be atomic, right?




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