* guangrong.xiao@xxxxxxxxx (guangrong.xiao@xxxxxxxxx) wrote:
> From: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxx>
>
> It will be used by threaded workqueue
>
> Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxx>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
> ---
> include/qemu/bitops.h | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
> index 3f0926cf40..c522958852 100644
> --- a/include/qemu/bitops.h
> +++ b/include/qemu/bitops.h
> @@ -79,6 +79,19 @@ static inline void change_bit(long nr, unsigned long *addr)
> *p ^= mask;
> }
>
> +/**
> + * change_bit_atomic - Toggle a bit in memory atomically
> + * @nr: Bit to change
> + * @addr: Address to start counting from
> + */
> +static inline void change_bit_atomic(long nr, unsigned long *addr)
> +{
> + unsigned long mask = BIT_MASK(nr);
> + unsigned long *p = addr + BIT_WORD(nr);
> +
> + atomic_xor(p, mask);
> +}
> +
> /**
> * test_and_set_bit - Set a bit and return its old value
> * @nr: Bit to set
> --
> 2.14.5
>
--
Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK
