Re: [dpdk-dev] [PATCH 1/7] Fix rte_is_power_of_2

[Neil Horman <nhorman@tuxdriver.com>]

On Thu, Dec 25, 2014 at 10:33:11AM -0500, Ravi Kerur wrote:
> rte_is_power_of_2 returns true for 0 and 0 is not power_of_2. Fix
> by checking for n.
> 
> Signed-off-by: Ravi Kerur <rkerur@gmail.com>
> ---
>  lib/librte_eal/common/include/rte_common.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
> index 921b91f..8ac940c 100644
> --- a/lib/librte_eal/common/include/rte_common.h
> +++ b/lib/librte_eal/common/include/rte_common.h
> @@ -203,7 +203,7 @@ extern int RTE_BUILD_BUG_ON_detected_error;
>  static inline int
>  rte_is_power_of_2(uint32_t n)
>  {
> -	return ((n-1) & n) == 0;
> +	return n && !(n & (n - 1));
>  }
>  
>  /**
> -- 
> 1.9.1
> 
> 

This is the third time you've tried to slip this change in with some larger
changeset.  I'm in favor of it, but please, stop trying to bury stuff in other,
larger changesets.  Its a legitimate bug, you can just post this on its own.

Neil