Re: [PATCH net/tipc] Replace rcu_swap_protected() with rcu_replace_pointer()

[Ying Xue]

On 12/10/19 11:31 AM, Paul E. McKenney wrote:
> This commit replaces the use of rcu_swap_protected() with the more
> intuitively appealing rcu_replace_pointer() as a step towards removing
> rcu_swap_protected().
> 
> Link: https://lore.kernel.org/lkml/CAHk-=wiAsJLw1egFEE=Z7-GGtM6wcvtyytXZA1+BHqta4gg6Hw@xxxxxxxxxxxxxx/
> Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Reported-by: kbuild test robot <lkp@xxxxxxxxx>
> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
> Cc: Jon Maloy <jon.maloy@xxxxxxxxxxxx>
> Cc: Ying Xue <ying.xue@xxxxxxxxxxxxx>
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Cc: <netdev@xxxxxxxxxxxxxxx>
> Cc: <tipc-discussion@xxxxxxxxxxxxxxxxxxxxx>
> 
> diff --git a/net/tipc/crypto.c b/net/tipc/crypto.c
> index 990a872..64cf831 100644
> --- a/net/tipc/crypto.c
> +++ b/net/tipc/crypto.c
> @@ -258,7 +258,7 @@ static char *tipc_key_change_dump(struct tipc_key old, struct tipc_key new,
>  	rcu_dereference_protected((rcu_ptr), lockdep_is_held(lock))
>  
>  #define tipc_aead_rcu_swap(rcu_ptr, ptr, lock)				\
> -	rcu_swap_protected((rcu_ptr), (ptr), lockdep_is_held(lock))
> +	rcu_replace_pointer((rcu_ptr), (ptr), lockdep_is_held(lock))

(ptr) = rcu_replace_pointer((rcu_ptr), (ptr), lockdep_is_held(lock))

>  
>  #define tipc_aead_rcu_replace(rcu_ptr, ptr, lock)			\
>  do {									\
> @@ -1189,7 +1189,7 @@ static bool tipc_crypto_key_try_align(struct tipc_crypto *rx, u8 new_pending)
>  
>  	/* Move passive key if any */
>  	if (key.passive) {
> -		tipc_aead_rcu_swap(rx->aead[key.passive], tmp2, &rx->lock);
> +		tmp2 = rcu_replace_pointer(rx->aead[key.passive], tmp2, &rx->lock);

tipc_aead_rcu_swap() is only called here in TIPC module. If we use
rcu_replace_pointer() to switch pointers instead of calling
tipc_aead_rcu_swap() macro, I think we should completely remove
tipc_aead_rcu_swap().

>  		x = (key.passive - key.pending + new_pending) % KEY_MAX;
>  		new_passive = (x <= 0) ? x + KEY_MAX : x;
>  	}
>