Commit 015a830d authored Sep 28, 2012 by Arnd Bergmann Committed by John Stultz Sep 28, 2012

time/jiffies: bring back unconditional LATCH definition



Patch a7ea3bbf "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]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>

parent 0bd1189e

include/linux/jiffies.h

+3 −2

Original line number	Diff line number	Diff line
		@@ -51,10 +51,11 @@
		#define SH_DIV(NOM,DEN,LSH) ( (((NOM) / (DEN)) << (LSH)) \
		+ ((((NOM) % (DEN)) << (LSH)) + (DEN) / 2) / (DEN))

		#ifdef CLOCK_TICK_RATE
		/* LATCH is used in the interval timer and ftape setup. */
		#define LATCH ((CLOCK_TICK_RATE + HZ/2) / HZ) /* For divider */

		#ifdef CLOCK_TICK_RATE

		/*
		* HZ is the requested value. However the CLOCK_TICK_RATE may not allow
		* for exactly HZ. So SHIFTED_HZ is high res HZ ("<< 8" is for accuracy)