linux-kernel - Re: [PATCH 9/9] ARM: mmp: mark usb_dma_mask as __maybe

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Date:	Mon, 22 Feb 2016 23:38:56 +0100
From:	Robert Jarzmik <robert.jarzmik@...e.fr>
To:	Haojian Zhuang <haojian.zhuang@...il.com>,
	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Daniel Mack <daniel@...que.org>,
	Eric Miao <eric.y.miao@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] ARM: mmp: mark usb_dma_mask as __maybe_unused

Arnd Bergmann <arnd@...db.de> writes:

> This variable may be used by some devices that each have their
> on Kconfig symbol, or by none of them, and that causes a build
> warning:
>
> arch/arm/mach-mmp/devices.c:241:12: error: 'usb_dma_mask' defined but not used [-Werror=unused-variable]
>
> Marking it __maybe_unused avoids the warning.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/arm/mach-mmp/devices.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Hi Haojian,

I still didn't get an ack on this one, do you want to carry it through your
tree, or let Arnd carry it or let me carry it ?

Cheers.

--
Robert

[1] The patch
> diff --git a/arch/arm/mach-mmp/devices.c b/arch/arm/mach-mmp/devices.c
> index 3330ac7cfbef..671c7a09ab3d 100644
> --- a/arch/arm/mach-mmp/devices.c
> +++ b/arch/arm/mach-mmp/devices.c
> @@ -238,7 +238,7 @@ void pxa_usb_phy_deinit(void __iomem *phy_reg)
>  #endif
>  
>  #if IS_ENABLED(CONFIG_USB_SUPPORT)
> -static u64 usb_dma_mask = ~(u32)0;
> +static u64 __maybe_unused usb_dma_mask = ~(u32)0;
>  
>  #if IS_ENABLED(CONFIG_USB_MV_UDC)
>  struct resource pxa168_u2o_resources[] = {

-- 
Robert