netdev - Re: [PATCH] [PKT_SCHED] CLS_U32: Use ffs() instead of C code on hash mask to get first set bit.

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Date:	Thu, 08 Nov 2007 08:45:31 -0500
From:	jamal <hadi@...erus.ca>
To:	Radu Rendec <radu.rendec@...s.ro>
Cc:	netdev@...r.kernel.org, jarkao2@...pl, davem@...emloft.net
Subject: Re: [PATCH] [PKT_SCHED] CLS_U32: Use ffs() instead of C code on
	hash mask to get first set bit.

On Thu, 2007-08-11 at 13:07 +0200, Radu Rendec wrote:
> Computing the rank of the first set bit in the hash mask (for using later
> in u32_hash_fold()) was done with plain C code. Using ffs() instead makes
> the code more readable and improves performance (since ffs() is better
> optimized in assembler).
> 
> Using the conditional operator on hash mask before applying ntohl() also
> saves one ntohl() call if mask is 0.
> 
> Signed-off-by: Radu Rendec <radu.rendec@...s.ro>

Acked-by: Jamal Hadi Salim <hadi@...erus.ca>


cheers,
jamal


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