From: David Howells <dhowells@redhat.com>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: dhowells@redhat.com, linux-kernel@vger.kernel.org,
grant@secretlab.ca, ralf@linux-mips.org
Subject: Re: [PATCH] FRV: Hook up gpiolib support
Date: Fri, 17 Jun 2011 11:50:59 +0100 [thread overview]
Message-ID: <28714.1308307859@redhat.com> (raw)
In-Reply-To: <20110616102209.GC5262@opensource.wolfsonmicro.com>
Mark Brown <broonie@opensource.wolfsonmicro.com> wrote:
> And to repeat what I said: the generic header prototypes everything it
> needs before it uses it so there should be no problem here, it's not
> been a problem on the other architectures using this code verbatim.
> Please be more specific.
Okay:
CC drivers/mtd/maps/gpio-addr-flash.o
In file included from /data/frv/linux-2.6-frv/arch/frv/include/asm/gpio.h:21,
from include/linux/gpio.h:8,
from drivers/mtd/maps/gpio-addr-flash.c:17:
include/asm-generic/gpio.h: In function 'gpio_get_value_cansleep':
include/asm-generic/gpio.h:233: error: implicit declaration of function 'gpio_get_value'
include/asm-generic/gpio.h: In function 'gpio_set_value_cansleep':
include/asm-generic/gpio.h:239: error: implicit declaration of function 'gpio_set_value'
drivers/mtd/maps/gpio-addr-flash.c: In function 'gpio_flash_probe':
drivers/mtd/maps/gpio-addr-flash.c:234: error: implicit declaration of function 'gpio_request'
drivers/mtd/maps/gpio-addr-flash.c:238: error: implicit declaration of function 'gpio_free'
drivers/mtd/maps/gpio-addr-flash.c:242: error: implicit declaration of function 'gpio_direction_output'
Let me expand on my explanation earlier:
(1) asm-generic/gpio.h has an _inline_ function:
static inline int gpio_get_value_cansleep(unsigned gpio)
{
might_sleep();
return gpio_get_value(gpio);
}
(2) gpio_get_value() is implemented in asm/gpio.h. It is not declared in
asm-generic/gpio.h.
(3) Therefore, the #inclusion of asm-generic/gpio.h must come _after_ the
implementation of gpio_get_value() in asm/gpio.h.
(4) asm/gpio.h implements the aforementioned inline function:
static inline int gpio_get_value(unsigned int gpio)
{
return __gpio_get_value(gpio);
}
(5) __gpio_get_value() is declared in asm-generic/gpio.h. It is not declared
in asm/gpio.h.
(6) Therefore, the #inclusion of asm/gpio.h must come _before_ the
implementation of gpio_get_value() in asm/gpio.h.
Thus (3) and (6) contradict.
David
next prev parent reply other threads:[~2011-06-17 10:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-01 9:49 [PATCH] FRV: Hook up gpiolib support Mark Brown
2011-06-01 20:19 ` Grant Likely
2011-06-14 18:08 ` David Howells
2011-06-15 14:48 ` Mark Brown
2011-06-16 6:36 ` David Howells
2011-06-16 10:22 ` Mark Brown
2011-06-17 10:50 ` David Howells [this message]
2011-06-17 10:54 ` Felipe Balbi
2011-06-17 12:18 ` Mark Brown
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