linux-kernel - Re: [PATCH 1/9] kernel: Provide READ_ONCE and ASSIGN

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Message-ID: <20141205021217.5337.qmail@ns.horizon.com>
Date:	4 Dec 2014 21:12:17 -0500
From:	"George Spelvin" <linux@...izon.com>
To:	borntraeger@...ibm.com
Cc:	linux@...izon.com, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 1/9] kernel: Provide READ_ONCE and ASSIGN_ONCE

> +#define READ_ONCE(p) \
> +	 typeof(p) __val; __read_once_size(&p, &__val, sizeof(__val)); __val; })
> +
> +#define ASSIGN_ONCE(val, p) \
> +	({ typeof(p) __val; __val = val; __assign_once_size(&p, &__val, sizeof(__val)); __val; })

Minor style nit: is it necessary to name a non-pointer variable "p"?
I expect typeof(p) to be a pointer type.

(The other fun style question, which is a lot less minor, is whether
ASSIGN_ONCE should be (src,dst) as above, or (dst,src) like = and
<string.h>.)
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