linux-kernel - Re: [PATCH 1/8] drivers/random: Cache align ip

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Message-ID: <1300244054.3128.417.camel@calx>
Date:	Tue, 15 Mar 2011 21:54:14 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	George Spelvin <linux@...izon.com>
Cc:	penberg@...helsinki.fi, herbert@...dor.apana.org.au,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] drivers/random: Cache align ip_random better

On Sun, 2011-03-13 at 20:20 -0400, George Spelvin wrote:
> Cache aligning the secret[] buffer makes copying from it infinitesimally
> more efficient.

Acked-by: Matt Mackall <mpm@...enic.com>

> ---
>  drivers/char/random.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/char/random.c b/drivers/char/random.c
> index 72a4fcb..4bcc4f2 100644
> --- a/drivers/char/random.c
> +++ b/drivers/char/random.c
> @@ -1417,8 +1417,8 @@ static __u32 twothirdsMD4Transform(__u32 const buf[4], __u32 const in[12])
>  #define HASH_MASK ((1 << HASH_BITS) - 1)
>  
>  static struct keydata {
> -	__u32 count; /* already shifted to the final position */
>  	__u32 secret[12];
> +	__u32 count; /* already shifted to the final position */
>  } ____cacheline_aligned ip_keydata[2];
>  
>  static unsigned int ip_cnt;


-- 
Mathematics is the supreme nostalgia of our time.


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