arm64 defconfig breakage (gpio) in next-20130218

[Shawn Guo]

On Mon, Feb 18, 2013 at 11:14:10AM +0000, Mark Rutland wrote:
> Hello,
> 
> When I attempt to build a defconfig arm64 kernel from next-20130218, it fails
> with the following complaints from gcc:
> 
> In file included from include/linux/gpio.h:48:0,
>                  from drivers/gpio/devres.c:18:
> include/asm-generic/gpio.h: In function ‘gpio_get_value_cansleep’:
> include/asm-generic/gpio.h:270:2: error: implicit declaration of function ‘__gpio_get_value’ [-Werror=implicit-function-declaration]
> include/asm-generic/gpio.h: In function ‘gpio_set_value_cansleep’:
> include/asm-generic/gpio.h:276:2: error: implicit declaration of function ‘__gpio_set_value’ [-Werror=implicit-function-declaration]
> In file included from drivers/gpio/devres.c:18:0:
> include/linux/gpio.h: At top level:
> include/linux/gpio.h:60:19: error: redefinition of ‘gpio_cansleep’
> In file included from include/linux/gpio.h:48:0,
>                  from drivers/gpio/devres.c:18:
> include/asm-generic/gpio.h:262:19: note: previous definition of ‘gpio_cansleep’ was here
> In file included from drivers/gpio/devres.c:18:0:
> include/linux/gpio.h: In function ‘gpio_cansleep’:
> include/linux/gpio.h:62:2: error: implicit declaration of function ‘__gpio_cansleep’ [-Werror=implicit-function-declaration]
> include/linux/gpio.h: In function ‘gpio_to_irq’:
> include/linux/gpio.h:67:2: error: implicit declaration of function ‘__gpio_to_irq’ [-Werror=implicit-function-declaration]
> drivers/gpio/devres.c: In function ‘devm_gpio_release’:
> drivers/gpio/devres.c:26:2: error: implicit declaration of function ‘gpio_free’ [-Werror=implicit-function-declaration]
> drivers/gpio/devres.c: In function ‘devm_gpio_request’:
> drivers/gpio/devres.c:60:2: error: implicit declaration of function ‘gpio_request’ [-Werror=implicit-function-declaration]
> drivers/gpio/devres.c: In function ‘devm_gpio_request_one’:
> drivers/gpio/devres.c:90:2: error: implicit declaration of function ‘gpio_request_one’ [-Werror=implicit-function-declaration]
> cc1: some warnings being treated as errors
> make[2]: *** [drivers/gpio/devres.o] Error 1
> make[1]: *** [drivers/gpio] Error 2
> 
> I've bisected this down to 0fa2fd9a0d: "Merge branch 'linusw/devel' of
> git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git into
> gpio/next". Both parent commits build fine.
> 
> I've played around a bit, and selecting ARCH_REQUIRE_GPIOLIB in the arm64
> Kconfig fixes the issue, but I'm unfamilar with gpio{,lib} and I'm not sure
> that's the best/correct way of solving this.

Kconfig GENERIC_GPIO is designed as an option defined at architecture
level and select by platform who knows how gpio driver/API is
implemented.  The following change should fix the error.

Shawn

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index f532ce5..aca4a25 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -93,7 +93,7 @@ config IOMMU_HELPER
        def_bool SWIOTLB

 config GENERIC_GPIO
-       def_bool y
+       bool

 source "init/Kconfig"