linux-kernel - Re: [PATCH] mfd: vexpress: add !ARCH_USES

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Date:	Sat, 30 Apr 2016 13:47:37 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Lee Jones <lee.jones@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd: vexpress: add !ARCH_USES_GETTIMEOFFSET dependency

On Wed, Apr 27, 2016 at 7:49 PM, Arnd Bergmann <arnd@...db.de> wrote:

> The MFD_VEXPRESS_SYSREG driver selects CLKSRC_MMIO, which in turn
> conflicts with ARCH_USES_GETTIMEOFFSET, causing a harmless Kconfig
> warning when it is set:
>
> warning: (ARCH_MVEBU && ARCH_DIGICOLOR && ARCH_GEMINI && ARCH_KEYSTONE && ARCH_MOXART && ARCH_MXS && PLAT_SPEAR && ARCH_SUNXI && ARCH_TEGRA && ARCH_U300 && PLAT_ORION && ARCH_CLPS711X && ARCH_EP93XX && ARCH_NETX && ARCH_IXP4XX && ARCH_KS8695 && ARCH_W90X900 && ARCH_PXA && ARCH_SA1100 && ARCH_OMAP1 && ARCH_BCM_IPROC && ARCH_INTEGRATOR_AP && ARCH_OMAP2PLUS && MFD_VEXPRESS_SYSREG) selects CLKSRC_MMIO which has unmet direct dependencies (!ARCH_USES_GETTIMEOFFSET)
>
> This was apparently hidden by the fact that no ARM platform that
> still sets ARCH_USES_GETTIMEOFFSET has gpiolib support, and we
> already have a dependency on GPIOLIB that I added a while ago.
>
> However, after 296ad4acb8ef ("gpio: remove deps on
> ARCH_[WANT_OPTIONAL|REQUIRE]_GPIOLIB"), any platform can enable
> CONFIG_GPIOLIB, and that lets us enable MFD_VEXPRESS_SYSREG
> as well.
>
> This adds an explicit dependency on !ARCH_USES_GETTIMEOFFSET
> to guarantee that we can enable the CLKSRC_MMIO driver without
> getting warnings.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

OMG that was complex, thanks for explaining.

I am officially impress by your Kconfig ninja skills.

Acked-by: Linus Walleij <linus.walleij@...aro.org>

Lee, please pick this up?

Yours,
Linus Walleij