linux-kernel - Re: -mm merge plans for 2.6.21

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Message-ID: <20070210141959.GD7501@slug>
Date:	Sat, 10 Feb 2007 14:19:59 +0000
From:	Frederik Deweerdt <deweerdt@...e.fr>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Subject: Re: -mm merge plans for 2.6.21

On Sat, Feb 10, 2007 at 12:42:41PM +0100, Arnd Bergmann wrote:
> On Friday 09 February 2007 12:24, Arjan van de Ven wrote:
> > 
> > On Fri, 2007-02-09 at 10:57 +0000, Frederik Deweerdt wrote:
> > > +static const int __deprecated SA_INTERRUPT = IRQF_DISABLED;
> > > +static const int __deprecated SA_SAMPLE_RANDOM = IRQF_SAMPLE_RANDOM;
> > > +static const int __deprecated SA_SHIRQ = IRQF_SHARED;
> > > +static const int __deprecated SA_PROBEIRQ = IRQF_PROBE_SHARED;
> > > +static const int __deprecated SA_PERCPU = IRQF_PERCPU;
> > > +
> > > +static const int __deprecated SA_TRIGGER_LOW = IRQF_TRIGGER_LOW;
> > > +static const int __deprecated SA_TRIGGER_HIGH = IRQF_TRIGGER_HIGH;
> > > +static const int __deprecated SA_TRIGGER_FALLING = IRQF_TRIGGER_FALLING;
> > > +static const int __deprecated SA_TRIGGER_RISING = IRQF_TRIGGER_RISING;
> > > +static const int __deprecated SA_TRIGGER_MASK = IRQF_TRIGGER_MASK;
> > 
> > this will include these in every .o file for which the .c file includes
> > the header. NOT GOOD(tm)
> > 
> 
> How about this one instead then:
Well, the warning you get is not that obvious:

test.c: In function 'main':
test.c:11: warning: 'deprecated_irqf' is deprecated

And as far as I could test (gcc 4.1.1 and gcc 3.4.3), Arjan's comment is
not true, the "static const int" don't use extra space, they get
optimized away by the compiler (see http://lkml.org/lkml/2007/2/9/106).

Regards,
Frederik
> 
> Mark SA_* constants as deprecated
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -53,17 +53,19 @@
>   * Migration helpers. Scheduled for removal in 1/2007
>   * Do not use for new code !
>   */
> -#define SA_INTERRUPT		IRQF_DISABLED
> -#define SA_SAMPLE_RANDOM	IRQF_SAMPLE_RANDOM
> -#define SA_SHIRQ		IRQF_SHARED
> -#define SA_PROBEIRQ		IRQF_PROBE_SHARED
> -#define SA_PERCPU		IRQF_PERCPU
> -
> -#define SA_TRIGGER_LOW		IRQF_TRIGGER_LOW
> -#define SA_TRIGGER_HIGH		IRQF_TRIGGER_HIGH
> -#define SA_TRIGGER_FALLING	IRQF_TRIGGER_FALLING
> -#define SA_TRIGGER_RISING	IRQF_TRIGGER_RISING
> -#define SA_TRIGGER_MASK		IRQF_TRIGGER_MASK
> +typedef unsigned int __deprecated deprecated_irqf;
> +
> +#define SA_INTERRUPT		((deprecated_irqf)IRQF_DISABLED)
> +#define SA_SAMPLE_RANDOM	((deprecated_irqf)IRQF_SAMPLE_RANDOM)
> +#define SA_SHIRQ		((deprecated_irqf)IRQF_SHARED)
> +#define SA_PROBEIRQ		((deprecated_irqf)IRQF_PROBE_SHARED)
> +#define SA_PERCPU		((deprecated_irqf)IRQF_PERCPU)
> +
> +#define SA_TRIGGER_LOW		((deprecated_irqf)IRQF_TRIGGER_LOW)
> +#define SA_TRIGGER_HIGH		((deprecated_irqf)IRQF_TRIGGER_HIGH)
> +#define SA_TRIGGER_FALLING	((deprecated_irqf)IRQF_TRIGGER_FALLING)
> +#define SA_TRIGGER_RISING	((deprecated_irqf)IRQF_TRIGGER_RISING)
> +#define SA_TRIGGER_MASK		((deprecated_irqf)IRQF_TRIGGER_MASK)
>  
>  typedef irqreturn_t (*irq_handler_t)(int, void *);
>  
> 
-
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