linux-kernel - Re: [PATCH 2/2] target: use RCU_INIT

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Message-ID: <20160502175950.GA16580@infradead.org>
Date:	Mon, 2 May 2016 10:59:50 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Muhammad Falak R Wani <falakreyaz@...il.com>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	target-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] target: use RCU_INIT_POINTER() when NULLing.

On Mon, May 02, 2016 at 10:57:38AM -0700, Paul E. McKenney wrote:
> -#define rcu_assign_pointer(p, v) smp_store_release(&p, RCU_INITIALIZER(v))
> +#define rcu_assign_pointer(p, v) \
> +({ \
> +	uintptr_t _r_a_p__v = (uintptr_t)(v); \
> +	\
> +	if (__builtin_constant_p(v) && (_r_a_p__v) == (uintptr_t)NULL) \
> +		WRITE_ONCE((p), (typeof(p))(_r_a_p__v)); \
> +	else \
> +		smp_store_release(&p, RCU_INITIALIZER((typeof(p))_r_a_p__v)); \
> +	_r_a_p__v; \
> +})

Can't we turn it into an inline (would need different calling
conventions for p, though).