linux-kernel - Re: [PATCH] compiler.h: don't use temporary variable in __compiletime

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Date:	Thu, 08 May 2014 09:54:31 +0300
From:	Luca Coelho <luca@...lho.fi>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Daniel Santos <daniel.santos@...ox.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] compiler.h: don't use temporary variable in
 __compiletime_assert()

On Thu, 2014-05-08 at 08:31 +0200, Johannes Berg wrote:
> From: Johannes Berg <johannes.berg@...el.com>
> 
> Usually, BUG_ON and friends aren't even evaluated in sparse, but
> recently compiletime_assert_atomic_type() was added, and that now
> results in a sparse warning every time it is used.
> 
> The reason turns out to be the temporary variable, after it sparse
> no longer considers the value to be a constant, and results in a
> warning and an error. The error is the more annoying part of this
> as it suppresses any further warnings in the same file, hiding
> other problems.
> 
> Since this is all about compile time and the condition should be
> side-effect free to start with, there's no downside (apart maybe
> from a slight compilation time penalty?) to just duplicating it,
> leaving sparse able to evaluate it at check time, getting rid of
> the warning and error.
> 
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>
> ---

Tested-by: Luciano Coelho <luciano.coelho@...el.com>

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