[PATCH] ARM: fix exynos randconfig build error

[b.zolnierkie@samsung.com (Bartlomiej Zolnierkiewicz)]

Hi,

On Tuesday, March 03, 2015 04:40:02 AM Kukjin Kim wrote:
> On 02/27/15 06:30, Kukjin Kim wrote:
> > On 02/25/15 20:46, Krzysztof Kozlowski wrote:
> >> 2015-02-25 12:26 GMT+01:00 Russell King <rmk+kernel@arm.linux.org.uk>:
> >>> The following error was observed with SMP=n in v4.0-rc1:
> >>>
> >>> arch/arm/mach-exynos/pm.c: In function 'exynos_cpu0_enter_aftr':
> >>> arch/arm/mach-exynos/pm.c:246:4: error: implicit declaration of function 'arch_send_wakeup_ipi_mask' [-Werror=implicit-function-declaration]
> >>>
> >>> As the code unconditionally calls a function only available with SMP=y,
> >>> make the Exynos PM support depend on SMP.
> >>>
> >>> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
> >>
> >> Hi,
> >>
> >> Thanks for the patch but this already waits for Kukjin top be picked
> >> up. The first patch was similar to yours (adds dependency on SMP),
> >> sent on 4th of February:
> >> https://patchwork.ozlabs.org/patch/436231/
> >>
> >> But later Bartlomiej fixed this in other way (allowing to use cpuidle
> >> on non-SMP):
> >> https://patchwork.ozlabs.org/patch/436445/
> >>
> >> Unfortunately none of them were picked up.
> >>
> > I've missed the fix, sorry.
> > 
> > BTW, as you know, all of exynos SoCs are based on SMP so generally (in
> > normal case) there is no reason to use non-SMP on exynos
> > platforms...even though I understand the build error should be fixed...
> > 
> > Anyway, I'll have a look Bart's patch and Russell's fix in this weekend.
> > 
> 
> Firstly, let me take rmk's patch for the randconfig build error...BTW

What is wrong with picking my patch instead?  It is non-invasive and fixes
cpuidle support on UP (which is a regression from previous kernels)?

https://lkml.org/lkml/2015/2/4/521

> I'm still wondering exynos stuff needs to support non-SMP and need to
> think more about its usefulness?...

Currently UP is supported and at least I find it useful for testing/debug
purposes.  If you want to to make Exynos SMP only thats OK but it should
be done globally for Exynos arch support not just for cpuidle support.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics