linux-kernel - Re: [PATCH 12/12] time/jiffies: bring back unconditional LATCH definition

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Date:	Fri, 28 Sep 2012 14:55:22 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arm@...nel.org, Catalin Marinas <catalin.marinas@....com>,
	Richard Cochran <richardcochran@...il.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 12/12] time/jiffies: bring back unconditional LATCH definition

On 09/28/2012 02:36 PM, Arnd Bergmann wrote:
> Patch a7ea3bbf5d "time/jiffies: Allow CLOCK_TICK_RATE to be undefined"
> breaks the compilation of targets that rely on the LATCH definition,
> because of recursive header file inclusion not defining CLOCK_TICK_RATE
> before it is checked here.
>
> This fixes the problem by moving LATCH back to where it was, but it
> seems that there are still cases where SHIFTED_HZ is defined incorrectly
> because of the same problem. Need to investigate further.
>
> Without this patch, building h7201_defconfig results in:
>
> arch/arm/mach-h720x/common.c: In function 'h720x_gettimeoffset':
> arch/arm/mach-h720x/common.c:50:73: error: 'LATCH' undeclared (first use in this function)
> arch/arm/mach-h720x/common.c:50:73: note: each undeclared identifier is reported only once for each function it appears in
> arch/arm/mach-h720x/common.c:51:1: warning: control reaches end of non-void function [-Wreturn-type]

Hrrm. Ok. I had a patch for 3.7 that tried to get rid of the generic 
CLOCK_TICK_RATE derived users, but that may not fly if there's still 
LATCH users around.  I guess I'll tweak it so we keep LATCH around, 
probably by mering your change into my tree.

I suspect the long term fix is to push the LATCH definition up into arch 
specific code that is using it, so it can be made dynamic instead of a 
compile time constant. Otherwise it might be hard to get a unified 
zImage working.  But for now I guess your current fix is good short-term.

thanks
-john

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