linux-kernel - Re: [PATCH] rcu: move some code from macro to function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20100328041554.GQ2343@linux.vnet.ibm.com>
Date:	Sat, 27 Mar 2010 21:15:54 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rcu: move some code from macro to function

On Sun, Mar 28, 2010 at 11:12:30AM +0800, Lai Jiangshan wrote:
> 
> cleanup: move some code from macro to function

Nice!

I have queued this for RCU 2.6.35, with the following commit message:

	Shrink the RCU_INIT_FLAVOR() macro by moving all but the
	initialization of the ->rda[] array to rcu_init_one().
	The call to rcu_init_one() can then be moved to the end
	of the RCU_INIT_FLAVOR() macro, which is required because
	rcu_boot_init_percpu_data(), which is now called from
	rcu_init_one(), depends on the initialization of the ->rda[]
	array.

Seem reasonable?

							Thanx, Paul

> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> ---
> diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> index 3ec8160..112edb5 100644
> --- a/kernel/rcutree.c
> +++ b/kernel/rcutree.c
> @@ -1849,6 +1849,14 @@ static void __init rcu_init_one(struct rcu_state *rsp)
>  			INIT_LIST_HEAD(&rnp->blocked_tasks[3]);
>  		}
>  	}
> +
> +	rnp = rsp->level[NUM_RCU_LVLS - 1];
> +	for_each_possible_cpu(i) {
> +		if (i > rnp->grphi)
> +			rnp++;
> +		rsp->rda[i]->mynode = rnp;
> +		rcu_boot_init_percpu_data(i, rsp);
> +	}
>  }
> 
>  /*
> @@ -1859,19 +1867,11 @@ static void __init rcu_init_one(struct rcu_state *rsp)
>  #define RCU_INIT_FLAVOR(rsp, rcu_data) \
>  do { \
>  	int i; \
> -	int j; \
> -	struct rcu_node *rnp; \
>  	\
> -	rcu_init_one(rsp); \
> -	rnp = (rsp)->level[NUM_RCU_LVLS - 1]; \
> -	j = 0; \
>  	for_each_possible_cpu(i) { \
> -		if (i > rnp[j].grphi) \
> -			j++; \
> -		per_cpu(rcu_data, i).mynode = &rnp[j]; \
>  		(rsp)->rda[i] = &per_cpu(rcu_data, i); \
> -		rcu_boot_init_percpu_data(i, rsp); \
>  	} \
> +	rcu_init_one(rsp); \
>  } while (0)
> 
>  void __init rcu_init(void)
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/