linux-kernel - Re: [PULL] clockevents: a couple of fixes for tip/timers/urgent

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Date:	Fri, 7 Aug 2015 09:19:47 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PULL] clockevents: a couple of fixes for tip/timers/urgent


* Daniel Lezcano <daniel.lezcano@...aro.org> wrote:

> 
> Hi Ingo,
> 
> this pull request contains the following changes:
> 
>  - Prevented to suspend or resume the sh_cmt clocksource when this one is
> not enabled (Geert Uytterhoeven)
>  - Improved build coverage with COMPILE_TEST for the stm32 timer (Maxime
> Coquelin)
> 
> Thanks !
> 
>   -- Daniel
> 
> The following changes since commit 0f44705175347ec96935d60b765b5d14ecc763bb:
> 
>   tick: Move the export of tick_broadcast_oneshot_control to the proper
> place (2015-07-14 12:01:04 +0200)
> 
> are available in the git repository at:
> 
>   http://git.linaro.org/people/daniel.lezcano/linux.git
> clockevents/4.2-fixes
> 
> for you to fetch changes up to 1822a48be12f7ce2799d3423e49b967896794c4d:
> 
>   clockevents/drivers/sh_cmt: Only perform clocksource suspend/resume if
> enabled (2015-08-06 17:17:20 +0200)
> 
> ----------------------------------------------------------------
> Geert Uytterhoeven (1):
>       clockevents/drivers/sh_cmt: Only perform clocksource suspend/resume if
> enabled
> 
> Maxime Coquelin (1):
>       clockevents/drivers/timer-stm32: Improve dependencies of timer-stm32
> 
>  drivers/clocksource/Kconfig  | 4 ++--

Hm, so why is this an urgent fix, i.e. a regression fix? It appears to widen build 
coverage:

 config CLKSRC_STM32
-       bool "Clocksource for STM32 SoCs" if !ARCH_STM32
-       depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST)
+       bool "Clocksource for STM32 SoCs" if COMPILE_TEST
+       depends on OF && GENERIC_CLOCKEVENTS

that can at most introduce build regressions - not fix anything.

If there's any other purpose of this change it's not mentioned in the changelog.

Also, I think the change is broken to begin with:

+       bool "Clocksource for STM32 SoCs" if COMPILE_TEST

this will turn off the driver even in its target platform!

The right way to increase testing this way is via:

	depends on ... || COMPILE_TEST

Thanks,

	Ingo
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