Re: [PATCH] gpiolib: Add 'struct gpio_chip' forward declaration for !GPIOLIB case
From: Grant Likely <hidden>
Date: 2010-08-31 08:03:59
Also in:
lkml
On Tue, Aug 24, 2010 at 01:26:23PM +0400, Anton Vorontsov wrote:
With CONFIG_GPIOLIB=n, the 'struct gpio_chip' is not declared,
so the following pops up on PowerPC:
cc1: warnings being treated as errors
In file included from arch/powerpc/platforms/52xx/mpc52xx_common.c:19:
include/linux/of_gpio.h:74: warning: 'struct gpio_chip' declared
inside parameter list
include/linux/of_gpio.h:74: warning: its scope is only this definition
or declaration, which is probably not what
you want
include/linux/of_gpio.h:75: warning: 'struct gpio_chip' declared
inside parameter list
make[2]: *** [arch/powerpc/platforms/52xx/mpc52xx_common.o] Error 1
This patch fixes the issue by providing the proper forward declaration.
Signed-off-by: Anton Vorontsov <redacted>This doesn't actually solve the problem, and gpiochip should remain undefined when CONFIG_GPIOLIB=n to catch exactly these build failures. The real problem is that I merged a change into the mpc5200 code that required CONFIG_GPIOLIB be enabled without reflecting that requirement in Kconfig. g.
quoted hunk ↗ jump to hunk
--- On Tue, Aug 24, 2010 at 04:26:08PM +1000, Benjamin Herrenschmidt wrote:quoted
I get that with my current stuff: cc1: warnings being treated as errors In file included from [..]/mpc52xx_common.c:19: of_gpio.h:74: error: ‘struct gpio_chip’ declared inside parameter list[...]quoted
make[3]: *** Waiting for unfinished jobs....That's because with GPIOCHIP=n no one declares struct gpio_chip. It should be either of_gpio.h or gpio.h. Let's make it gpio.h, as this feels more generic, and we already have some !GPIOLIB handling in there. include/linux/gpio.h | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)diff --git a/include/linux/gpio.h b/include/linux/gpio.h index 03f616b..85207d2 100644 --- a/include/linux/gpio.h +++ b/include/linux/gpio.h@@ -15,6 +15,12 @@ struct device; /* + * Some code might rely on the declaration. Still, it is illegal + * to dereference it for !GPIOLIB case. + */ +struct gpio_chip; + +/* * Some platforms don't support the GPIO programming interface. * * In case some driver uses it anyway (it should normally have-- 1.7.0.5