linux-kernel - Re: [PATCH] staging/rdma/hfi1: use RCU_INIT

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Date:	Mon, 2 May 2016 08:27:55 +0300
From:	Leon Romanovsky <leon@...nel.org>
To:	Muhammad Falak R Wani <falakreyaz@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Mike Marciniszyn <infinipath@...el.com>,
	Doug Ledford <dledford@...hat.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	linux-rdma@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH] staging/rdma/hfi1: use RCU_INIT_POINTER() when NULLing.

On Sun, May 01, 2016 at 06:05:31PM +0530, Muhammad Falak R Wani wrote:
> It is safe to use RCU_INIT_POINTER() to NULL a pointer, instead of
> rcu_assign_pointer().
> This results in slightly smaller/faster code.
> 
> Signed-off-by: Muhammad Falak R Wani <falakreyaz@...il.com>

I'm fine with your commit message and don't need to resend, however
the statements like "smaller code" need to be supported by
./scripts/bloat-o-meter and "faster code" by performance analysis.

Reviewed-by: Leon Romanovsky <leonro@...lanox.com>

> ---
>  drivers/staging/rdma/hfi1/init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rdma/hfi1/init.c b/drivers/staging/rdma/hfi1/init.c
> index cfcdc16..34e0f90 100644
> --- a/drivers/staging/rdma/hfi1/init.c
> +++ b/drivers/staging/rdma/hfi1/init.c
> @@ -1303,7 +1303,7 @@ static void cleanup_device_data(struct hfi1_devdata *dd)
>  
>  		spin_lock(&ppd->cc_state_lock);
>  		cc_state = get_cc_state(ppd);
> -		rcu_assign_pointer(ppd->cc_state, NULL);
> +		RCU_INIT_POINTER(ppd->cc_state, NULL);
>  		spin_unlock(&ppd->cc_state_lock);
>  
>  		if (cc_state)
> -- 
> 1.9.1
> 
> --
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