linux-kernel - Re: [RFC local_t removal V1 1/4] Add add_local() and add_local

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Date:	Tue, 5 Jan 2010 17:17:28 -0500
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC local_t removal V1 1/4] Add add_local() and 
	add_local_return()

On Tue, Jan 5, 2010 at 17:04, Christoph Lameter wrote:
> --- /dev/null   1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/include/asm-generic/add-local.h   2010-01-05 15:36:02.000000000 -0600
> @@ -0,0 +1,13 @@
> +#ifndef __ASM_GENERIC_ADD_LOCAL_H
> +#define __ASM_GENERIC_ADD_LOCAL_H

needs comment header (blurb/copyright/license)

> +#define add_return_local(ptr, v)                                       \
> +       ((__typeof__(*(ptr)))__add_return_local_generic((ptr),          \
> +                       (unsigned long)(v), sizeof(*(ptr))))
> +
> +#define add_local(ptr, v) (void)__add_return_local_generic((ptr),      \
> +                       (unsigned long)(v), sizeof(*(ptr)))

the only difference here is the cast ... perhaps define an
_add_local() macro to avoid the duplication

> --- /dev/null   1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/arch/alpha/include/asm/add-local.h        2010-01-05 15:36:02.000000000 -0600
> @@ -0,0 +1,2 @@
> +#include <asm-generic/add-local.h>
> +

these arch stubs all have an extra new line

> --- /dev/null   1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/include/asm-generic/add-local-generic.h   2010-01-05 15:36:02.000000000 -0600
> @@ -0,0 +1,40 @@
> +#ifndef __ASM_GENERIC_ADD_LOCAL_GENERIC_H
> +#define __ASM_GENERIC_ADD_LOCAL_GENERIC_H

needs comment header (blurb/copyright/license)

> +/*
> + * Generic version of __add_return_local (disables interrupts). Takes an
> + * unsigned long parameter, supporting various types of architectures.
> + */
> +static inline unsigned long __add_return_local_generic(volatile void *ptr,
> +               unsigned long value, int size)

size_t for size ?


> +extern unsigned long wrong_size_add_local(volatile void *ptr);
> ...
> +       /*
> +        * Sanity checking, compile-time.
> +        */
> +       if (size == 8 && sizeof(unsigned long) != 8)
> +               wrong_size_add_local(ptr);
> ...
> +       default:
> +               wrong_size_add_local(ptr);
> +       }

should be BUILD_BUG_ON() ?
-mike
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