linux-kernel - Re: [PATCH] clk: Allow drivers to build if COMPILE

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Date:	Wed, 14 Oct 2015 14:13:51 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	linux-kernel@...r.kernel.org,
	Luis de Bethencourt <luisbg@....samsung.com>,
	Michael Turquette <mturquette@...libre.com>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, linux-clk@...r.kernel.org
Subject: Re: [PATCH] clk: Allow drivers to build if COMPILE_TEST is enabled

On 10/14, Javier Martinez Canillas wrote:
> On 10/14/2015 09:08 PM, Javier Martinez Canillas wrote:
> > Hello Stephen,
> > 
> > On 10/14/2015 08:38 PM, Stephen Boyd wrote:
> >> On 10/13, Javier Martinez Canillas wrote:
> >>> diff --git a/drivers/clk/versatile/Kconfig b/drivers/clk/versatile/Kconfig
> >>> index 1530c9352a76..fc50b6264bed 100644
> >>> --- a/drivers/clk/versatile/Kconfig
> >>> +++ b/drivers/clk/versatile/Kconfig
> >>> @@ -1,6 +1,6 @@
> >>>  config COMMON_CLK_VERSATILE
> >>>  	bool "Clock driver for ARM Reference designs"
> >>> -	depends on ARCH_INTEGRATOR || ARCH_REALVIEW || ARCH_VEXPRESS || ARM64
> >>> +	depends on ARCH_INTEGRATOR || ARCH_REALVIEW || ARCH_VEXPRESS || ARM64 || COMPILE_TEST
> >>
> >> Have you compiled these drivers on an architecture that doesn't
> >> have IOMEM? Perhaps tile or um? I'm all for more build coverage,
> >> but it's not always as simple as just sprinkling some
> >> COMPILE_TEST around the Kconfigs.
> >>
> > 
> > No, I only build tested on arm32 and x86. The 0-day bot haven't reported a
> > build error yet and I didn't see any platform dependent code in the drivers.
> > 
> 
> BTW, all clk drivers depends on COMMON_CLK so these won't even be built in
> tile or um since that symbol isn't selected there. Or did I misunderstand?
> 
> Having said that, I see that enabling COMPILE_TEST will attempt to build
> in many archs [0] that I don't have a toolchain to test. So I'm OK if you
> drop this patch and sorry for the inconvenience.
> 
> [0]:
> $ git grep "select COMMON_CLK" arch/ | cut -d '/' -f2 | uniq 
> arc
> arm
> arm64
> h8300
> microblaze
> mips
> powerpc
> x86
> xtensa
> 

Ah that's good. So assuming someone has built these patches with
these architectures then we've got it all covered. Do you know if
kbuild does that? There are a bunch of cross compilers on
kernel.org that may help[1]. I'll wait to apply the patch once we
get that confirmation.

[1] https://www.kernel.org/pub/tools/crosstool/

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