linux-kernel - Re: [PATCH 4/11] use ether_addr_equal

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Message-ID: <alpine.DEB.2.10.1401061001340.2079@hadrien>
Date:	Mon, 6 Jan 2014 10:04:28 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Joe Perches <joe@...ches.com>
cc:	Julia Lawall <julia.lawall@...6.fr>,
	Johannes Berg <johannes@...solutions.net>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	kernel-janitors@...r.kernel.org,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/11]  use ether_addr_equal_64bits

On Mon, 6 Jan 2014, Joe Perches wrote:

> On Mon, 2014-01-06 at 09:48 +0100, Julia Lawall wrote:
> > Is there any way to get sizeof evaluated at build time?
>
> I'm confused a bit by what you want to accomplish.

To check that a field that is an argument od ether_addr_equal_64bits is
a sufficient distance from the end of the structure.

> Except for variable length arrays, isn't sizeof always
> evaluated at build time?

OK, the question was expressed badly.  Is there any way to use the value
to trigger an action at build time?  The only way I kow to trigger an
action is with #error, but #error is processed by cpp, which doesn't know
about the size of types.

julia

> 6.5.3.4 The sizeof operator
> Constraints
> []
> 2 The sizeof operator yields the size (in bytes) of its operand, which may be an
> expression or the parenthesized name of a type. The size is determined from the type of
> the operand. The result is an integer. If the type of the operand is a variable length array
> type, the operand is evaluated; otherwise, the operand is not evaluated and the result is an
> integer constant.
>
>
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