linux-kernel - Re: [PATCH 2/3] c/r: Add CR

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Message-ID: <20090304140129.35e1ad97@thinkcentre.lan>
Date:	Wed, 4 Mar 2009 14:01:29 -0600
From:	Nathan Lynch <ntl@...ox.com>
To:	Dan Smith <danms@...ibm.com>
Cc:	containers@...ts.osdl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] c/r: Add CR_COPY() macro (v3)

Hi Dan.

Dan Smith <danms@...ibm.com> wrote:
> +#define CR_CPT 1
> +#define CR_RST 2
> +
> +#define CR_COPY(op, a, b)				        \
> +	do {							\
> +		if (op == CR_CPT)				\
> +			a = b;					\
> +		else						\
> +			b = a;					\
> +	} while (0);

Drop the semicolon ^


> +
> +#define CR_COPY_ARRAY(op, a, b, count)				\
> +	do {							\
> +		BUILD_BUG_ON(sizeof(*a) != sizeof(*b));		\
> +		if (op == CR_CPT)				\
> +			memcpy(a, b, count * sizeof(*a));	\
> +		else						\
> +			memcpy(b, a, count * sizeof(*a));	\
> +	} while (0);
> +

You might want to employ __must_be_array() or similar to catch misuse.

Misuse might also be prevented by providing some documentation :)
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